I got this mod from a friend and when i tried to charge it after filling the tank the screen would turn on and then turn off and repeats.
Thank you for reaching out to us, we’d be glad to help you. With your case and this device, please verify that the USB charging port on the device is intact and tight, it should not be a loose fit. Most times these devices’ USB ports will sustain damage over time from plugging and unplugging the device. If the device doesn’t charge and you have verified this, you could purchase a bay charger in-store or grab another mod to charge your external batteries.
Best of luck!