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BikeMaster Lithium-Ion Battery Charger/Maintainer
I can only find one lithium ion battery on Amazon (not for a LiFePO4 battery). Only LiFePO4 batteries can be charged with the other "lithium" battery chargers. I discovered that the charging algorithms used by lithium ion and LiFePO4 are different. I use it to recharge the Harbor Freight Hercules 12V 2.0 Ah Lithium-Ion Compact Lightweight Battery. It actually has a BMS board and 3X18650 3.7V lithium ion batteries inside. The battery pack's open voltage, as measured, is 10.9V in over-the-shelf condition. I take off the plastic cover and replace it with a homemade SAE quick disconnect charger port-equipped sealed lead acid battery for a Honda gas lawn mower starter. It automatically stops once it reaches... after approximately an hour of charging.
BikeMaster Lithium-Ion Battery Charger/Maintainer
Works flawlessly two years later. It is well-built and waterproof (when plugged in, it literally received a bucket's worth of rain). The indicator lights are great, and it charges my bike without any problems.
BikeMaster Lithium-Ion Battery Charger/Maintainer
The charger broke down after nine months. I don't think I charged my battery using it more than five times.