Battery and Charger
MERGE 11-11
Chapter 11
Procedures for inspection with hydrometer
1. Before inspection, first ensure that the battery has sufficient electrolyte to cover the electrode plates
by about 1/2 inch (13mm) and is fully charged. In case it is a must to fill water, the batter should be
recharged before the inspection with hydrometer.
2. Remove the air bleeder cover. Measure with the thermometer and take down the electrolyte
temperature at Battery Compartment No.2.
3. Extrude the rubber bag of the hydrometer before inserting the battery compartment. Release the
rubber bag slowly so that the electrolyte is sucked into the glass tube of hydrometer.
4. Adjust the liquid level of the electrolyte when the buoy floats above the bottom to such a degree that
the buoy is in neither contact with the bottom nor the top of the glass tube. Take down the
hydrometer from the battery compartment before releasing the pressure of the rubber bag.
5. Take hold of the hydrometer vertically so that the buoy will not touch the sidewall. Raise the hydrometer
to the height the same as the eyes and observe the scale value of the liquid level of electrolyte
(see Fig
11-8).
6. Take down the reading and enable the electrolyte in the hydrometer to return back to the battery
compartment. Replace the air bleeder cover.
7. Repeat Step 2-6 to all battery compartments.
Calibration of hydrometer
Most of the hydrometers are calibrated and can perform precise measurement under 80
℉
(26.7
℃
). The
above observed readings should be corrected according to the temperature. Every increase of 10
℉
(5.6
℃
) over 80
℉
(26.7
℃
) should result in the addition of 0.004 to the reading. Every decrease of 10
℉
(5.6
℃
) below 80
℉
(26.7
℃
) should result in the subtraction of 0.004 from the reading.
Hydrometer inspection result presentation
The table below shows the rough electric quantity the charged battery has:
Specific gravity (corrected
with the temperature)
Rough charging condition
1.250-1.280 100%
1.220-1.240 75%
1.190-1.210 50%
1.160-1.180 25%
In case the difference between batteries is not less than 0.020, the problem may lie with the battery
compartment with relatively lower specific gravity. It may need additional charge or may be light current
battery. In case the difference between batteries is not less than 0.050, the battery with relatively low
specific gravity should be replaced.
Summary of Contents for 2010 E-Merge
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