Antigravity Batteries is happy to offer the OptiMate TM-471 Maintenance Charger by TecMate. At 0.8A, it’s a lower amp charger but still charges or maintains All 12V Antigravity Batteries as well as other brands of lithium batteries. A great, cost-effective charger for your lithium battery maintenance. Unique LiFePO4 battery protection! 3-year limited warranty.