samsavvas
100 W
Hi Folks,
Haven't visited or posted for a few years after a long lay-off from e-bike matters due to illness. All good (or better) now fortunately. As a present to myself I'm building a new e-cargo bike & want to try to reuse some of the gear I've had stored in the shed for the last couple of years. In particular I have 2 Ping batteries - a 10Ah & a 20Ah made with pouch cells - which I fully charged before putting them away for storage.
When they were retrieved a couple of days ago & I attempted to charge them I found the first 8 LEDs on the BMS of both batteries lit up reasonably quickly, but the final 4 on each proved extremely reluctant to signal that the corresponding cells (or cell groups) were charging or charged up.
After 48hrs all 12 LEDs on the 10Ah have now lit up. However when disconnected from the charger they start to flash back & forth erratically & randomly after a few minutes. After 48hrs charging the 20Ah battery only 10 of the 12 LEDs are lit with #s 9 & 11 remaining dark.
What am I looking at here? I understand that individual pouch cells need to get to 3.75V before the BMS will attempt to balance them. Are some of the cells proving reluctant to charge up to this voltage - is that why some of the LEDs are staying dark? Why are the LEDs on the 10Ah flashing erratically when I disconnect the charger? Is it because the cells are only just up to 3.75V & self discharging below this level quite quickly? Should I just persist & keep charging them both over the next week or so? Will the pouch cells eventually 'wake up'?
Apologies for all of the questions - I've forgotten everything I knew about these batteries & am just trying to figure out what's going on. Any help or suggestions gratefully received.
Sam.
Haven't visited or posted for a few years after a long lay-off from e-bike matters due to illness. All good (or better) now fortunately. As a present to myself I'm building a new e-cargo bike & want to try to reuse some of the gear I've had stored in the shed for the last couple of years. In particular I have 2 Ping batteries - a 10Ah & a 20Ah made with pouch cells - which I fully charged before putting them away for storage.
When they were retrieved a couple of days ago & I attempted to charge them I found the first 8 LEDs on the BMS of both batteries lit up reasonably quickly, but the final 4 on each proved extremely reluctant to signal that the corresponding cells (or cell groups) were charging or charged up.
After 48hrs all 12 LEDs on the 10Ah have now lit up. However when disconnected from the charger they start to flash back & forth erratically & randomly after a few minutes. After 48hrs charging the 20Ah battery only 10 of the 12 LEDs are lit with #s 9 & 11 remaining dark.
What am I looking at here? I understand that individual pouch cells need to get to 3.75V before the BMS will attempt to balance them. Are some of the cells proving reluctant to charge up to this voltage - is that why some of the LEDs are staying dark? Why are the LEDs on the 10Ah flashing erratically when I disconnect the charger? Is it because the cells are only just up to 3.75V & self discharging below this level quite quickly? Should I just persist & keep charging them both over the next week or so? Will the pouch cells eventually 'wake up'?
Apologies for all of the questions - I've forgotten everything I knew about these batteries & am just trying to figure out what's going on. Any help or suggestions gratefully received.
Sam.
