I had dramas with mine in Feb last year. The screen died so I got another one as a free replacement. When I opened up the dead one I saw how badly designed the internals were. The steel squonk tube/ positive pin was shorting against the board with the slightest movement. They made the mod tiny by squishing all the components together really tightly inside. Like
@AngeNZ , I wouldn't leave a battery in mine overnight.
I think
@Fredman1 bought one around the same time - not sure if he had problems with his.