Charger for 36v batteries - charges fast at two settings - a high and low charge rate. Wouldn't work with my 36v Dolphin case battery because BMS limits charger input. Luna Cycle said they stopped selling these and then wouldn't take this back when I wanted a return for a refund. I paid $100 for it but to me it's a paperweight since I can't use it. If you have some big 36v batteries that don't use piddly little connectors maybe you can use it. $75 shipped anywhere in continental US.