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www.enersys.com Publication No. US-FL-IOM-002 January 2007
In cold climate with unheated battery rooms, water should be added only when the battery
temperature is 50
o
F (10
o
C), or above.
Never add any special types of powders, solutions or jellies to the batteries.
12.5 Quality of Water
Only distilled, deionized or other approved water (Deionizer Cat. 94866, Watering Gun Cat.
92755) should be added to the battery.
Approved water is water that has been analyzed by a qualified laboratory and found safe for use
with lead-acid storage batteries. Local municipal water supplies in the U.S.A. & Canada are
usually satisfactory. Obtain an analysis from the local municipality to be sure the results comply
with the impurity levels in Table 12.1.
Before drawing water from a tap or spigot, run the water for several minutes to clear metallic
impurities from the pipes.
Do not store the water in a metal container.
Use a clean container made of glass, rubber or
plastic. The container should not have stored anything but water in the past.
The following table shows the maximum allowable impurities:
TABLE 12.1 — BATTERY WATER QUALITY
MAXIMUM IMPURITIES
Requirements
Maximum Allowable Limits
Parts Per Million (P.P.M.)
Total Solids*
350.0
Fixed Solids*
200.0
Organic and Volatile*
150.0
Iron
4.0
Chloride
25.0
Ammonium (NH
4.0
4
)
10.0
Nitrates (NO
2
)
10.0
Nitrates (NO
3
)
0.07
Manganese
40.0
Calcium and Magnesium
* ASTM Spec. D-1888 Method A or equal
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