Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Old May 20th 20, 08:00 AM posted to sci.electronics.repair
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Default USB Charging Module for 3.7V Lithium battery recommendation request

I have a pair of Even h3 headphones that had a short to ground on the
positive Voltage supply. The battery has a small circuit board attached
to the terminals, similar battery ct's state "built-in battery
protection circuit module PMC" for overcharging, overdischarging and
short circuit protection. I think the circuit got stressed from being
shorted to ground for too long too many times because the battery has
3.5 V after a short charge (connecting 4.5V directly to the terminals),
but the output voltage from the circuit board is anywhere from 0 to 0.5Vdc.

I'm looking at charging modules on ebay since this is a simple problem
and cheaper than a battery, can anyone recommend a charger module
they've had good luck with?

These looks good to my inexperienced eye, but they're stated to be for
an 18650 battery, I have a small flat battery, I don't know if this
matters.

high current (3A) version
5V USB 1S 3.7V Lipo Lithium Li-ion 18650 Battery Charging Board Charger
Module
https://www.ebay.com/itm/5V-USB-1S-3...d4lT EvZWK95w

lower current version
USB 1S 3.7v 4.2v Lithium Lipo Li-ion 18650 Battery Charging Board
Charger Module
https://www.ebay.com/itm/USB-1S-3-7v...QAAOSwvSxau44y

My battery is similar to this, same 503040 battery but different ct. board.
https://www.ebay.com/itm/503040-3-7v...s/193133417570

TIA
Mike




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Old May 22nd 20, 04:14 AM posted to sci.electronics.repair
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First recorded activity by DIYBanter: Oct 2017
Posts: 45
Default USB Charging Module for 3.7V Lithium battery recommendationrequest

On 5/20/2020 11:00 PM, Charlie+ wrote:
On Wed, 20 May 2020 00:00:16 -0700, Mike S wrote as
underneath :

I have a pair of Even h3 headphones that had a short to ground on the
positive Voltage supply. The battery has a small circuit board attached
to the terminals, similar battery ct's state "built-in battery
protection circuit module PMC" for overcharging, overdischarging and
short circuit protection. I think the circuit got stressed from being
shorted to ground for too long too many times because the battery has
3.5 V after a short charge (connecting 4.5V directly to the terminals),
but the output voltage from the circuit board is anywhere from 0 to 0.5Vdc.

I'm looking at charging modules on ebay since this is a simple problem
and cheaper than a battery, can anyone recommend a charger module
they've had good luck with?

These looks good to my inexperienced eye, but they're stated to be for
an 18650 battery, I have a small flat battery, I don't know if this
matters.

high current (3A) version
5V USB 1S 3.7V Lipo Lithium Li-ion 18650 Battery Charging Board Charger
Module
https://www.ebay.com/itm/5V-USB-1S-3...d4lT EvZWK95w

lower current version
USB 1S 3.7v 4.2v Lithium Lipo Li-ion 18650 Battery Charging Board
Charger Module
https://www.ebay.com/itm/USB-1S-3-7v...QAAOSwvSxau44y

My battery is similar to this, same 503040 battery but different ct. board.
https://www.ebay.com/itm/503040-3-7v...s/193133417570

TIA
Mike


Poundland cheap £1 Battery bank - they use USB small board to charge and
have BM you can use with 18650 or smaller Li cel - it doesnt matter. C+


Thanks!
https://www.youtube.com/watch?v=XnG86QMxGqw



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