Rak10721 battery’s

I have a RAK10721 and I would like to add batteries but I don’t know what type. Can someone please point me to the specs or part numbers for the battery’s for this radio?

Thanks

18650 battery’s ? What’s the line in voltage for solar ? Shouldn’t this thing have a spec sheet somewhere ?

Welcome to RAK forum @johntdyer .

The specs of the battery is here - Solar Battery Lite for Sensor Hub | RAK9154 Backup Power

If you will use your own external power source, we add note on the store description.

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