I bought a cheap wireless charging kit on eBay for my old Samsung Galaxy S5 phone. It took nearly 3 months for it to arrive from china, costed about 8usd – but it works flawlessly.
The kit includes a wireless charging pad, of cheap plastic, and the circuit responsible for charging the phone.
The circuit requires no soldering – it just rests on-top of two terminals on the phone and is hold onto place by the battery. Simple, although it feels a bit flimsy during assembly I have had no issues with the circuit loosing electrical contact with the phone.