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Tips on inspection
Check battery electrolyte level regularly
Using a battery with insufficient battery electrolyte may cause an explosion.
Explosions and their causes: automobiles and construction and farm equipment that use old lead batteries
Explosion incidents in fiscal 2008
Causes of explosions in fiscal 2008
59 incidents by type
Battery electrolyte level inspection manual
1. Why does the battery electrode decrease?
This phenomenon occurs primarily during recharging (while the vehicle is running). The battery electrolyte decreases when excess energy is applied to the battery over the storage capacity (over charging), and the water in the battery electrolyte decomposes into oxygen and hydrogen gases. The battery electrolyte also decreases through natural evaporation. Thus, when the temperature around the battery is high, or when the battery is used frequently (deep charge and discharge applications, such as day and night lighting, refrigeration units, power gates) or when the battery is near the end of its life, the battery electrolyte decreases a lot in a short period of time. The battery electrolyte decreases when it is being used, thus daily inspections of the battery electrolyte level are necessary.
2. How to perform a battery electrolyte level inspection
1. When a battery electrolyte level indicator is located on the side of the battery
Clean the battery electrolyte level indicator with a cloth moistened with water, and check that the battery electrolyte level is between the UPPER LEVEL and LOWER LEVEL lines. If a dry cloth is used to clean the indicator, static electricity may ignite a fire and cause an explosion.
When the battery electrolyte level is lower than half way between the UPPER LEVEL and LOWER LEVEL lines, immediately add purified water (battery electrolyte replenish solution, or similar solution available commercially) until the battery electrolyte level is at the UPPER LEVEL mark. After adding battery electrolyte, be sure to tighten the vent plugs.
2. When there is no battery electrolyte level indicator on the side of the battery. Or when there is no UPPER LEVEL indicator on the side.
Remove the plugs from the top of the battery and look into the battery to verify the battery electrolyte level. If the battery electrolyte level is lower than the sleeve, be sure to add purified water (battery electrolyte replenish solution, or similar solution available commercially) until the battery electrolyte reaches the bottom of the sleeve.
If too much purified water is added and the battery electrolyte level goes beyond the UPPER LEVEL mark or the bottom of the sleeve, use a dropper to remove water until the level drops to the UPPER LEVEL mark or bottom of the sleeve. After removing battery electrolyte, neutralize the acid with baking soda (bicarbonate of soda) and then flush thoroughly with water. Otherwise consult the battery manufacturer. If the battery is used while the electrolyte is at the LOWER LEVEL mark, the internal parts will degrade quickly, and even if the electrolyte levels are brought up to normal, they will decrease immediately, so please check frequently and add fluid when necessary.
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