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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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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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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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