I have a MightyMax Lithium Iron Phosphate Battery for sale. Tested, works. Has had very little use. Operating Voltage: 12.8 volts. Charging Voltage: 14.6 Volts. Max continuous current: 20 Amps. Max surge current: 80 Amps (10 seconds). ML35 - 12LI. 12 Volt. 35 Amp HR.