XtremeCharge is designed to be a MAINTENANCE charger for any type of 12-V lead-acid battery. By imposing only the appropriate amount charge rate, the battery is maintained safely at its proper operating voltage indefinitely. Use PulseTech XCR-20 20Amp Xtreme Charge Five-Stage Maintenance Battery Charger for evaluation and testing, maintenance and 20 Amp bulk charging. Has proprietary charge algorithms, variable float charge and patented PULSE technology. This system uses our revolutionary ReNew-IT Pulse Technology to safely prevent the main cause of battery problems and failure: sulfation buildup on lead-acid battery plates.