Quick Charger: Up to 25A quick charger, 4-Level adjustable current 3A/15A/25A/AUTO can meet your different needs. This 12V smart car battery charger, with 85% high efficiency (industry average: 75%), ideal for STD, AGM, Gel, Wet, MF, EFB, Calcium, Deep Cycle, LiFePO4 batteries Fully-automatic Charging: Auto-identify and charging, auto-stop at 100% charging, auto-start in 30 seconds while you forget to press start, auto-restart to trickle maintain when the battery voltage drops. This battery charger can remember your previous settings, with no worry about AC power failure when connecting for a long time 8-Stage Charging Program: Intelligent 8-Stage Charging include: Desulfation, Soft Start, Bulk Charge, Absorption, Analysis, Recondition, Float, and Pulse Maintenance. MCU controller monitor the whole charging progress, add charging precision, optimize battery power, and extend battery life Engine Start and Winter Mode: Engine start delivers 100A current helps activating your car battery to start your vehicle in 100 seconds. Winter Mode, +0.2v on the basis of the original charging voltage, better boosts your battery activity and charges more thoroughly in low-temperature situations Battery Repair: Advanced Recondition mode uses slow pulse reconditioner technology to detect battery sulfation and acid stratification to restore lost battery performance, help to repair old/idle batteries and extend battery life. If your battery cannot be charged, you can try "Recondition" mode to repair your battery, pls note: It can not repair a totally dead battery