Develop Bugs

Charging time

How long does your Desire take to charge? Mine takes ages, gone up 40% in 2 hours, which is exactly the same as the discharge rate when I'm using it. I'm sure my Blackstone used to top up much quicker than that. More and more I think power management is screwy in this device.

Are you using the original charger and cable?
I used a different cable with the original cable a few days ago and after about 6 hours it had only partially charged. Using the original cable it does a complete charge in about 3 hours.

if u use usb charging, it takes very long, but should be done in around 5 hours as well. if its ac adapter, much quicker, about 2 ~ 3 hours.
Sent from my HTC Desire using the XDA mobile application powered by Tapatalk

AC-Adapter:
15% to 100% (15% = "Warning") : ~90mins
0% to 100%: ~2hrs
With USB I think you can (at least) double that time.

Mine currently has been on charge for over 3 hours from about 9% and this is via AC with the phone turned off. I should note that it is via AC through an ipod/iphone charger which is rated at 5v @ 1A so I guess I'm just a little concerned if the ipod/iphone charger is maybe charging it at 500mA instead of 1A.
I know it's not faulty as it charges my ipod touch much faster than pc USB, but I'm just wondering if the cable supplied on my desire is forcing it to charge at 500mA, thinking the ipod charger is just a pc usb thingy.
I'll look into getting a travel adaptor or a brandless micro usb charger off ebay soon but it just seems odd to not charge in the 2-3 hours that people are reporting off other 5v 1A power adaptors.

[Q] Charging Speed - Different from a/c than from USB?

So I was wondering: is there a difference in charging speed between the a/c wall charger and charging from my computer's USB port? Also, what's the difference between different chargers? For example, the Desire comes with a charger that puts out 1 amp. My girlfriend's BlackBerry has a micro USB charger as well, but the output is 700 mAh, or 0.7 amp. I've seen chargers ranging from 500 mAh (0.5 amp) to 1200 mAh (1.2 amp). How does this equate to charge time? Does it even? Or does the phone regulate the charge rate?

Benny_L said:
So I was wondering: is there a difference in charging speed between the a/c wall charger and charging from my computer's USB port? Also, what's the difference between different chargers? For example, the Desire comes with a charger that puts out 1 amp. My girlfriend's BlackBerry has a micro USB charger as well, but the output is 700 mAh, or 0.7 amp. I've seen chargers ranging from 500 mAh (0.5 amp) to 1200 mAh (1.2 amp). How does this equate to charge time? Does it even? Or does the phone regulate the charge rate?
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You've pretty much answer your own question!
The current supplied by a charger/USB port determines how fast it can charge the battery, which is why the wall charger (1amp) charges much faster than a PC USB port (0.5 amps).
Regards,
Dave

It's almost completely logical.. say you have a 1.5A battery (1500mA) and a 500mAh charger (ie USB) then it will take 3 hours for it to charge but with a 1000mAh charger it will take an hour and a half.
Can't really explain it more than that, so hth.

Well , Yes and No
This is only partly true ......
If you charge it on the PC , max output is 0.5 amps , and data is possible while charging .
Now with Desktop and car charger , the amp can be anything the manufacturer likes but you have to keep the following in mind :
USB Specs state the following :
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In Battery Charging Specification,[32] new powering modes are added to the USB specification. A host or hub Charging Downstream Port can supply a maximum of 1.5 A when communicating at low-bandwidth or full-bandwidth, a maximum of 900 mA when communicating at high-bandwidth, and as much current as the connector will safely handle when no communication is taking place; USB 2.0 standard-A connectors are rated at 1500 mA by default. A Dedicated Charging Port can supply a maximum of 1.8 A of current at 5.25 V. A portable device can draw up to 1.8 A from a Dedicated Charging Port. The Dedicated Charging Port shorts the D+ and D- pins with a resistance of at most 200Ω. The short disables data transfer, but allows devices to detect the Dedicated Charging Port and allows very simple, high current chargers to be manufactured. The increased current (faster, 9 W charging) will occur once both the host/hub and devices support the new charging specification.
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So if your Desire ( Yes , the Desire supports these specs ) detects the short , it will switch to fast charging mode otherwise it will limit the charging current .
Unfortunately , there's no way to know , just by looking at a charger, if it respects the specs or is just a low cost 5V powersupply . I've encountered quite a few ( mostly lowcost) desktop and car chargers that are rated between 1 and 2 amps , but still take bl**dy ages to charge the phone . Checking those with a measuring tool , you usually see the data pins are "Not Connected" instead of being shortened :-(((
Final Word .... don't try to save some money on a cheap charger , you'll regret it Genuine HTC works great , others do the same , but don't expect a $1 charger from Hongkong or whereever to do it !

These are the theoretical specs. Keep an eye on charger efficiency ratings and battery charge absorption won't be 100% in any case. Also bare in mind the charge is not linear, it will trickle after approx 80-90% with this phone.
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- Sent via my HTC Desire -

th3 said:
These are the theoretical specs. Keep an eye on charger efficiency ratings and battery charge absorption won't be 100% in any case. Also bare in mind the charge is not linear, it will trickle after approx 80-90% with this phone.
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- Sent via my HTC Desire -
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Ya, I noticed the charge slows down considerably for the final 10-15 %
I find myself charging my Desire more than I actually use it, lol.

I found now the answer to this problem: I use a Nokia charger (5v and 890 mA) with a microusb adapter. You can find one on eBay at ~2$
Now it takes about 2 hours from 20% to 100%
Lets hope nothing wrong happens to my precious Desire

look here for a method to charge at ac speed from usb, explains a few things too.

USB charging

helo,
i love how it takes only 90 minutes for a full charge on wall with nexus (took captivate and infuse 3 hours...what an improvement !!!)
When i use my other usb cables on computer alone at work, it charges less than my infuse. do i need to buy an oem data cable? the one that came with phone is kept bedside
anyone know how long to charge your nexus via usb only? my infuse was 5 hours, 3 hours via wall
thanks !

i never charged my nexus from 0 to 100 via a normal USB port ... but it will be longer!
The USB power adapter that comes with the nexus pushes out 1A, where a normal USB port on a computer or any other device will give you 500mA MAX. which is only half the power.
Well - just try it...?
And no - the cable does not matter at all... (if it's not broken)

Check the output rating on your wall charger. My regular HTC Desire Z wall charger outputs 1amp, but real world you can get about 700mah output. I think I read somewhere that the Nexus charger outputs more.
The regular USB port on a PC however is normally rated for a max of 500mah. Realistically you can get about 250-300mah output instead. You can install Battery Monitor Widget, it's really good for monitoring these kinda stats

will charge battery faster if phone shut down? and how does FAST CHARGE work ??

as we know , for example the wall charger has output of 1A.
and battery capacity is 1750 mAh , so in theory , it should be 100% charged in 1750 mAh / 1000 mA = 1.75 hours.
but consider something like cable resistance or whatever , i think it should be fully charged like 2.5 hours or so ...
but what strange is, i have an old wall charger which was come from with Nexus S , only has 700 mA output and the new one came with Galaxy Nexus which has 1 A output. but my application , DX power booster , charge estimated time shows exact same with both 700 mA and 1 A ... i just don't get it as they have different output current ...
and i think , when charger is plug in, phones runs on power source directly from charger which will decrease the current goes to battery i think , so will the battery charging be short if i shut down my phone when it charges ?
and as for a USB , 5 V and 0.5 mA , which is only half of wall charger , then why does FAST CHARGE will make it as shortly as wall charger ?
because i think , no matter it is on or off , it doesn't alternate the fact that USB still only has 500 mA output ...
maybe they are stupid questions ... but i just failed my physics back the time i was student ...

My Gnex charges WAY faster when it's turned off. A few times I've left the house and realized I forgot to charge my phone overnight so I turn it off, put it on the car charger and usually have a useable charge even if it's a fairly short trip.

If you're phone is off, it's not using the power it's getting from the charger, therefore it will reach 100% faster
Sent from my Galaxy Nexus using xda premium

qtwrk said:
as we know , for example the wall charger has output of 1A.
and battery capacity is 1750 mAh , so in theory , it should be 100% charged in 1750 mAh / 1000 mA = 1.75 hours.
but consider something like cable resistance or whatever , i think it should be fully charged like 2.5 hours or so ...
but what strange is, i have an old wall charger which was come from with Nexus S , only has 700 mA output and the new one came with Galaxy Nexus which has 1 A output. but my application , DX power booster , charge estimated time shows exact same with both 700 mA and 1 A ... i just don't get it as they have different output current ...
and i think , when charger is plug in, phones runs on power source directly from charger which will decrease the current goes to battery i think , so will the battery charging be short if i shut down my phone when it charges ?
and as for a USB , 5 V and 0.5 mA , which is only half of wall charger , then why does FAST CHARGE will make it as shortly as wall charger ?
because i think , no matter it is on or off , it doesn't alternate the fact that USB still only has 500 mA output ...
maybe they are stupid questions ... but i just failed my physics back the time i was student ...
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wall charging is only faster because your phone is not using battery while charging, so of course it would take a shorter time to reach full battery, thus appearing to charge 'faster'.
Fast charge is fooling the phone into thinking your charging from a wall socket instead of a usb, as when in usb mode it uses some of the power to transfer files between the phone and computer, so when in fast charge mode it only charges and cant be used to transfer files. this is from what i understand so far

vincentistan said:
wall charging is only faster because your phone is not using battery while charging, so of course it would take a shorter time to reach full battery, thus appearing to charge 'faster'.
Fast charge is fooling the phone into thinking your charging from a wall socket instead of a usb, as when in usb mode it uses some of the power to transfer files between the phone and computer, so when in fast charge mode it only charges and cant be used to transfer files. this is from what i understand so far
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But what I don't understand is, no matter you transfer files or not, it doesn't alternate the fact that USB output is still 500 mA...
Sent from my Galaxy Nexus using xda premium

When you activate Fast charge you fool the USB port to think it doesn't have a communication device attached, and thus can deliver up to 1.5A on the port (dependent on port type). The phone charges faster when turned off because it doesnt use any power itself. The charging board on the phone will always control how much current you can recieve at all times (even when off).
Taken from Wikipedia.
Charging ports and accessory charging adapters
The USB Battery Charging Specification of 2007 defines new types of USB ports, e.g., charging ports.[46] As compared to standard downstream ports, where a portable device can only draw more than 100 mA current after digital negotiation with the host or hub, charging ports can supply currents above 0.5 A without digital negotiation. A charging port supplies up to 500 mA at 5 V, up to the rated current at 3.6 V or more, and drop its output voltage if the portable device attempts to draw more than the rated current. The charger port may shut down if the load is too high.
Charging ports exist in two flavors: charging downstream ports (CDP), supporting data transfers as well, and dedicated charging ports (DCP), without data support. A portable device can recognize the type of USB port from the way the D+ and D- pins are connected. For example, on a dedicated charging port, the D+ and D- pins are shorted. With charging downstream ports, current passing through the thin ground wire may interfere with high-speed data signals. Therefore, current draw may not exceed 900 mA during high-speed data transfer. A dedicated charge port may have a rated current between 0.5 and 1.5 A. There is no upper limit for the rated current of a charging downstream port, as long as the connector can handle the current (standard USB 2.0 A-connectors are rated at 1.5 A).
Before the battery charging specification was defined, there was no standardized way for the portable device to inquire how much current was available. For example, Apple's iPod and iPhone chargers indicate the available current by voltages on the D- and D+ lines. When D+ = D- = 2V, the device may pull up to 500 mA. When D+ = 2.0 V and D- = 2.8 V, the device may pull up to 1000 mA of current.[47]
Dedicated charging ports can be found on USB power adapters that convert utility power or another power source — e.g., a car's electrical system — to run attached devices and battery packs. On a host (such as a laptop computer) with both standard and charging USB ports, the charging ports should be labeled as such.[46]
To support simultaneous charge and sync, even if the communication port doesn't support charging a demanding device, so called accessory charging adapters are introduced, where a charging port and a communication port can be combined into a single port.
The Battery Charging Specification 1.2 of 2010 [12] makes clear, that there are safety limits to the rated current at 5 A coming from USB 2.0. On the other hand several changes are made and limits are increasing including allowing 1.5 A on charging ports for unconfigured devices, allowing high speed communication while having a current up to 1.5 A and allowing a maximum current of 5 A.
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Problems with Quick Charge

This is in regarding my several week old HTC10, which I got off ebay. Phone is S-Off and running stock US unlocked firmware.
The phone is not able to negotiate quick charge with the original HTC charger.
If I use my old HTC charger (from the HTC ONE - 5V 1A) or my ipad charger (5V 2A) or my computer USB port (5V 0.5A), the phone will charge, although slowly.
If I attach the HTC 10 charger when phone is 80% or more charged (ie not really using quick charge), the HTC 10 charger will work, and phone shows "charging rapidly".
But if I use the HTC 10 charger when battery is less than 80% (presumably when the phone is asking for higher volts) I get this:
phone shows "charging on AC" for half a sec or so,
then "charging rapidly" for half a sec,
then "discharging".
This repeats every second or so, and the phone barely charges. (Certainly much slower than my 0.5A computer port.)
I suspect that the phone is having problems negotiating a charging voltage with the charger, and cycling on & off repeatedly as it tries.
I guess this is due to either a bad charger, a bad cable, or bad firmware or hardware.
I don't have other USB C cables or Quick charge 3 power brick to experiment with.
Anyone has any idea of which is likely the culprit?
This is not a deal breaker as I plan to use mostly my 1A charger to slow charge in order to preserve battery longevity. But it would be nice to figure out why quick charge is not working.
Thanks all.

Update: Borrowed a Samsung Quick Charge 2.0 adapter, and it worked with my current cable. So I guess the adapter is faulty.