Stop Buying New Power Banks: Here’s How To Fix Yours for Cheap#Haycide 155W#Shargeek h155

00:00 Teardown of broken Haycide 155W power bank 02:36 Disconnect battery from BMS, cut positive & negative wires 04:00 Remove built‑in 4‑series 21700 cells 08:00 Measure IR & voltage with homemade internal resistance meter, check cell reusability 09:20 Individual cell balancing repair with adjustable power supply 10:12 Repair finished, cell voltage difference less than 10mV, ready for reuse 12:00 Spot‑weld 4‑series 21700 battery pack 18:00 Reinstall BMS and power mainboard 19:00 Power‑on test, full repair, reassemble housing This is a Haycide 155W 20000mAh power bank. Improper use caused cell imbalance. The main protection board detected battery abnormality and cut off output, rendering the unit unusable. We disassemble it, take out the battery cells separately, and perform individual repair‑balancing with low‑current charging. After repair, reassemble to restore normal operation.