If you charge your batteries via USB on the mod, it could very well be that your problem is that the USB has become damaged from constant use/movement/stress (either the external contacts or the internal on-board soldered contacts) and is causing a short.
This is a pretty common problem in mods and pods when the USB is used regularly. The mod acts completely dead except possibly if you plug into the USB. Sometimes you have to juggle it around to see some life. If your USB is the problem, unless you have the skills to fix it, the mod is effectively a really nice looking paper weight.
If you never or rarely use the USB port, then try blowing out the USB port as there may be debris in there causing the short. I know my USB ports on my 18650 mods can get rather gunky with pocket lint because I never use them except to update firmware.
This is a pretty common problem in mods and pods when the USB is used regularly. The mod acts completely dead except possibly if you plug into the USB. Sometimes you have to juggle it around to see some life. If your USB is the problem, unless you have the skills to fix it, the mod is effectively a really nice looking paper weight.
If you never or rarely use the USB port, then try blowing out the USB port as there may be debris in there causing the short. I know my USB ports on my 18650 mods can get rather gunky with pocket lint because I never use them except to update firmware.