Specific Gravity Testing (If equipped with Flooded Batteries)
1. Do not add water at this time.
2. Wash hydrometer with deionized water first
3. Fill and drain the hydrometer 2 to 4 times before pulling out a sample.
4. There should be enough sample electrolyte in the hydrometer to completely support the float.
5. Take a reading, record it, and return the electrolyte back to the cell.
6. Check electrolyte specific gravity for each cell, testing one cell g temperature by thermometer (often from
mid-cell).
7. Check all cells in the battery, repeating the steps above.
8. Replace the vent caps and wipe off any electrolyte that might have been spilled.
9.ρ25℃ = ρt +0.0007（t-25)
ρ25℃ ——25℃ electrolyte specific gravity.
ρt ——t℃ electrolyte specific gravity.
10. Check the state of charge using Table on the next page.
The readings should be at or above the specification of 1.280±0.01g/cm3.
If any specific gravity readings register low, then follow the steps below:
1. Check and record voltage level(s).
2. Put battery(s) on a complete charge.
3. Take specific gravity readings again.
If any specific gravity readings still register low, then follow the steps below.
1. Check voltage level(s).
2. Perform charging. Refer to the charging section for the proper procedure.
3. Take specific gravity readings again.
If any specific gravity reading still registers lower than the specification of 1.280±0.01g/cm3 then one or more of
the following conditions may exist:
1. The battery is old and approaching the end of its life.
2. The battery was left in a state of discharge too long.
3. Electrolyte was lost due to spillage or overflow.
4. A weak or bad cell is developing.
5. Battery was watered excessively before testing.
Batteries in conditions 1 - 5 should be taken to a specialist for further evaluation or retired from service.
◆ Do not smoke near batteries.
◆ Do not overtighten terminals. Doing so can result in post breakage, post meltdown, or fire.
Electrolyte specific gravity is 1.10g/cm3 under full charging, if cannot test or not air bubble in cell
during of charging, then short circuit happened.
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