Loading ...
Loading ...
Loading ...
2.7- DETERMINING BATTERY STATE OF CHARGE AND CONDITION
Use an automotive type BATTERY HYDROMETER to determine battery STATE
OF CHARGE and CONDITION. Follow the hydrometer manufacturer's instruc-
tions carefully.
Batter_rl State of Charge:- Check the specific gravity of electrolyte
fluid in al! battery cells. Write down the reading of each cell as it
is taken, then return the fluid to the cell from which it was
withdrawn. When the specific gravity of the fluid in all cells is
known, calculate the average specific gravity. If the hydrometer does
not have a percentage of charge scale, compare the average reading ob-
tained with the following:-
SPECIFIC GRAVITY PERCENT OF CHARGE
1.260 100%
1.230 75%
1.200 50%
1.170 25%
If necessary, recharge the battery to a 100% STATE OF CHARGE.
EXAMPLE:- Readings obtained are 1.230; 1.220; 1.230; 1.210; 1.225;
1.230. Sum of all readings is 7.345. Divide by 6 to obtain the average
of 1.224. The battery is less than 75% charged.
Determininq Battery Condition:- If the difference in specific gravity
_-etween the highest and lowest reading cell is 0.050 (50 points) or
more, the battery is nearing the end of its useful life and should be
replaced. However, if the specific gravity of the highest reading cell
is less than 1.200, the test for condition is questionable. Recharge
the battery and repeat the test.
EXAMPLE:- Specific gravity readings are 1.230; 1.220; 1.230; 1.210;
1.225; 1.230. Battery condition is good. If readings are 1.250; 1.180;
1.240; 1.240; 1.240; 1.210- battery is worn out.
10
Loading ...
Loading ...
Loading ...