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HomeRC & Power✈️Aircraft🚁Helicoptere-Electric Battery-Charger-pSupply › Need help with Li-ion battery
04-05-2010 02:48 AM  10 years ago
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ZXXflyer

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stone mountain, georgia, US

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Need help with Li-ion battery
I have a brand new mini key-chain camera... The 3.7V battery is fully charged, and reads 4.4 volts at the foils, but there is no voltage at the power wires coming off the battery... I believe it is a Li-ion battery.
There appears to be a voltage regulator(or some device) attached to the battery output. This is the part that has failed...

Can this battery be used without it?? Is it a voltage regulator or part of the charging system??

I know nothing about li-po and li-ion batteries.

Thanks guys!

EDIT:

It's a li-ion battery... the part attached to the battery is a PCB that protects it from over-charge, and over-discharge...

since the battery is reading 4.4V at the foils, and the PCB protects at over 4V, is it shutting the power supply off since the battery appears to be overcharged??

From what I have read and understand, I can remove the PCB from this battery and continue to use the keychain camera.... since there is no fear of over discharging the battery, and I can TIME it when charging through the USB... Right?
Believer in Weston motors!
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04-05-2010 07:33 PM  10 years ago
procrasher

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Cedar Capids, IA

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This is just an idea. "IF" the PCB board is sensing the batt is over charged and not allowing it to discharge than you should be able to hook a small light bulb or motor directly to the foil leads bypassing the PCB and drain the voltage down under the PCB cut off point to see if it will work properly without removing the PCB entirely.

One issue here. I am guessing there is something wrong with the PCB since it should never have let the battery get over its allowed voltage anyway. I could be wrong.

That also looks like a lipo to me?
If I say duck, I'm not talking about a bird that quacks!
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04-05-2010 11:28 PM  10 years ago
ZXXflyer

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stone mountain, georgia, US

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Update:

I tried to discharge it down to under 4V.... no luck there..

BUT... I un-soldered the PCB from the foils, and then re-soldered it, just for the heck of it... now it works!!! Apparently when it was soldered new, there was not enough heat applied to let the solder wick into the holes in the PCB that connect one side of the board to the other.

Believer in Weston motors!
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04-06-2010 02:31 PM  10 years ago
procrasher

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Cedar Capids, IA

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Bad connection! Classic electrical problem. Why didn't I think of that.If I say duck, I'm not talking about a bird that quacks!
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04-07-2010 08:50 AM  10 years ago
RAPTOR 4D

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GRANGER,IN,-USA

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Just make sure you charge it as a lipo, that type of battery
with that circuit board is made to charge with the power supply
so now that you removed it you have to use a charger designed for lipos and not the one that came with it!
Raptor 50 Titan SE
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04-07-2010 02:10 PM  10 years ago
procrasher

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Cedar Capids, IA

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I think he re-soldered the bad connection and did not remove the board. If so them he should be fine to use the original charger.If I say duck, I'm not talking about a bird that quacks!
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04-08-2010 11:13 PM  10 years ago
ZXXflyer

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stone mountain, georgia, US

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Correct... I re-soldered the PCB and it works fine now. And the original charger is a USB port. The battery is in a Mini DV(keychain) camera.Believer in Weston motors!
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04-09-2010 10:55 PM  10 years ago
thtoyman

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Gone ,Flying.

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I have a few of them, to. I also had few die. I maybe need to looking in to thins more
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04-10-2010 07:54 AM  10 years ago
ZXXflyer

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stone mountain, georgia, US

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see if it fixes yours too!!

I NEVER let anything die without trying to fix it, or AT LEAST determine what happened... ...plus I've been repairing electronics for years.
Believer in Weston motors!
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