SoftBank 730SC Manual page 15

Battery
Keep battery out of the reach of children.
They may sustain injuries. And when using, do not let them
remove battery from handset.
Do not leave battery in direct sunlight or inside
vehicles.
Overheating or fire may occur and performance may be
reduced.
Do not expose battery to liquids.
Performance may deteriorate.
If battery fluid makes contact with skin or clothes:
Rinse with clean water immediately.
Do not dispose of exhausted batteries with ordinary
refuse.
Tape over battery terminals before disposal, or bring them to
a SoftBank shop. Follow local regulations regarding battery disposal.
Do not throw or abuse battery.
Battery may overheat, burst, or ignite.
Charge battery within a range of 5°C- 40°C.
Battery may leak/overheat and performance may deteriorate.
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If a child is using handset, explain all these
instructions and supervise handset's usage.
If there is any abnormal odor or excessive heat, stop
using battery and call the SoftBank Customer Center,
Customer Assistance.
Do not leave battery uncharged.
Charge at least once every six months.