TM 9-6140-200-14
(a) Remove one of the battery filler caps and check the liquid level of the
battery cell.
NOTE
To get an accurate reading, the liquid of the battery cell
should be at normal height when the battery is tested.
Any water added to the battery should thoroughly mixed
with the electrolyte by charging the battery before testing.
If the battery is dry, and a field charge is not permitted,
Replace defective battery.
(b) If allowed, add water to battery and bring to normal level.
(c) Charge battery to mix water with existing electrolyte.
(d) Insert tip of tester into cell and draw enough electrolyte to float the glass
hydrometer in the barrel of the tester.
(e) Take electrolyte specific gravity reading.
(f) Check tester thermometer. If thermometer indicates battery solution is 80
degrees Fahrenheit., take specific gravity reading directly from the
hydrometer scale. If thermometer indicates battery solution temperature
is above or below 80 degrees, perform electrolyte temperature check
(paragraph d (2). which follows:
(g) Record reading.
(h) Return electrolyte to battery cell and install battery cap.
(i) Make a separate test for all other battery cells and record readings. Install
all battery filler caps.
(j) Check each cell of the battery, it must be within 0.025 maximum specific
gravity of all other cells. If a greater difference exists between any two
cells, battery is defective. Replace battery.
(k) After using tester, flush hydrometer with clean, clear water.
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