This transmitter and receiver module set is capable of sending power wirelessly with a regulated output voltage of 5V and a maximum current of 2A. The transmission distance is as far as 6mm. Efficiency is as high as 90%.
These modules would be useful for creating a customized battery pack that charges without wires. Since the module isn’t a qi standard charger it will not work with cell phones.
Waterproofing and dustproofing are major areas that are benefited by wireless power transmission. The entire enclosure can be sealed but still charged. Coupling the wireless transmission with magnets to keep the coils aligned could provide a power solution that’s waterproof but doesn’t require batteries. Customized weatherproof speakers are one possible application.
1 x Wireless Power Transmission PCB with Coil
1 x Wireless Power Receiver PCB with Coil