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13
. Due to the characteristics of the nickel cadmium battery, 20°C to 25°C (68°F to 77°F) is the best
temperature condition for charging and discharging efficiency.
CAUTION:
Charging under the temperature condition of below 0°C (32°F) should be avoided.
. When
the battery
voltage
decreases below
the normal
limits, the battery level indicator (+) in-
dicates. Be sure to stop the calculation as soon as the battery voltage is decreased. If the EL-811
is used with the battery source being applied after the battery level indicator indicates, miscalcula-
tions may occur and the battery unit's life expectancy is shortened. Charge the battery unit while
operating on AC power with AC adaptor or rapid charging.
. Even defective or used batteries should not be thrown into a fire or dump into a dustbin,
It can be operated in the carrying case by DC power. But, be sure to take it out of the carrying case
when operating on AC power or charging the unit.
. Be sure to charge the battery by using AC adaptor (EL-81). Do not use other chargers.
machines or adaptors.
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