The 12v Deep Cycle Gel Battery is usually the same as the regular lead-acid battery you use to start your car, except that the battery core contains gel instead of liquid. Gel batteries are considered safer because if the casing is damaged, the gel will not overflow, but if the casing is damaged, the liquid battery may leak sulfuric acid. The 12v Deep Cycle Gel Battery is a sealed unit, so unlike fluid-based batteries, you cannot access the battery. The best way to repair and restore a Sealed Gel Battery is to discharge it as much as possible, and then slowly charge the battery.

　　step 1

　　Before repairing and restoring the battery, check whether the battery is discharged. Turn on the lights and other electrical equipment of the car to use any power in the battery. When the battery is almost exhausted, the lights dim. There is no need to fully discharge the battery. Once the lights are dimmed, turn them off and any other electrical devices you have previously turned on.

　　Step 2

　　Squeeze the grip handle at the end of the black cable of the battery charger with your hand to open the jaws. Place the opened jaws on the 12v Deep Cycle Gel Battery terminal marked "-" or "negative", then release the pressure to close the jaws and tighten the terminals. Repeat the process using the clip at the end of the charger's red cable, but place it on the battery terminal marked "+" or "Pos."

　　Step 3

　　Check the front of the charger to determine which charging settings you can set. It is important to charge the gel battery at the lowest charging setting. Do not use "Boost" or "Fast-charge" because you may irreparably damage the battery.

　　Step 4

　　Set the charger to the lowest setting; it is usually labeled "Trick Charge". Some chargers have specific settings for gel batteries, so if you have one, please use it. If you do not have a gel or trickle charge setting, please make sure that the charge rate is 20% lower than the voltage output of the 12v Deep Cycle Gel Battery. The voltage is clearly marked on the battery and is usually 12 volts. Taking 12 volts as an example, you need to charge the battery with a voltage of 10 volts or lower.

　　Step 5

　　Plug the battery charger into the power source. Turn on the charger and let the battery charge. Touch the side of the battery after 6 hours. If it is hot, that's fine, so continue charging, but if it feels hot, turn off the charger and let the battery cool down for about 30 minutes. Then turn on the charger again.

　　Continue to charge the battery, but check every six hours to make sure it does not become too hot. After 24 hours, your gel battery has been repaired, restored, and fully charged, so please turn off the charger. Disconnect the two clips on the battery terminals.