Deep cycle batteries should be equalized every month or so, along with their regular charging. Equalizing refers to a steady, controlled overcharge of the battery that causes the electrolyte inside to bubble and remove the lead sulfate that builds up on the plates. The buildup occurs gradually with each charge and reduces the battery's ability to store a full charge. Equalizing your deep cycle batteries will keep them operation longer.
Instructions
1. Make sure the battery is fully charged, testing it with a voltmeter or multimeter. A fully charged 12-volt battery reads at around 12.7 volts or greater. The charge current will slowly decrease after the battery reaches its bulk voltage.
2. Set the charger's voltage to 7.8 volts for each cell the battery has (a cell containing 6 volts). In other words, set the voltage to15.6 volts if working with a 12-volt battery. Charge the battery at this level for at least 2 hours.
3. Top off the battery's electrolyte during the second hour, using clean distilled water and a clean funnel in one of the fill holes under the caps. Make sure no debris gets into the battery while filling.
4. Wipe away any mist on the battery tops after equalizing, using a disposable cloth. Keep the cloth away from any clothes or other objects that can be ruined by battery acid. Dispose of the cloth.
5. Continue equalizing each day until you get a full equalization charge. An equalized 12-volt battery can give a temporary charge of up to 14.4 volts.
Tags: 12-volt battery, cycle batteries, fully charged, Make sure
