base. One is used for the charged battery. The other is used for
the battery that needs to be charged. The primary side coils are
mounted on the internal surface of the chargers. The battery
system as shown in Fig. 12 (b) is a Li-ion battery with the
secondary side coil and the receiving circuit board mounted
on its two surfaces respectively. Fig. 12 (c) shows the scenario
of the wireless battery charging.