Develop Bugs

Upgraded to WM2003SE, no power from external battery.

Hello -
I'm having an odd problem. Even more odd is the fact that I can't seem to find a single post from anyone experiencing the same symptoms. I recently upgraded my HTC PPC phone to the WM2003SE Special Edition ROM (And have tried a custom cooked SE ROM as well), and am noticing that ever since, for whatever reason, the pda is no longer using power from the external/extended battery. The power settings screen shows that the add-on battery is recognized, and when in the cradle, it shows that both batteries are being charged normally. However, when the unit is undocked, only the main (internal) battery seems to deplete (and my battery life is obviously significantly shorter than it was pre-upgrade). The extended battery shows 100% charge, even after hours of use.
Is this a known issue with 2003SE? Is there some utility or (registry) setting that's required to enable the unit to draw power from the external battery when running SE? Any help is much appreciated, as I love WM2003SE, and am really dreading going back to an older ROM. Thanks in advance for any assistance.

the extended battery is a reserve of your main battery used to protect your data when the main battery depletes ...
Theres no way (at least i think) to "enable" the extended battery for normal use.
It kicks in when the main battery reaches 0% and last for 72Hours but you cannot use the PDA in this time, its only there to retain data.

If I hadn't been using this pocket pc for over a year now, I might accept that answer. But in previous OS versions, that's simply not how it functioned. For clarification, I'm talking about the piggy-back extended battery, not a 'backup battery'. It extended the life of my pocket pc by well over 100% and the meters would show it depleting alongside the main, internal battery, not sitting at 100% as it seems to do now. The battery life of my pocket pc is now literally 40% of what it was pre-upgrade.
I do appreciate your response though. Any other thoughts? Any other people experiencing anything similar?

Hi, i may be assuming the wrong thing but to be clear ive attached a picture of what i mean.
Sorry if its not the same as you describe.

He is referring to the additional clip on battery not the backup battery. I cant understand why it doesnt work correctly, I thought it was a straightforward electrical connection that needed no driver or registry entries. I think you will need to flash back to original rom to see if this is a hardware or software problem.

Cruisin' is correct. And yeah, that's pretty much what I was thinking would be the next step (downgrading and testing to ensure it's not the hardware) assuming I saw no obvious answer here. Thanks, cruisin. I'll post my findings when I get the time to test with a previous ROM.
And thanks to you too, danny, for trying to help out.

sorry for maybe my silly questions.
anybody know how to connect external battery? I want to say complete wiring diagram between phone and external battery.maybe I can try to emulate external battery with some high capacity accumulators like 4XR20 (4xA size in other standard).other solution is to charge PPC from that external device,or maybe better to have dual function switcheable,external battery or charger.
any info or documentation is wellcome.

Are the external monitor and CF card slot features on your backpack working properly with SE?
If not, I bet there are backpack drivers contained in the original Himalaya ROM that are missing from the new one. The SE ROM, after all, was derived by modifying a version taken from a different device and adapted for the Himalaya. The backpack is Himalaya specific.
This is of interest to me because I currently use the excellent Diamond ROM and have been thinking of adding a backack for presentations.
Perhaps one of the gurus could help?

RE
Hi!
I'm using my 3rd backpack now for my O2 XDAII WM2003SE.
There's no need of any backpack driver if you upgrade from WM2003 to WM2003SE.
Secondly, you can't change anything in the main ROM AFAIK. However, for the EXTROM there's no backpack driver required.
Thirdly, the backpack battery lifespan is pretty short as compared to the main battery since during usage the backpack battery will reach zero first. Hence, it won't be surprise that the backpack battery can be charged to 100% and then reaches zero after a short use as compared to normal usage. This is a sign of impending end of life of your backpack battery.
How long have you purchase your backpack? If you charge your O2 with your backpack daily (after the backpack battery reaches zero) then likely that tha backpack battery will not last 365 charges i.e. a full year.
Otherwise, it could be sign a of faulty backpack. My first backpack failed after a few weeks of normal usage. My 2nd backpack failed after nearly a year of normal usage.
I suggest, if possible, take another backpack and test to see whether ist your backpack thats giving the problem or do a hard reset and re-install your OS again.

BA vs TyTn, Wizard, etc

Im looking to purchase a new PDA/Phone and I stumbled across the XDA 02 ii2 and thought despite it's age, that it would be an impressive upgrade from my Wizard.
By specs alone the BA should still be a formidable phone in terms of RAM, CPU, speed, etc.
Not to mention it boasts a pretty impressive 3.5" screen, though its resolution isnt better, its size makes it very useful as a portable media player as well.
Is its CPU inferior to the Dual core CPUs of the Wizard, or the 400mhz of the tytn? How much faster does having 128MB RAM make it compared to its newer peers?
Is it worth purchasing now as a usable device (esp considering its low low price)? And are there any major concerns about its stability, function, etc?
And Ive read about how to make it WM5, but what stops it from running WM6 other than unofficial ROM support?
Thank you!

The fact that the Wizard has two processor cores means nothing. One core is used for running operating system and the other one is GSM radio processor. In Blue Angel and Hermes (TyTN) it is present in separate chip.
The 400MHz PXA263 XScale processor in Blue Angel is far superior then Wizard's OMAP in terms of raw processing power. However this is not cruicial for most apps (expect: heavy games, Skype, some heavier navigation apps). If you use one of the latest ROMs on Wizard it should be much faster most of the time than Blue Angel, because of Blue Angels very slow flash ROM (even its SDIO slot is alot faster). More memory is great advantage for WM2003SE but in case of WM5 I think it doesn't make for its greater power consumption. Of course it is great for some resource-heavy apps.
Blue Angel:
+ Fast processor
+ It is crowded with application buttons (there are 9 of them + Green, Red and volume slider)
+ SDIO slot (not microSD or MiniSD)
+ Big display (great for one handed operation in WM5)
+ QWERTY keboard
+ Very good ergonomics (I think best among all Pocket PCs)
- Lower battery life than competition
- Not the best QWERTY keyboard under the sun
- Occasional instability
- Doesn't have EDGE
- Low range of Bluetooth and WiFi
Wizard
+ Stable
+ Small
+ Very good battery life
+ Fast for everyday use with latest ROMs
+ Good QWERTY keyboard
- Small display
- Thick
- Only few application buttons
- Slow processor
- Bad ergonomics
Hermes
+ Fast
+ Stable
+ Acceptable battery life
+ Good ergonomics
+ Very good QWERTY keyboard
- Small display
- Not very cheap

Thank you! thats exactly what I was looking for.
The size of the screen is what's really appealing to me, and I dont see the newer models attempting to match it with the exception of the o2 Flame (but pre orders for that phone are in the $1,000 USD range).

I would go for the Tytn; it is a great device and I find it much faster than my BA, much more stable, better battery life, better connectivity, better keyboard, a load more features and in my opinion is the better device. I know the screen is small but in day-to-day operations it really is no problem.

I may agree to a point with PPCnut, but tryin playing with Morphgear or Playstation emulator on it and push the envelop. you will see the BA
is actually faster and performs better under pressure. or look up GX benchmark for pocket pc, the BAs scores higher in most of the tests of speed
then the TYTN/ Hermes
I know i have both

How does the Kaiser / Tytn II compare in this example?
Currently have a BA still (Actually have two of them) but am very seriously tempted by the Kaiser.
I may actually be interested in selling them - two BAs (one without stylus or battery), two cradles, a car sucker mount and a minisync retracting sync/charge cable.
Why do I have two? I thought it was faulty and my carrier sent out a replacement - it turned out the battery was faulty not the handset. I "failed" to send the other one back and they failed to ask for it That was many years ago, I doubt they will ever ask...
Interested and in the UK coyote? May be hard to get a new one now and a 2nd hand one with a unit for spares should you have an accident may be handy

How to disable USB Charging in Hermes WM6

Hi
I have upgraded my Dopod 838pro from WM5 to WM6 with the official ROM from HTC.
I connect my 838pro frequently using USB cable to my desktop to surf the net. In order not to ruin my battery, I disable the USB charging feature in WM5 (under the power ->advanced tab).
However, after I upgraded to WM6, this feature is lost. I tried the registry hack for WM5 but it didnt work for me in WM6.
Can someone help to let me know how can I disable USB charging in WM6? Thanks a million.

Why do you care? A brand new battery is around 10-20 bucks in ebay. I have been charging with usb for the last 4 months and didn't observe any significant battery life drop. I wouldn't mind buying a new battery for $15 every 2 years.
I would be changing my tytn in 2 years anyway.

I have been charging my previous battery frequently and it last only 5 hours from 100% to 10% with minimum usage now. That battery is only 1 year old. I have just bought a new battery and hence would like to preserve it abit longer until I have found my next good phone

Plenty of people have reported batteries going down quicker with certain ROMs, especially dependent on the radio version. Is it possible your battery is not the problem? Is the new battery definitely better?
When the light turns green it's stopped charging, so shouldn't overcharge. Li-ion batteries don't have memory problems.

gregnash said:
Plenty of people have reported batteries going down quicker with certain ROMs, especially dependent on the radio version. Is it possible your battery is not the problem? Is the new battery definitely better?
When the light turns green it's stopped charging, so shouldn't overcharge. Li-ion batteries don't have memory problems.
Click to expand...
Click to collapse
It's not memory problems that these batteries develop. It's more that they have a certain number of charge cycles before their performance degrades. Most Li-ions I believe are rated to about 500 cycles tops before the battery life drops below 80%. So every time you plug it into the computer it would kind of count as a cycle. So a large amount of charge cycles and these batteries will degrade much quicker than normal.

Since 1 year I allways connect and charge nearly every day my little toy via USB. Never had battery drop. Even now with the new Radio and WM6 its works much longer as before.

gregnash said:
Plenty of people have reported batteries going down quicker with certain ROMs, especially dependent on the radio version. Is it possible your battery is not the problem? Is the new battery definitely better?
When the light turns green it's stopped charging, so shouldn't overcharge. Li-ion batteries don't have memory problems.
Click to expand...
Click to collapse
I second that. It sounds more like a rom problem than a battery problem. After
all, there are people (including me) who keep charging via USB and don't
experience battery problems.

The last 4 months I've only charged my device with the USB connection and have no battery problems.
BTW: There is no way to turn the USB charging off, unless u cut some wires & remove some pins. see prior thread discussion:
http://forum.xda-developers.com/showthread.php?t=273344

I charge my phone like a million times a day it seems. Between car charger, home charger, usb from my pc. It gets plugged into things at least 3 times a day if not a lot more when I'm at home messing with stuff on it while its plugged into the pc. Battery works just as good as it did when I got the phone over a year ago. And working in the cell phone industry for years I still say that this phones battery life is amazing compared to most other phones. Even a year later this battery seems to last longer than any other pda battery especially considering all the things I do with it. ie: gps/irc/streaming audio/video via orb/talking on the phone with the woman. Can usually go 2 days of avg usage doing all that providing hsdpa is disabled. Once I turn on hsdpa I get almost a full day of avg usage.
Edit: All that being said, seems like a big waste of time worrying about disabling charging over usb considering how cheap a new battery is and how little a impact it seems to make anyway considering other peoples testimonials. Just my 2 cents.

Found this in Hermes Wiki:
Disable charging when connected to USB
Registry entry to control USB charging:
[HKLM\\Drivers\BuiltIn\Battery\EnableUSBCharging]
if EnableUSBCharging = 1 --> Phone will be charged when connected to a USB power (laptop, etc.)
if EnableUSBCharging = 0 --> Phone will not be charged
I have not yet tried this myself though.
Source

Li-ion Batteries
I was doing some research about Li-ion batteries and came across this info - How to prolong lithium-based batteries.
Seems like the more you charge them and not totally discharge them the better.
Sogam

I have a DOPOD 838Pro which I upgraded to WM6.0 as well. The battery issue is well documented and has less to do with cycles or memory effect than it has to do with your settings. Upon upgrading from WM5.0, I noticed that the backlight setting for "on battery" was reset to half way. I normally used it on the leftmost side turning the display readable indoors. There is no point in setting the backlight to the maximum or even to the middle, as the screen provides poor reading outdoors anyway.
In my experience it increased my battery life between 25 to 35% taking an average working day, i.e. average number of hours on the phone.
Cheers

You can get a replacement battery here for only $7.29 shipped. Shipping takes about 2 weeks though but cheap.

Only had my Hermes a few weeks, but I've owned Compaq/HP IPAQ's for the last 6+ years. They always said in the manuals it was best to keep the device connected/charging as often as possible. Out of those devices I have only replaced batteries once for each device over the years, so I think it works well. My Hermes gets connected to my desktop at home and work most of the time, though I admit since its a phone and has better battery life then my Ipaqs I do connect is a bit less often.
That said, as others have written, batteris are cheap and unlike Apple devices, user replaceable. Thank you HTC!

KarhU said:
Found this in Hermes Wiki:
Disable charging when connected to USB
Registry entry to control USB charging:
[HKLM\\Drivers\BuiltIn\Battery\EnableUSBCharging]
if EnableUSBCharging = 1 --> Phone will be charged when connected to a USB power (laptop, etc.)
if EnableUSBCharging = 0 --> Phone will not be charged
I have not yet tried this myself though.
Source
Click to expand...
Click to collapse
Thanks alot for that. I needed it. My laptop used to charge when i connect my HTC Touch Pro, but then it stopped. I changed the registry you listed and it charges again.

What Do You Consider 'Good' Battery Life?

NOTE: Fourth Option Should Read 16-24 Hours of LIGHT Use!
I see a lot of people constantly talking about battery life on here and how they are disappointed by what they are seeing from ROMs, kernels, or the OTA release.
I'm interested to see exactly what sort of expectations people have on the lifetime of their phone.
I've been fairly cognizant of my phone's power consumption and have done a lot to ensure I understand how I use it and what effect that has on its life between charges.
I understand that a first generation phone with the largest screen, the fastest processor available, the most processor intensive camera, with animated wallpapers, synchronization to various web services, flash, and borderline experimental next-generation wireless connectivity that can tether to multiple devices. To have all that on a unit marginally larger than my old Palm Pre and roughly the same battery size (1150mAh stock) is going to come with some compromises.
I tend to overclock, ROM flash, and beat the snot out of my phone on a regular basis. Therefore, I have a super gigantic Seidio battery that I absolutely adore. I found that even before that, I was able to get my battery life under control if I controlled my phone properly, so I'm not sure what the problem is.
Did some people just get bad phones? Are some people just being unrealistic with their expectations? What goals do you think people should be setting for the lifetime of their phone between charges?
Its an honest question.

I used to get almost a week out of an old motorola flip style phone (v500 something).
Everything since then has been downhill.

I'm not under the false impression that these new phones are going to last as long as the older "dumb" phones, BUT.....Id like to be able to get through the day without charging my phone. I keep my screen about 40% brightness, I'm usually in an area with good reception, I only sync my Gmail, I've calibrated my battery, etc. The only real USE my phone gets is texting. I unplug my phone at 5am and its more than half gone by noon. Not real great IMO.

I think this will provide valuable insight as to expectations for this phone. Personally I have used smartphones since I can remember and I was bread to expect a nightly charge.

It may be unacceptable to some that we have to "mod" our phones to get reasonable battery life, but I really dont have too many complaints. Out of the box, the EVO is running a 1gz processor and powering a 4.3" display. Not to mention if you're running wifi and various apps. I think some people are just expecting too much from these phones. Look at laptops. When my dell was brand new, I could get 2-3 hours of steady use before it conked out. The battery life our phones are getting, modded or stock, isnt really that bad. If you're unwilling to do some research and easy mods or buy a spare $20 OEM battery off eBay please dont complain about it.

spiicytuna said:
I think this will provide valuable insight as to expectations for this phone. Personally I have used smartphones since I can remember and I was bread to expect a nightly charge.
Click to expand...
Click to collapse
A nightly charge is acceptable. It's when you have to charge 2-3 times a day from moderate usage that is a little out of hand... Understandable that with heavier usage, more frequent charges would be needed.

Wat kernel is best for saving battery life.. i use CM6 NB
Sent from my PC36100 using XDA App

Skeptron said:
Wat kernel is best for saving battery life.. i use CM6 NB
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
Off Topic.

I want to power a small village from my phone please

I want my phone to last a day. And call a typical day something like:
- l/2-1 hour talk
- 12-24 text messages
- 45 minutes - 2 hours web browsing
- 2 hours music
My iPhone 3GS would do this without a problem, my wife's iPhone 4 might do 2 days like this. The EVO just barely does this.
But.. I prefer the EVO for enough reasons I just dropped $10 for 2 extra batteries and a phone-less charger on ebay, and keep chargers in the car and at my desk, and get it plugged in for like 30 minutes somewhere during the day. I rarely use the backup batteries, but it is nice to have them.
Totally worth it for a bigger screen, 4G, more open OS.

laydros said:
I want my phone to last a day. And call a typical day something like:
- l/2-1 hour talk
- 12-24 text messages
- 45 minutes - 2 hours web browsing
- 2 hours music
My iPhone 3GS would do this without a problem, my wife's iPhone 4 might do 2 days like this. The EVO just barely does this.
But.. I prefer the EVO for enough reasons I just dropped $10 for 2 extra batteries and a phone-less charger on ebay, and keep chargers in the car and at my desk, and get it plugged in for like 30 minutes somewhere during the day. I rarely use the backup batteries, but it is nice to have them.
Totally worth it for a bigger screen, 4G, more open OS.
Click to expand...
Click to collapse
This definitely sounds doable. If you aren't getting that out of your phone, I'd reccomend calling support. I'm going to assume your dedication has already lead you down your own troubleshooting path.

My standard was set with my BlackBerry: less than 5% discharge rate per hour under normal use, and I am happy.
-------------
Sent from my HTC EVO 4G using Tapatalk Pro.

HTC HD7 , whopping 3.5 hours 3G usage on 50% charge today!

running Mango RTM:
today i changed my old sim card to a new one
the old one is a iphone 3G sim card ( smaller gold plate)
the new one ( seems bigger gold plate)
and i got this
6PM - 9PM on 50 % charge continousl surfing web on browser on 3G.
THis is something i never had even on nodo...
can someone explain?

anyway found something here which may explain it
http://forums.precentral.net/palm-pre-pre-plus/266015-micro-sim-causing-extra-battery-drain.html
seems my old sim which was used on the iphone 3G is trying to identify the HD7 as an iphone?

I'm confused...what are you asking?

How is this possible? Hd7 not supposed to last more than 3hours on full charge

Magpir said:
How is this possible? Hd7 not supposed to last more than 3hours on full charge
Click to expand...
Click to collapse
I don't get it either... is this a sarcastic thread?
I don't have an HD7, but the phone I have usually lasts the entire day. Slightly less if I stream youtube for my 45 min commute to work.

I can easily do the test over Mango tomorrow.
I have HD7 with T-Mobile HSDPA.
But during the work i have done over my mango HD7, look like the HD7 has slightly more battery time after the firmware update from HTC, and also the new features / tweak from Mango.
I mean, when i was on Nodo, my Schubert usually died after about 8 hours of Light Surfing in class for research, and a little apps around it.
From 7h in the morning to 2, 2h30PM, and most of the time i could not finish my work before my phone died.
After Mango, i feel there are something really different with Nodo. School works increase by times, i do more searching stuffs on the phone than ever before, like 50% more, 3G like all the time, from IE, to Amazon Kindle, Adobe Reader... and my Schubert even last longer than Nodo Standard about 30-40 mins.
My settings almost are default, Remember Location = On, Push mail = On, Automatic Find Updates = On, Auto Update Social Network = on.
I will go out tomorrow and give a little more detail on Mango battery Juice.

Like Magpir said, it probably had more to do with switching SIM cards. Although Mango probably helped a little.
I saw the same when I switched cards. The guy who switched it out for me told me that the old cards were inefficient in staying locked on to the 3g network. My phone would continually switch between 3g and 2g which drains the battery much quicker.

I can generally get about 3.5 to 4 hours out of my Arrive over 3G and this is with streaming music. it all depends on the signal strength, if it's really strong the phonewont use any extra energy to decode the signals from the towers. if there is a weak signal or a busted tower then the phone will try its best to retain the signal and transfer data which can cause overheating and rapid battery drain. I can share my experience with this as the tower in my hometown's busted so my speeds are slow and my battery doesn't even last 2 hours in this case.

Not surprising really. Battery life on 7720.68 (HD7) improved significantly after using the built-in Connection Setup app. I saw this tip in another thread and can verify it worked on my HD7. Yesterday I went from 5:30am to 11pm on a single charge with exchange pushmail(as items arrive), wifi and bluetooth always on and 3G (Taiwan GSM), 30 minutes gps logging, 30 minutes web browsing, 60 minutes zune and 15 minutes talk time. Battery is stock and already 7-months old. MS & HTC got this one right -- I think WP7 has a very bright future. Cheers

My point is I was heavily using it, for 3 hours straight at 50% charge, surfing web and chatting on msn.
Also discovered that there is a flaw in the charging process, not sure if it's related to mango or the phone battery / hardware.
I noticed that after every full charge, I need to soft reset each time for the battery not to drain.

Anyway I tested the phone in different areas within a 5 km radius

lbp775 said:
Like Magpir said, it probably had more to do with switching SIM cards. Although Mango probably helped a little.
I saw the same when I switched cards. The guy who switched it out for me told me that the old cards were inefficient in staying locked on to the 3g network. My phone would continually switch between 3g and 2g which drains the battery much quicker.
Click to expand...
Click to collapse
which is why whenever u get a new phone , its always best to get a new sim card.

Magpir said:
which is why whenever u get a new phone , its always best to get a new sim card.
Click to expand...
Click to collapse
Hmm now I wonder if my SIM card has issues. I always believed that there is something wrong with the 2g to 3g switching.
At first I believed that it is just bad code by MS.
I tested it by traveling through half of the country and the battery died in just half a day.
I have also noticed that the Samsung Network app recognized one of my SIMs as a contract when it should be a pay as you go card. (it was originally a contract card)
Might head down to vodafone to get myself a new one.

I have my hd7 with an extra battery pack which is spposely make the phone last x2 more than normal and it only makes it through 8 hours a day most time and if am lucky it makes it to 10 hours.. Anyone knows why
Sent from my HD7} using XDA Windows Phone 7 App

oswald-josh said:
I have my hd7 with an extra battery pack which is spposely make the phone last x2 more than normal and it only makes it through 8 hours a day most time and if am lucky it makes it to 10 hours.. Anyone knows why
Sent from my HD7} using XDA Windows Phone 7 App
Click to expand...
Click to collapse
Change yr sim card......

interesting.. i wonder how long your battery will last.
im not sure about the HD7, but my optimus 7 comes with Li-ion batteries. the way you use ur phone is killing it.
dont get me wrong, its alright to use it that way, but the thing about li-ion batteries, once you drain it, you can never get it back to 100% charge.
Li-Ion requires frequent charging, even if its only half. NEVER NEVER let it go to dangerous levels, you may not be able to recover back to 100% charge.
search the net and search for the characteristics of li-ion batteries.
there is a popular believe among malaysians & singaporean gadget users, (not sure about people elsewhere), that it is better to drain the battery before charging (some earlier siemens phones have the option to 'drain' battery before charging). That is meant for NiMH batteries to get rid of the 'memory effect'.
Li-ion batteries does not have the memory effect.
charge your phone more frequently, especially with your usage. you will gain more from the battery..

vash_h said:
interesting.. i wonder how long your battery will last.
im not sure about the HD7, but my optimus 7 comes with Li-ion batteries. the way you use ur phone is killing it.
dont get me wrong, its alright to use it that way, but the thing about li-ion batteries, once you drain it, you can never get it back to 100% charge.
Li-Ion requires frequent charging, even if its only half. NEVER NEVER let it go to dangerous levels, you may not be able to recover back to 100% charge.
search the net and search for the characteristics of li-ion batteries.
there is a popular believe among malaysians & singaporean gadget users, (not sure about people elsewhere), that it is better to drain the battery before charging (some earlier siemens phones have the option to 'drain' battery before charging). That is meant for NiMH batteries to get rid of the 'memory effect'.
Li-ion batteries does not have the memory effect.
charge your phone more frequently, especially with your usage. you will gain more from the battery..
Click to expand...
Click to collapse
u can drain the battery to empty but u must immediately recharge it...
an empty L-ION damages when its kept in fully discharged state at long periods of time.

oswald-josh said:
I have my hd7 with an extra battery pack which is spposely make the phone last x2 more than normal and it only makes it through 8 hours a day most time and if am lucky it makes it to 10 hours.. Anyone knows why
Sent from my HD7} using XDA Windows Phone 7 App
Click to expand...
Click to collapse
i can see this few causes.
1) battery not calibrated, damaged or worn out. Have a check in the service centre,
2) old/unoptimised/ worn out / faulty sim card or APn settings ( this is the biggest culprit in smartphones). U have to change yr sim card every 2 years . this will ensure u have the newest network technologies go hand in hand with OS updates or firmware updates for yr phone . APN settings is another reason, setting the wrong apn settings could lead to battery drain.. another thing is do not use sim card meant for another phone ( example iphone 3G) and use it on wp7 phone ..
They may be configured differently work with the OS and not necessarily optimised for another phone's OS and although it may work, I have experienced his myself when i used th my older iphone 3g sim card in my wp7 phone. Result was battery drain. So always use a newer sim card when u are changing phones,
3) features like location, wifi ect., xbox live, auto upload to facebook accounts, push email...turn them off when not needed

aquanaut88 said:
Not surprising really. Battery life on 7720.68 (HD7) improved significantly after using the built-in Connection Setup app. I saw this tip in another thread and can verify it worked on my HD7. Yesterday I went from 5:30am to 11pm on a single charge with exchange pushmail(as items arrive), wifi and bluetooth always on and 3G (Taiwan GSM), 30 minutes gps logging, 30 minutes web browsing, 60 minutes zune and 15 minutes talk time. Battery is stock and already 7-months old. MS & HTC got this one right -- I think WP7 has a very bright future. Cheers
Click to expand...
Click to collapse
think 2 factors increased yr battery life
connection setup - It has been updated 2 times in the marketplace, so i believe there will be some optimisations . i believe it does something more than the wp7 cellular options
push email "as items arrive" . its microsoft's newest push technology called direct push which supposedly saves battery life.. "as items arrive" is direct push technology

Mango has background tasks, push notifications and live tiles that aren't as volatile, etc.
There's a lot more going on in the background, and a lot more 3G usage going on in the background as well.
Really, it was just foolish for HTC to put a phone out with such a small battery. They had issues with the HD2's small battery (basically same phone) as well as the Evo4G and several of their other phones. They needed to put at least a 1500 mAh battery in this thing.
You can't really expect good battery life out of this phone, especially come Mango.
8 hours is pretty bad, adn that's about the most I can get in NoDo with light usage. I thought my Vibrant's battery was bad. It runs circles around this (though it's gotten more updates, so perhaps more issues were fixed).
Also, WP7 doesn't have an easily accessible GPS toggle so a lot of people (esp those on NoDo) are using phones wiht GPS enabled practically all the time. Might wanna turn that off. It will add about an hour or more to your battery life.
In either case I cannot get through a full day of below moderate to moderate use on this phone. The battery is just too small.
My mom got hte 4.3" new HTC Android on AT&T one of the 4G HSPA+ phones I forget hte name (it's similar to the Samsung so I get them confused) and she doesn't have an issue getting through a day. The battery is much bigger, though... So I blame the battery
Excuse the rambling.