WirthCo 20025 Battery Doctor 6V/12V 900mA Fully Automatic Battery Charger/Maintainer Suitable for safe charging and maintenance of 12 Volt, wet-cell, lead-acid, fully sealed lead-acid and gel-cell batteries, plus AGM and deep cycle Fully charges battery automatically then switches to trickle mode when full-charge is reached Prevents over-charging battery and has reverse hook-up protection 3 LED displays indicate charge status Includes quick connect ring terminals with 3 ampere in-line fuse and alligator clips