The main power source is a rechargeable lithium polymer (Li-Po) battery. The battery has a nominal capacity of 1400 mAh and can be recharged through Universal Serial Bus (USB).
Nordic Thingy:91™ has a power switch that physically disconnects the battery and the USB power from the rest of the circuits. This switch must be on for Nordic Thingy:91 to work and charge the battery. When the power switch is in the OFF position, it activates a circuit that drains the 1.8 V power domain.
Figure 1. Schematics for battery connector, and the power switch
