Erayak 12V 4A Battery Charger Fully Automatic 8 Step with Detection&Repair Function,Water Resistant-IP65(C9004) 12V battery charger and maintainer from 6-100Ah, maintenance charge to 160Ah; No sparks, short-circuit proof and reverse polarity protected makes it safe for all the vehicles electronics and easy to use . Fully automatic charging and maintenance in 6 steps maximizes battery life and performance; unique maintenance charging, a mode for optimized charging during cold winter days and the charging of demanding AGM batteries (i.e. Optima). Unique LED display allows the user to follow the entire charging process and provide visual state-of-charge feedback and diagnostic information. Portable and lightweight, this smart battery charger can be stored anywhere; Water and dust resistant(IP65) means it is safe to use in all climate situations . Numerous accessories simplifies using the same charger for multiple battery applications.