You know this how?
I have the UV-5R and it works like a champâŚalso the MTC UV-X4 which is a clone of the UV-3R, has a 5vdc charge port on the side (little spade that plugs in with a USB connector on the end)âŚmaybe it has a li ion charger circuit inside
P.S. Open source programming program that is ALOT better than the chinese version CHIRP
Oh and this will also help too