Our 12 Volt 300 Amp-hour Lithium-Ion Battery has a Built-in Battery Management Systems (BMS) with power terminal cut-off and recovery. Lithium Battery Company 12V 300AH Lithium-Ion Battery is a high-performing deep cycle battery designed as a “drop-in replacement”, this is a plug and play option for any application that currently uses a lead-acid, gel, or AGM battery. This Group 8D lithium iron phosphate (LiFePO4) battery is ready to replace your heavy lead-acid battery bank in your sailboat, RV or solar energy system. The highest quality lithium chemistry from Lithium Battery Company. The 12V 300Ah LiFePO4 Battery from Lithium Battery Company is a safer, more lightweight alternative to lead-acid in various marine applications.