It is necessary to own a good battery charger to maintain your batteries when there is emergency. The 12V/0-15A(Peak) and 24V 0-7.5A(Peak) smart battery trickle charger helps to charge most type of battery. It can charge and maintain batteries of car, motorcycle, lawn mower, boat, RV, SUV, tricycles, marine. They may also help restore drained and sulphated batteries. Specifications: Battery Type: Fit all type of 12V and 24V AGM, GEL, Flooded(Wet), Calcium type deep cycle, VRLA maintenance free lead acid and 12.6V Lithium batteries Battery Capacity: 6Ah - 400Ah Input Voltage: 100-250V AC, 50-60Hz Output Voltage:12V/15Amp Peak, 24V 7.5Amp Peak Charge Type: fully automatic with trickle charge Working Temperature: 50'C+/-20'C Cooling: Fan Switchmen technology: Yes Compliant standards: CE,ROHS,FCC, IEC60335 Size: 21.3x20.5x13.3Cm Weight:1100g How to use this battery charger 1). Check your battery parameters are compatible to the charger 2). Connect the red clamp to the positive pole (+), black clamp to the negative pole (-). 3). Connect the charger to an AC source, the charger will work. 4). Once the battery is fully charged, the battery list is displayed on the screen 5).The screen will show battery percentage and voltage, the current drops gradually below 1A Voltage identification range : 12V (10V-15V), 24V(20V-29V) Manual Repair Function Notice 1. For old/idle battery, it needs to press the "Manual Repair"button to repair the battery first 2. The longest repair time is 1-2 hours,it must be carried out under manual care. 3. If the charger shell is hot, please stop repair and plug off until it cool down. 3. Repair finish, please press the "Automatic Charge"button to charge the battery as normal.