Plated hole connecting PCB layers.

Lithium-ion rechargeable battery cell.

Switching converter that increases voltage.

Electronic switch controlling power to a load.

Via passing through the entire PCB.

Lithium-polymer rechargeable battery cell.

Converter capable of increasing or decreasing voltage.

Electronic fuse providing programmable protection.

Via connecting an outer layer to an inner layer.

Connector linking a battery to electronics.