Nokia RM-608 User Manual page 55

The battery can be charged and discharged hundreds of times, but it will
eventually wear out. When the talk and standby times are noticeably shorter
than normal, replace the battery. Use only Nokia approved batteries, and
recharge your battery only with Nokia approved chargers designated for
this device.
If a battery is being used for the first time or if the battery has not been used
for a prolonged period, it may be necessary to connect the charger, then
disconnect and reconnect it to begin charging the battery. If the battery is
completely discharged, it may take several minutes before the charging
indicator appears on the display or before any calls can be made.
Safe removal. Always switch the device off and disconnect the charger
before removing the battery.
Proper charging. Unplug the charger from the electrical plug and the device
when not in use. Do not leave a fully charged battery connected to a charger,
since overcharging may shorten its lifetime. If left unused, a fully charged
battery will lose its charge over time.
Avoid extreme temperatures. Always try to keep the battery between 15°C
and 25°C (59°F and 77°F). Extreme temperatures reduce the capacity and
lifetime of the battery. A device with a hot or cold battery may not work
temporarily. Battery performance is particularly limited in temperatures
well below freezing.
Do not short-circuit. Accidental short-circuiting can occur when a metallic
object such as a coin, clip, or pen causes direct connection of the positive
(+) and negative (-) terminals of the battery. (These look like metal strips on
the battery.) This might happen, for example, when you carry a spare battery
in your pocket or purse. Short-circuiting the terminals may damage the
battery or the connecting object.
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