Rotax's optimate litium battery charger is the product needed to charge Rotax Lithium battery 12V/4Ah. 

With 5 Amps of charge current available, OptiMate Lithium's unique multi-step Ampmatic™ program recharges and balances cells within the battery quickly and efficiently. Tests and displays battery condition before charging.

Voltage retention test is conducted for 30 minutes during which no charge current is delivered, and provides results indicating the battery's general state of health.

Charge progress is tracked against the ideal LiFePO4 charge curve, internal damage will be detected and unnecessary charging of a battery that cannot be recovered is prevented.