Battery Charger
Not all lead-acid car battery chargers are designed to be deep cycle battery charger especially since the needs of a deep cycle battery are drastically different than those of a regular car battery.
A 12V deep cycle battery is a lead-acid battery that is used in applications where it will spend much of its life being regularly deeply discharged. That might include trolling motors, sailboats, other small vessels, vessels with a deep cycle marine battery, forklifts, floor sweepers, remote-site electronics, RVs, highway electric vehicles, traffic signals, uninterruptible power supplies, audio equipment, or golf cart batteries to name some examples. A deep cycle battery charger must be able to handle their special needs when charging deep cycle batteries.