Unitech EA630 Plus User Manual page 9

Battery Notice
1. To guarantee optimal performance, it is recommended that rechargeable
batteries be replaced every year, or after 500 charging cycles are
completed. It is normal for the battery to balloon or expand after one year
or 500 cycles. Although it does not cause damage, it cannot be used again
and must be disposed of according to the location's safe battery disposal
procedures.
2. If a battery performance decreases more than 20%, the battery is at the
end of its life cycle. Stop use and ensure the battery is disposed of
properly.
3. The length of time that a battery lasts depends on the battery type and
how the device is used. Conserve the battery life by doing the following:

Avoid fully uncharging the battery because this places additional
strain on it. Several partial uncharges with frequent charges are better
than a fully uncharged battery. Charging a partially charged battery
does not cause harm to the unit.

DO NOT leave the battery pack or in the device in a hot condition
such as in the car with closed door on a hot day or similar
environment, and/or under direct sunlight for an extended
period of time. High-temperature condition might cause the
battery damaged for further safe usage. Keep the device with the
battery within acceptable operating temperatures (please refer to
the "specification" section for further details).
To guarantee optimal battery performance, we generally
recommend you replace your rechargeable batteries every two
years, or after 500 charging cycles. By ignoring the warning
message from above and continuing using the battery
neglectfully may lead to a critical consequence
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