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Electrical system
3. BATTERY
CHECKING THE CONDITION OF THE BATTERY
•
The battery should be removed from the machine to carry out checks.
•
When removing it, first disconnect the negative terminal to avoid any possible short
circuits.
•
The condition of hermetically-sealed batteries can be checked by measuring voltage
across the terminals with a digital meter that can measure tenths of volts.
•
Should the voltage be below that specified, the battery needs to be recharged.
The standard voltage across the terminals should be 12.5V or higher.
PROCEDURE FOR RECHARGING
Recharging hermetically-sealed batteries requires a charger with a specially stabilised output
for this type of battery.
These batteries are sealed. Do not add liquid nor open the plugs. This will modify the
characteristics and damage the battery.
Do not charge over 1/10th of its capacity.
SYSTEM FOR DETERMINING THE LENGTH OF CHARGE
In order to determine the length of time the battery should be on charge, the voltage across
the terminals should be measured using a meter.
Then noting the voltage axis on the graph, draw a vertical line until it intersects the slope of
the charge, and a horizontal one to the time axis in hours.
Example:
Observing the graph.
If we measure 12V across the terminals, we draw a line up from the 12V to intersect the
slope, and a horizontal one up to approx. 8 hours.
The charging time for the battery would be approx. 8 hours.
Voltage at the battery terminals
Graph of the charging time in terms of the
voltage at the terminals.
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