DRESSTA TD-25M EXTRA - Electrolyte in Tropical and Arctic Climates; Electrolyte State of Charge

SECTION 8 ELECTRICAL
Page 34
TD-25M EXTRA DRESSTA
BATTERY
c. Charging a Battery
1. The compartment in which the battery is being charged should be well ventilated.
2. Do not charge a battery unless you are thoroughly familiar with manufacturer's instructions.
3. Do not put a battery on charge unless you are wearing safety goggles and a face shield.
4. Turn the charge rate switch and timer to the OFF position before connecting the leads to the
battery. Next, connect the charger leads to the battery terminals, red positive (+) lead to positive
terminal and black negative (–) lead to negative terminal. Now, turn on the charger and slowly
increase the charging rate until the desired ampere value is reached. If smoke or dense vapor
comes from the battery, shut off the charger and reject the battery. If violent gassing or spewing
of electrolyte occurs, reduce or temporarily halt the charging.
5. Never touch the charger leads when the charger is ON. Always turn the charger OFF before
removing a charger lead from the battery.
11. ELECTROLYTE STATE OF CHARGE
A battery with a fully charged specific gravity of 1.265 corrected to 26.7 [°C] contains an electrolyte
with approximately 36 [%] sulfuric acid by weight or 25 [%] by volume. Pure sulfuric acid has
a specific gravity of 1.835. The specific gravity can be measured directly with a hydrometer
or determined by the stabilized voltage.
The state-of-charge battery shows the chart below.
Charge Level Specific Gravity Voltage
100 [%] 1.265 12.68
75 [%] 1.225 12.45
50 [%] 1.190 12.24
25 [%] 1.155 12.06
Discharged 1.120 11.89
Never take a hydrometer reading immediately after water is added to the cell. The water must be
thoroughly mixed with electrolyte, by charging. If a reading is being taken immediately after
prolonged cranking, it will be higher than the true value.
A correction factor must be applied for any specific gravity reading made when the electrolyte
temperature is not 26.7 [°C].
A correction factor of 0.004 specific gravity is used for each 5.5 [°C] change in temperature,
(0.004 are added to the each 5.5 [°C] increment above 26.7 [°C] and 0.004 are subtracted for each
5.5 [°C] increment below 26.7 [°C]).
12. ELECTROLYTE IN TROPICAL AND ARCTIC CLIMATES
a. Tropical Climate
Batteries used in temperature climates have a fully charged specific gravity in the 1.250
to 1.280 range. A fully charged electrolyte specific gravity of 1.210 to 1.230 is used
in tropical climates. This increases the service life of the battery.