Bulb-Type (Hydrometer) Tester.

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.

(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.

3-12