Battery Charge Notice - Unitech HT680 User Manual

If the main battery is removed, the backup battery ensures the data on SDRAM
is safe for up to 6 hours. To prevent data loss, do not leave the HT680
uncharged with the main battery removed for an extended period. See First
Time to Charge the Main Battery & Backup Battery on page 9 for more details.
Note: Unitech advises rechargeable batteries be replaced every year or after
500 charge/discharge cycles to guarantee optimal performance. It is
normal for the battery to balloon or expand after one year or the
maximum of 500 cycles. Although it does not cause harm, the battery
cannot be used again and must be disposed of according to the
location's safe battery disposal procedures.
If the performance decrease is greater than 20% in a Lithium-Ion battery,
the battery is at the end of its life cycle. Do not continue to use, and
ensure the battery is disposed of properly.
The length of time that the battery power lasts depends on the battery type and
how the device is used. Conserve the battery life through the following:
Avoid frequent full discharges because this places additional strain on the

battery. Several partial discharges with frequent recharges are better than
a deep one. Recharging a partially charged lithium-Ion battery does not
cause harm because there is no memory.
 Keep the lithium-Ion battery cool. For prolonged storage, keep the battery
at a 40% charge level.
 Do not leave the Lithium-Ion battery discharged and unused for an
extended period because the battery will wear out and the battery's life will
be cut in half.

Battery charge notice

It is important to consider the environment's temperature whenever the
Lithium-Ion battery pack is charged. Charging is most efficient at normal room
temperature or in a slightly cooler environment. It is essential that batteries are
charged within the stated range of 10°C to 45°C. Charging batteries outside of
the specified range could damage the batteries and shorten their charging life
cycle.
CAUTION! Do not charge batteries at a temperature lower than 0°C, which will
make the batteries unstable and unsafe. Please use a battery
temperature-detecting device as a charger to ensure a safe
charging temperature range. To protect the battery from inflating,
the battery includes thermal protection and will not charge when
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