Backup Battery for IC-7300 Internal Clock
The IC-7300 has a rechargeable Lithium baltery to backup the internal clock. If you connect the transceiver to a power source, the battery is charged and it keeps the correct clock setting.
However, if you do not connect the transceiver to a power source for a long period of time, the battery will discharge. In that case, the internal clock will be reset.
If you do not use the transceiver for a long period, we recommend that you connect the transceiver to a power source at least once a month. The charging period is two days whether the transceiver’s power is ON or OFF.
If you have any questions regarding this notice, contact ICOM-UK Technical Support