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I have an on-going project of creating a battery extender for my xda and I want to share it.
This is composed of 8 rechargable NiCAD or NiMh battery connected in series to produce a 9.6 v. The 9.6 v will be regulated by a 5v regulator (LM7805) then it will be connected in the XDA power dongle.
With this project, the battery life can be x4 or more depending on the batteries used.
I'm currently (no pun intended) trialling a Mugen 4500mAh battery which looks likely to give me >16 hours continual use ob my XdaII. Probably much more expensive than your solution but perhaps more convenient being 'built-in'.
Good idea though, I could have done with your solution two years ago!
Update on my project
I already assemble it and have try it already and here is the update.
The good news is the battery is charging.
The fall back is that the regulator that I have used is emitting too much heat.
I also have done some bench test and here are the data for those who are interested.
1. XDA IIs is drainning about .700 Amperes when charging supplied by 5v
2. XDA IIs will not charge with 4.8 V or below
-I got this data using a adjustable power supply with an Ampere meter
Project Fall down
For the fall down, I think it is because of two reason:
1. It is because the total Voltage supplied by the batteries is 9.6V and the out put regulation is 5V, therefore the 4.6V is being converted to heat.
- I should have use 6 battery insted of 8 to 7.2v instead of 9.6.
2. Since 5v is the out put of the regulator and it is charging the battery with a 4.8v (for i.e.) this will mean that the .2v drop will be in the line between the charger and battry which also mean the current is the max output of the regulator (Applying OHMs Law I=V/R, and R being 0 will result to infinity in theory and maximum in reality)
____________
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V1=5V V2=4.8V
|___________|
-I think I should have put a resistor to control the current or I should have designed a regulated current supply instead of a regulated voltage supply
For the #2 reason i'm not still sure about this because, this can only be true if the XDAIIs or it's battery does not have a built in charging circuit.
I have read some articles on mugen battery that it has a overload protection circuit my guess is that XDA also have it my I dont have any information yet. Incase XDAIIS or the battery alreadhave a charging circuit I only need to resolve my #1 Fall down.
I think I need to do more research, but if anybody could provide me information it will be highly appreciated. XDAIIs service manual maybe a greate help.
resolved
My project is now working, the over heating was resolved by putting a heat sink on the IC regulator and reducing the numbers of AA battery to 6 pcs (6 x 1.2 =7.2).
I'm still not sure where the over charging protection circuit is installed (XDA unit, battery or in the power supply/Craddle) incase it is not with the xda or the battery then I need to be carefull not to overcharge my battery with my project but if it is in it then my project is now perfect.
Any body knows where the over charging protection circuit is please help.
Re: resolved
there is a russian link for the same project - http://forum.pocketz.ru/index.php?showtopic=11339&hl=battery extender&st=100
Adapter:
http://wince.box.ru/russian/caradapter.htm
typically you can take any car adapter, give 12v to its input and take 5v from output for charging your PocketPC battery. Most car adapters would give 5V output if input is between 8...12V
hi kabayan,
i think the over current protection is in the device.
i converted an external battery charger (using 4x AA battery) intended for blue angel to my himalaya. there's nothing inside it except for a 10K resistor in series with the output.
i also noticed that even with the correct regulated voltage applied, my hima won't charge without a current limiting resistor, so its definitely an over current protection in the device!
congrats in your project!
Schematic Diagram
Anybody has a schematic diagram of XDA? Please share
If you have the money might as well buy additional battery so no need for you to go thru all thoses stuffs. My project had work for me actually it is easy just basic ohms law. The challenge I have encountered in the project was the heating up of the regulator but it was resolved. by the way the reason I made a battery extender is because that time extra battery is not easy to find and I dont have a budget for it so I just salvage some electronic parts from my previous projects. But now I already bought an extra battery- a lot convience than before
Hi,
I'm thinking about getting a bike-charger for my Androidphone and was wondering how much current would be necessary for an average device to charge or at least not drain?
The charging-device I'm currently looking at gives out about 300mA.
The reason why I don't state which Androidphone I'm using is that I want to future-proof my bikecharging, I don't want to get a new charger when I get a new device. Of course I'm not talking about a tablet.
Could someone edit the title of the thread to "[Q]How much ampere does a Androidphone need for charging?"
most android phones (at least most smartphones today) require 5volts at anything from 500mA to 1A for charging. Even if you supply them with 300mA they will charge if they are in standby but may actually drain under heavy use. You only have to respect the voltage rating - 5Volts. And i recommend at least 500mA, just to be sure.
If you need to build it from scratch.. you may need a dynamo attached to the bike's wheel. A bike dynamo will give you variable voltage/current. You need to regulate the flow of electricity from the dynamo to the phone, otherwise you risk killing the phone due to temporary spikes in voltage from the dynamo. An easy fix would be to use a LM7805 voltage regulator (available at electronics store, radioshack etc). It costs a couple of cents, and it will output a steady 5Volts if you supply it with anything ranging from 6 to about 28 volts.
Also check if the dynamo is supplying continuous or alternative current. If it's alternative, you need to use a rectifier bridge (also available at radioschack) to rectify the alternative current to a continuous one. A small 5 amp bridge should be enough. So.. your setup should look like - bike dynamo ->rectifier bridge ->lm7805 voltage regulator -> phone usb connector.
Have fun
Thanks for the info! I think I'll then have to go with a device that gives more ampere than just 300 mA - mobile data, gps navigation & music playback is what I'd classify as "heavy use", and that's what this whole setup is for
Also thanks for the update about all the extra equipment - I'll probably just go with all-in-one package, I know nothing about electronics
facdemol said:
most android phones (at least most smartphones today) require 5volts at anything from 500mA to 1A for charging. Even if you supply them with 300mA they will charge if they are in standby but may actually drain under heavy use. You only have to respect the voltage rating - 5Volts. And i recommend at least 500mA, just to be sure.
If you need to build it from scratch.. you may need a dynamo attached to the bike's wheel. A bike dynamo will give you variable voltage/current. You need to regulate the flow of electricity from the dynamo to the phone, otherwise you risk killing the phone due to temporary spikes in voltage from the dynamo. An easy fix would be to use a LM7805 voltage regulator (available at electronics store, radioshack etc). It costs a couple of cents, and it will output a steady 5Volts if you supply it with anything ranging from 6 to about 28 volts.
Also check if the dynamo is supplying continuous or alternative current. If it's alternative, you need to use a rectifier bridge (also available at radioschack) to rectify the alternative current to a continuous one. A small 5 amp bridge should be enough. So.. your setup should look like - bike dynamo ->rectifier bridge ->lm7805 voltage regulator -> phone usb connector.
Have fun
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Now that is a helpful and informative post! If only more members were this decent
Whatever operating system it uses, it will roughly use the same amount of power.
What I did for my winmo Toshiba is to get 12......yes TWELVE rechargeable AA batteries, two 6 AA Battery holders, a plastic hobby box to house everything in, a samsung car charger (12v - 1amp max). I connected all the AA batteries in series. Then using the innards of the car charger, connected it to the battery terminals. The car charger works from 8v - 24v. When the rechargeable batteries are about to die, they go to 1v, so the car charger can still get the most from the batteries. I made a holder in my bike and this has been powering my phone It's awesome really as under testing with my old O2 XDA Orbit, the battery lasted for atleast 18 hours..... with a gps application running, screen brightness on full, music playing full whack, bluetooth on and wifi on!!
On my bike, the battery pack lasts enough for a week of cycling which is plenty enough for me!! Better than a dynamo ;-)
How much ampere does a Androidphone need for charging?
I agree with facdemol except for one part of his reply. I believe he meant DC (direct current) and AC (alternating current). If it is AC then he is correct about the rectifier bridge being required to change AC to DC which a is a power source his phone can actuallly use.
Does anybody know of an existing solar charger with the amperage to charge the Galaxy tab?
fjl307 said:
Does anybody know of an existing solar charger with the amperage to charge the Galaxy tab?
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I have not seen a non-professional grade solar charger that can crank out the 2 amps, needed to get your Tab charged in a reasonable time. You can, if you disable the power-requirement option (see other threads for this), trickle load the Tab to keep it more or less topped up, but unless you are willing to go for a professional (i.e. expensive) solar unit I, for now, do not see a real valid solution.
But hey, I'm only putting my own $0.02 here. I hope somebody can correct me and mention/suggest a good solution here... Hoping.
theoretically
5v x 2A / 75% efficiency = 13.3 w of solar cell . I suppose a 15w solar cell would provide the charge current in full sun. but thats expensive kit for charging your Tab
Excellent device
If u mean the solar power bank charging for phone, it must exist. I have ever seen that.
samsung battery and samsung charger
samsung battery and samsung charger parts for laptops on cbattery.net
Im using solargorilla with a Powergorilla as a battery, so the panel charges the gorilla and then im charging the device from the gorilla.
Have used it to charge my dell laptop, my p7500 & my s3 without any problems.
Sometimes if i only charges my phone or my tab i don`t use the gorilla, so it can charge the p7500 by itself without a problem.
Since i never has an answere to people befor now i cant post links, but you will find both devices on: www powertraveller com
Hope that helps you
Sent from my GT-P7500 using xda app-developers app
with such a growing technology and sudden inventions, such charger is very possible to be existing, if not, it's not far from being developed, by the way I have not seen it by my self...
tommygHTCdream said:
5v x 2A / 75% efficiency = 13.3 w of solar cell . I suppose a 15w solar cell would provide the charge current in full sun. but thats expensive kit for charging your Tab
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Yeah its cheaper to use amasing 10 buck car charger
You can purchase a 10 watt panel ($25)on ebay- I bought an ecoworthy model, getting about 15 watts under peak sun. Then feed the panel to a voltage regulator ($5 eBay - step down regulator, has USB port for output & pinouts). That would charge directly from sun.
Best setup is an inline battery (you can use any voltage and using the same regulator to charge - read up on proper voltage charge rates) That way excess power is stored so your charge doesn't fluctuate with sun conditions.
Sent from my SAMSUNG-SGH-T989 using xda app-developers app
Hi, my phone Note 2 baseband/ firmware is N7100UBALI9, but came with power AC charger USA prong(flat) with output 2 Ampere. All knowledge of electronics, I'm just wondering from a professional user (xda devs) is it safe using/charging regular charger output 0.5A or 1A?? or can degrades something inside the phone's/lifespan? All i know the device such iPad needs more Amperes to charge. Please check/see my charger photo below. I'm apologize my english is not perfect. I'm noob beginner. Thank you very much ,appreciate.
bongbongcong said:
Hi, my phone Note 2 baseband/ firmware is N7100UBALI9, but came with power AC charger USA prong(flat) with output 2 Ampere. All knowledge of electronics, I'm just wondering from a professional user (xda devs) is it safe using/charging regular charger output 0.5A or 1A?? or can degrades something inside the phone's/lifespan? All i know the device such iPad needs more Amperes to charge. Please check/see my charger photo below. I'm apologize my english is not perfect. I'm noob beginner. Thank you very much ,appreciate.
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My charger is 2 amp too (bought it Sweden). My older S2 has a 0.7 amp charger (both standard original chargers). The chargers them self can handle the amps printed on them without breaking or extending the charge time. The chargers are more or less "stupid" power supplies. The electronics in the phone handles the battery charge current. The phone even monitors the battery temp, and the charge current can probably be either aborted or limited based on the temp.
My opinion, based on knowledge as a kind of "advanced" electrician...
Note II is designed for the 2A charger, that's what it needs. You can charge with lower outputs, but it'll take a lot longer to do so.
The amperage of the charger does not affect a phone battery life span. The phone draws the amount of amps needed.
I'm guessing since Samsung provided a 2amp charger, that the note 2 should be drawing that much amps. Any other charger with less amps won't harm it, but rather take longer to charge.
Sent from my SPH-L710 using xda app-developers app
So i will not worry. Thanks because i was not sure if okay or not. Thank you guys. Appreciate your answer.
there is a component in the phone which will limit the flow of max current into the phone like the S2 (450amp and 650amp, iirc the values). changer provides 2amps but phone will draw whatever it is needed. in cases if it allows, 2amps speeds up the charging process.
The phone actually draws 1300mA.
change values
sianzb0i said:
there is a component in the phone which will limit the flow of max current into the phone like the S2 (450amp and 650amp, iirc the values). changer provides 2amps but phone will draw whatever it is needed. in cases if it allows, 2amps speeds up the charging process.
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hi! do you know how to change those iirc values? the charger provided with my note2 is rated 2A out. but when i charge, this charger generates a lot of heat. i think the heat is wasted current since the phone doesn't accept that much current. i just want to know how can i adjust these values.
thanks!
psycotrompus said:
hi! do you know how to change those iirc values? the charger provided with my note2 is rated 2A out. but when i charge, this charger generates a lot of heat. i think the heat is wasted current since the phone doesn't accept that much current. i just want to know how can i adjust these values.
thanks!
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your charger is converting Alternating Current from your wall socket into Direct Current for your phone. The process isnt 100% efficient.
In PC's theres normally an efficiency rating that tells you how many watts of AC current is required to produce a certain amount of watts of DC current (converting from 110-240V down to 12V). ie. a 90% efficient power supply will draw 1000W of AC from your wall to produce 900W of DC for your PC. the remainder of that energy is lost in the conversion process and is often released as heat and other forms of energy.
same thing is happening in your charger. in the process of converting AC to DC (110-240V down to ~5V), some energy is lost, and some of that lost energy is released as heat. our note 2 can handle 2A of current with no issues, the heat is because our chargers are not 100% efficient in their conversion, not because the phone cant handle the current.
I made an interesting discovery lately relating to the whole charing time thing and I was wondering if anyone else had encountered this.
When I first got my SGN2 I also immediately picked up a couple of extra MicroUSB cables from **** Smith. One was for the car and the other was to replace the rather short one provided / for PC data transfer.
I have found that the charging time using my wall charger + the **** Smith cable is absolutely horrid. I am talking 4+ hours for a full charge. Today I figured I would try the original cable provided by Samsung and I am back to getting very close to 1% per minute give or take.
This left me with the question. Was this change related to the physical properties of the cable or the LENGTH of the cable? It is a 2m cable opposed to the 1m one provided by Sammy. Is there different STANDARDS of microUSB cables? Anyone have any input on this?
On top of that...Would I benefit at all from charging the device slower? Would the battery last longer if I did? I have noticed a fair few discussions out there on this topic but none of them really provided a solid response so I figured I would ask again and see if there is any battery experts about
Cheers,
Sheik
Your absolutely correct about the charge time. It can very depending on the size of the wire,or more so the resistance of the wire. Its not so much the voltage that you plug into, its the current that is controlling the speed of the charge. The amount of current is determined by the charger current output measured in amps,and the wire resistance measured in ohms...its like trying to pour 5 gallons of water into a bucket thru a 1 inch tube verses pouring that same amount of water into a 3 inch tube. obviously the 3 inch tube would fill up the bucket at a faster rate. In that respect the 1 inch tube has more resistance than the 3 inch tube. The bigger the wire the faster the flow the smaller the wire the more resistance the slower the flow.. this is ohms law...hope it helps...
Sent from my SGH-T889 using XDA Premium HD app
In addition to that, check the amp rating of the charger.
Most of the chargers in the market has 1amp output, while original Note 2 charger provides 2amp output, which obviously charges faster.
thanks for the info
but from where i can find cable same like the original one
Thanks for that Kush. Makes sense enough. But its a bit strange that there is no ratings on the cables we buy when theres this kind of variation in the performance. I guess it hasnt been an issue up until now with devices rarely utilizing 2amps but with the majority of smartphones and tablets pulling that and more now, along with the increasing size of batteries, we will probably start to see different ratings on our microUSB cables... Or one can hope at least...
EDIT: @ rasel800 - Sorry I was a little vague in my original post with that one Rasel. I am indeed using the out of the box 2amp Samsung wall charger that came with the phone. I just changed the cable because I wanted a little extra length.
xfive_no5 said:
thanks for the info
but from where i can find cable same like the original one
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I wouldn't mind knowing myself! Its not something thats actively advertised so I think would be a little hard finding the right ones. I think its just one of those cases where if you want to be sure you spend some exorbitant amount and get one from your manufacturer... -_-
I had the same issue, bought some cheap cables from eBay and they don't even provide enough power to charge at all with the standard charger. There is a large variation in cable quality.
Sent from my GT-N7100 using xda app-developers app
KUSHLEGEND said:
Your absolutely correct about the charge time. It can very depending on the size of the wire,or more so the resistance of the wire. Its not so much the voltage that you plug into, its the current that is controlling the speed of the charge. The amount of current is determined by the charger current output measured in amps,and the wire resistance measured in ohms...its like trying to pour 5 gallons of water into a bucket thru a 1 inch tube verses pouring that same amount of water into a 3 inch tube. obviously the 3 inch tube would fill up the bucket at a faster rate. In that respect the 1 inch tube has more resistance than the 3 inch tube. The bigger the wire the faster the flow the smaller the wire the more resistance the slower the flow.. this is ohms law...hope it helps...
Sent from my SGH-T889 using XDA Premium HD app
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Actually it's I=U/R, so the current depends on the voltage. If U=5V and I=2A, then R=U/I=2.5Ohm. That'd be quite a bit for a 2m cabel http://www.cirris.com/testing/resistance/wire.html?
I'd rather guess the problem is with the pin layout of the cable.
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