12.8 VOLT 18 AH Lithium Iron Phosphate (LifePo4) battery, screw in terminals. Lithium Iron Phosphate has 10X the charge cycles as conventional Sealed Lead Acid.
12.8 volt 35 ah Rechargeable Lithium BatteryPSL SC ヨ Serial Connection Capable Series*Will work directly with existing charge system. 10 x more charge cycles with zero discharge.