Deep cycle batteries are best suited for use with 12 volt operated lights,
appliances and inverters. Deep cycle batteries are designed to have a majority
of their capacity used before being recharged. These are available in many sizes
and types, the most common is a non-sealed, liquid electrolyte battery. The non-
sealed types have battery caps. The caps should be removed periodically to
check the level of electrolyte. When a cell is low, only distilled water should be
added. Water consumption will vary depending on many factors: how far the
batteries are depleted, how long the voltage is being applied to charge the bat-
teries, how much voltage is used and how often this occurs.
NOTE: Tap water contains minerals which can alter battery
chemistry and ruin the battery. Use only distilled water when
refilling the battery.
At a minimum, the battery electrolyte level should be checked at least once
a month. Check the level sooner if the battery is frequently used. The level
should be above the top of the plates, but not overfull. Most batteries have a
plastic cup or well. The electrolyte level should be approximately 3/8” below
the well to allow room for expansion while the battery is being charged. Over-
filling the battery will allow the electrolyte solution to boil or gas out of the
battery cap. Remember to use only distilled water to refill the battery. A battery
with a low electrolyte level will boil the water out rapidly once the plates have
been exposed to air. This process may take only a matter of hours. If this has
happened the battery is more than likely damaged.
After checking the battery’s electrolyte levels it is also a good idea to check
the battery connections for tightness and corrosion. If any corrosion is found,
disconnect the cables (make sure to mark their locations) and carefully clean
them with a mild solution of baking soda and water. There are also aerosol
products available that will work. This will neutralize any acid that may be
present. Do not allow the solution to enter the battery as this will damage the
electrolyte balance. Use water to rinse the top of the battery and surrounding
area when done. Carefully hook the cables back to the battery. Coat the termi-
nals with petroleum jelly or an anticorrosion grease.
The battery cable to battery terminal connections should be metal to metal.
Periodically, check the batteries for corrosion. Look for cracks and check the
vent plugs. Replace them if they are cracked or missing. Keep the top of the
batteries clean. The accumulation of electrolyte and dirt may permit small
amounts of current to flow between the terminals, which can drain the battery.
WARNING: Liquid lead acid batteries produce hydrogen gas
while being charged. This is highly explosive. Do not smoke
around batteries. Extinguish all flames in the area. The hydro-
gen gas may explode resulting in fire, personal injury, proper-
ty damage or death.
Electrical Systems - House
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WINDSOR
8•214
Deep Cycle
Battery
Battery Maintenance
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