ZEN S30, Manual

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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, please buy a new battery.
Use only the approved batteries, and recharge your battery only
with approved chargers designated for this device.
Unplug the charger from the electrical plug and the device when
not in use. Do not leave the battery connected to a charger.
Overcharging may shorten its lifetime. If left unused, a fully
charged battery will lose its charge over time.
8.2
Note information
Do not drop, knock, or shake the device. Rough handling can
shorten the life of the battery.
Do not make short-circuit occur to the battery.
The battery put in hot or cold places, such as in a closed car in
summer or winter, will reduce the capacity and lifetime of the
battery.
Do not put the battery near flammable or explosive goods.
Do not dispose of batteries in a fire!
Never use any charger or battery that is damaged.
Use the battery only for its intended purpose.
Dispose of batteries according to local regulations. Please