3. Hold the hydrometer in a vertical position at eye level and note the reading where the electrolyte meets the
scale on the float.
4. ρ25℃ = ρt +0.0007（t-25)
ρ25℃ ——25℃ electrolyte specific gravity ； ρ
t ——t℃ electrolyte specific gravity.
5. Test each cell and note the readings (corrected to 80° Fig. 30 Hydrometer F or 27° C). A variation of fifty
points between any two cell readings (example 1.250 -1.200) indicates a problem with the low reading cell(s).
As a battery ages the specific gravity of the electrolyte will decrease at full charge. This is not a reason to replace
the battery, providing all cells are within fifty points of each other.
Since the hydrometer test is in response to a vehicle exhibiting a performance problem, the vehicle should be
recharged and the test repeated. If the results indicate a weak cell, the battery or batteries should be removed and
replaced with a good battery of the same brand, type, and approximate age.
BATTERY MAINTENANCE
Our experience shows that the key to achieving optimum performance and long life is a solid battery
maintenance program using the simple procedures
outlined here.
Equipment:
We recommend the following equipment for use in battery care and maintenance:
Recommended Equipment:
◆
◆ Wrench
◆ Distilled Water
◆ Voltmeter
◆ Hydrometer
◆ Thermometer
◆ Post Cleaner
◆ Baking Soda
◆ Vaseline
◆ Goggles & Gloves
CAUTION: Always wear protective clothing, gloves, and goggles
When handling batteries, electrolyte, and charging your battery.
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