Q1. What is the maximum charging current? whether can reach or not? A1:To protect the battery, the system automatically identifies the battery voltage and selects the most appropriate current to charge the battery. When the battery voltage is low (for example, the 12V battery is less than 11V), the system automatically charges the battery at the maximum current. Q2:Does The LifePO4 battery can fully charged? A2:There will be a callback feature after this type of battery is full, and the power is off about 1V, which is normal, please know! Q3:Whether it exit problem when the Fan made noise? A3:Please don't worry.it belongs normally Phenomenon when the fan of charger made a little noise. Q4:Does the charger can remeber the previous battery type when it power up?or does it have Memory mode when it restart? A4: The charger has a memory function and will automatically select the last mode Features: - Charge current switch. -Have Memory mode after power off -For batteries used on Battery Management Systems(BMS) only. -For charging 12V or 24V LiFePO4 batteries. -For activation or maintenance of weak, old and idle batteries. Used to select a mode for charging 12V or 24V Lithium batteries, -Can not repair severely damaged batteries. Not for Lithium and LiFePO4 batteries. -For ordinary lead-acid batteries/maintenance-free batteries including AGM, GEL, SLA, WET, DEEP CYCLE, EFB,Calcium, etc. Specification: AC input: 100-240 V 50/60Hz Output voltage :12 V / 24 V Output current :12V20A 24V10A No-load output voltage :27.6V Minimum starting voltage: 7.0V Power and load :MAX 240W Size :158 x90x50mm(6.22 x3.54 x1.97 inches) Suit for :Lithium/LiFePO4/Lead-Acid (AGM,GEL,EFB, MF, FLOODED, VRLA, SLA and Wet batteries..) What to get: 1X 20A Car Battery Charger 1x 3M Extension Power Cord(AU Plug cables' length only 80cm) 1x Cable Clip 1x Manual 1x Retail Box 4 Charging Modes Can Selectable Lithium/LiFePO4/Lead-Acid(AGM,GEL,EFB, MF, FLOODED, VRLA, SLA and Wet batteries) and Repair Mode 3 Levels Adjustable Current 24V/3A 15V/5A---24V/5A 12V/10A---24V/10A 12V/20A Built-in Fooling Fan