Battery Life; Battery Operating Time - SoftBank X3HT User Manual

Battery Life

Do not use/store handset in extreme temperatures. Doing so may hinder
performance or shorten battery life. Use/store battery within 5 °C - 35
°C.
Use designated Charger only. Other chargers may hinder performance
and cause fire or overheating. They also may cause incomplete charging
or handset power not being turned on.
Battery is a consumable item. Replace battery when operating time
becomes noticeably shorter. A new one can be purchased.
Charging
Battery cannot be charged alone. It must be installed in handset.
Charging battery takes longer with handset power on.
Use designated charger only to charge battery.
Short-circuiting battery terminals may overheat or damage battery.
Charger, battery or handset may warm while charging; this is normal.
If charging generates interference, move charger away from TV, radio,
etc.
Charging Notes
Dirty terminals may hinder charging or cause power to fail. Clean battery,
handset or Charger terminals with a dry cotton swab.
Avoid storing handset with an exhausted battery installed. Charge at
least once every six months.
Use a case to carry battery separately to avoid short-circuiting the
terminals.

Battery Operating Time

The following actions shorten battery operating time:
Using/Storing handset in extreme temperatures
Using handset, battery or charger with soiled charging terminals
Using handset with weak signals or standby out-of-range
Playing music or video clips
Using Camera
Leaving Push Mail reception (Microsoft Direct Push) on (P.9-2)
Reduce Backlight Display time or close applications to extend battery
operating time (P.9-2, P.14-5).
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