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10. RULES FOR THE CARE OF THE LITHIUM-ION BATTERIES
The following rules should be noted when caring for your lithium-ion batteries if you want
to maintain the performance of the energy store for as long as possible:
·
The first charge is crucial. Fully charge the battery before using it for the first time.
·
Each battery only has a limited number of charge cycles. Don't therefore recharge the
battery at every opportunity. Instead use it until it is almost flat (10...20% of charge).
Depending on loading, the high-quality, 3 Ah capacity battery cells can be charged
up to 2,000 times. Assuming 250 days are worked a year and that the batteries are
charged daily, this corresponds to a battery life of 8 years.
·
If the battery is discharged below its nominal voltage, this can trigger processes
which damage or destroy the battery. The batteries are therefore fitted with electronics
which warn the user and shut down the device before total discharge can take place.
·
Frequent overcharging can also permanently damage the battery. The charger therefore
automatically finishes the charging process as soon as the battery is fully charged. Do
not attempt to force more charge into the batteries by unplugging and reconnecting
the charger. Such action will not produce a higher charge - it will only damage the
batteries.
·
Charging should generally only be undertaken at room temperature (around 18 - 21
degrees). Avoid charging a cold battery as it damages the cells. Always warm the
battery up to room temperature before charging, especially when it is cold outdoors
in winter.
·
High temperatures also damage the battery. Never leave the battery, and preferably
not the entire tool box, in the car or direct sunlight on hot sunny days. At temperatures
above 60 degrees Celsius, the Li-ion battery permanently loses capacity.
·
Lithium-ion batteries shouldn't be stored flat or fully charged for long periods. Extensive
testing has found a capacity of 40...50 % and low temperatures (but not below 0°C)
to be optimum for storage. Ideally they should be kept at 5°C to 10°C. Recharging is
needed at least every 12 months as the batteries will self-discharge.
·
A battery which is not being used should be stored in a cool but not cold place. Even
when not being used, batteries lose energy. The Li-ion battery loses 3...5% of its
charge a month.
·
If a lithium-ion battery is not used for a long period, it should be recharged after 12
months at the latest otherwise it will be irreparably damaged.
·
Old, used batteries must of course be disposed of in an environmentally friendly
manner.
