smoktech groove

I'd like to modify my smoktech groove by pulling the o.g. flat batt and solder in a 18650. Ive already verified that the unit will work/ vape with a single 2000 mah imr, but I'm afraid to plug it in to see if it will charge. I'd like some reassurance before I plug error in. any help would be...

Has anyone come across this device for sale in quantities of less than 100? Groove Smoktech,Buy Quality Groove Smoktech from Manufacturers and Suppliers on Alibaba.com Looks very promising indeed.