User's Guide

Chapter Three - 24
Managing Power
Battery Maintenance & Storage Recommendations EE
Battery power will decrease gradually in storage. The rate depends on “self-discharge rate”
and the storage environment. Self-discharge rate of rechargeable batteries is approximately
1% per day. High humidity and high temperature accelerate discharge. Very low
temperature may “freeze” the battery chemicals thus decrease the capacity. The following
are guidelines for battery maintenance:
⚫ The battery life with system off is approximately 60 days, so it is suggested that the
battery be charged every two months so to avoid over discharging.
⚫ The battery should be removed if it will not be used for a long period of time
(approximately one month).
⚫ The battery should have 50% charge remaining before it is removed and be stored in
the temperature range of -20°C to 20°C.
⚫ The battery without using for more than 2 years may result in battery aging and it is not
recommended to use.
⚫ Self-discharge rate is related to storage temperature. The following recommendations
may show how often a battery removed from the device needs to be charged in different
storage temperatures.
- In -20°C ~ 20°C environment, it is recommended to charge the battery every year;
- In -20°C ~ 45°C environment, it is recommended to charge the battery every three
months;
- In -20°C ~ 60°C environment, it is recommended to charge the battery every month.