Grin Technologies Cycle Satiator
The Cycle Satiator is a universal charger for all types of ebike batteries. You can program up to 20 custom charge profiles for any lead, nickel, or lithium battery pack with a full charge voltage of 63V or less. With 360 watts of charging power, it is over twice as fast as your normal 4 amp "Fast Charger", and yet it fits in a smaller package.
This 48V 8A model will charge packs with up to a 63V max charge voltage (15s for lithium)