A hydrometer check or electrolyte gravity test can let you know if your battery is charged, faulty or partially charged.

2. A hydrometer check or electrolyte gravity
test can let you know if your battery is
charged, faulty or partially charged. The
meter measures the concentration of a
substance such as sulfuric acid, alcohol or
sugar. It gives you a density ratio with
respect to the water content. It has a glass
tube, rubber bulb and graduated capsule.
The device is easy to find and fairly
inexpensive.

3. Preparation
You will need acid-resistant glasses and
gloves to complete this task. Use a
hydrometer with a self-adjusting reading
and built-in thermometer. Remove any
buildup and dirt from the top of the power
cell. You can use a solution of warm water
and baking soda. Remove the caps with a
screwdriver. If the electrolyte is not
touching the filler rings, add distilled water.

4. Performing the Check
Squeeze the meter’s rubber bulb and
immerse the tip in the existing electrolyte.
Release the bulb to draw in the electrolyte
and keep the meter in a vertical position.
Raise it to eye level to read the number the
intercepts the electrolyte’s surface level.
Write this number down. Do a gravity test
for the remaining cells and make a note of
each reading.

5. If your hydrometer does not adjust to
different temperatures on its own, use the
conversion table on your device to make
the necessary adjustments yourself. Some
hydrometers may work differently, so
consult with the manual before performing
any tests. Hydrometer tests are not difficult
and can easily be done in your home.
Check your battery before you make an
unnecessary trip to the shop. Visit this
website to learn more about hydrometers
and other battery accessories in San Diego
- www.batteryworldsd.com/accessories