Plug the charger into an outlet. With most A/C adapter chargers, a power light should come on automatically, or by flipping an "On" switch. Make sure that any power indicator lights come on, and you'll be ready to start charging your batteries. Always defer to the manufacturer's instructions.
Rechargeable batteries are most often charged in an A/C adapter, which you can plug into a basic home outlet. These chargers feature terminals sized in a variety of ways, from AAA to D. Depending on what kind of batteries you want to charge, you can usually find a charger appropriate for the size at any electronics or hardware store.
While lithium batteries can be partially charged without harming the battery, the same cannot be stated with AGM batteries. When charging an AGM deep cycle battery, you must fully charge the battery. Slightly overcharging the batteries is recommended to give them a boost.
Recharging your batteries is easy if you have the right charger. You can get battery chargers that plug into an outlet and charge a variety of different batteries. Never try to recharge single-use batteries, since this can damage the charger.
To Charge your AGM battery, use a smart charger with reverse pulse technology, which can help lower battery temperatures while charging. Alternator charging/ Split charging: Most alternators, in general, function well with both lead-acid and AGM batteries.
To charge the battery, simply connect the anode to the supply positive and the cathode to supply negative. If you're monitoring the current during charging, you'll probably notice it starts to decrease as the battery gains charge, which is a good sign that the battery is working properly.