E-Grom Charging Issue

[E-Moto Tuner]

I take my 6 12v lead acid batteries out of my E-Grom each fall/winter. Bike worked fine when I took them out, now with them reinstalled the charger shows red charging led for a second then goes to green showing a full charge. Voltage is 74 so its not full. Bike runs fine, and charger components look ok when I opened it up, no blown parts. I did check the batteries and one is 10.98V, so a bad battery but will this cause it to show fully charged when plugging the charger in? Would think it would still charge fully then fall flat when starting to ride.

 

[Chalo]

I take my 6 12v lead acid batteries

Found your problem.

Don't do that. You won't regret trying something better. That's coming from a guy who used 12V SLAs for years, before better options were cheap and plentiful enough to make the switch.

No.

 

[j bjork]

I did check the batteries and one is 10.98V, so a bad battery but will this cause it to show fully charged when plugging the charger in?

Maybe, if the internal resistance is high enough for the voltage to rise a lot when the charger is connected. What are the voltages on each battery during charging?

 

[2Phast2Delirious]

You can charge each battery individually (or just the bad one) with a 12v charger until all are fully charged.

About 15 years ago, I converted 2 gasoline cars to electric (120v DC & 144v ADC), with each lead acid battery having its own 3a charger, (individual battery maintenance aka Ghetto-BMS for SLA).

 

[E-Moto Tuner]

Changed out the bad battery with another good spare I had and it seemed to charge up fine. Will ride it and recharge and see if that's fixed it for good.