Sorry for my poor english first of all. I bought a converter for 110v to 220v to charge my mod with charger came with the package. I can see the sign of charging in the screen, for sure it is charging. but the thing is i never know when its gunna fully charged. I have tried to charge up to 12 hours and the result was like 15%. this happens same to USB charging. (I'd like to say usb charging seems faster than using converter) here is a picture of monitoring. Vendor says they can replace it for me. but i wanna try to solve this problem by myself if it's not about hardware problem.