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11
EFFECT OF ELECTROLYTE LEVEL ON
SPECIFIC GRAVITY
Varying electrolyte levels will affect the specific gravity reading of electrolyte. The
specific gravity reading will decrease as distilled water is added to cells and will
increase as the electrolyte level decreases. Over time, it is normal for the electrolyte
level in each cell to drop as water evaporates during the charging process.
For reference, a decrease of 31mm (1/8”) in electrolyte level will typically result in an
approximate increase of .003 in specific gravity.
MAINTENANCE
VENTILATION & VENT CAPS
Hydrogen gas is produced when charging flooded lead-acid batteries. To avoid a
buildup of gas and/or risk of explosion, proper ventilation is required, and the battery
vent caps must be kept clean and properly installed. Remove dust, dirt or other
material that may prevent the free circulation of air. The batteries should be inspected,
and vent caps removed, cleaned, and replaced periodically as part of the regular
maintenance procedure.
A sticky dark gray residue may be visible on the inside of the standard 1/4-turn
bayonet, R-Caps or watermiser vent caps on flooded battery cells. This buildup of
dirt and dried electrolyte is quite common and, over time, may clog the vent holes
preventing the release of hydrogen off-gas during charging. Inspect the caps and clean
using a neutralizing baking soda and water solution as necessary.
CLEANING STEPS:
1. Clean the vent caps by soaking in a solution of water and baking soda (100g per
litre) in a bucket or small bowl. Let the vent caps sit overnight to neutralize and
break down any electrolyte in the caps.
2. Flush the vent caps clean by forcing water through the vent holes. Water should
drip freely. A trickle of water should flow from all vent holes, indicating the cap is
clear of debris.
3. Allow the vent caps to dry completely. Once dried, shake recombination caps
(where supplied) to make sure the condensing beads on the inside of the cap rattle
slightly. If you do not hear the beads, let the cap dry for an additional 12 hours or
repeat the process above.
Summary of Contents for 16 CH 25P
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