Furukawa electric S153 Ver.2, Руководство пользователя

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Basic Operation
6-6
5. Disconnect the S958C charger from AC power source.
S943B battery is lithium ion type rechargeable battery; it can be recharged at any time,
regardless if it is fully empty or still with some residual power.
If storing battery for a long time, the power level becomes very low caused by
self-discharging and the battery may be degraded. Be sure to recharge the battery at
least every 2 months even when not in use.
It is possible that the battery could not be fully charged, if moving the battery from a
cold place (<5°C) to a warm place (around 20°C) and then immediately charging it. In
this case, make sure battery is in the new environment for a short while to equalize the
temperature, then charge the battery.
When charging battery, the room temperature must be in the range of 5 - 40°C.