Who's running an AGM battery in a weekend driver?

Optima batteries must use an AGM mode charger ...OR...just do what others have done and put a Lead acid in parallel and that LA voltage will trip the automatic charger and start charging the optima as well. Lipo batteries have a similar issue when they get low the BMS will open the circuit and won't allow a charger to charge it (or the device to pull from it) as it will permanently damage the cell. So you have to use a lipo charger (up to 48 hours) to wake up these old cells or wire a like voltage cell in parallel and allow its voltage to trick the BMS to close and force a charge into the cell. Even "defective" lipo cells can be woken up with this method. My scooter i found in an abandoned apartment building took 48 hours on a lipo charger to finally take a charge: the charger probes the BMS with a pulse maybe every minute or so to see if it will take a charge, this minute pulse adds up over time and finally gives the BMS or cell enough voltage to trigger the BMS to allow it to start charging. Or you can charge the cell behind the BMS until it is charged enough to allow the BMS to let it change normally. Tricky stuff but these scooter/Ebike batteries are awesome in AH capacity.