You may want to consider it is the device that is the problem.
Epic Storm is a Re-branding, Either a Lavatube Mini or the Young June Mini
I cannot relate experience to the Lavatube But the Young June is a power house. It also is a Power sucker. Mine will drain a battery in a day if left on and NOT in use.
What ohm coils are you running?
What Voltage are you set to?
How Heavy do you vape?
All this is part of the formula for Battery performance time.
2.0 ohms dual
4.5 - 5.0 volts
pretty heavy at the time I was a bit snookered by the end of the night.
I just thought that having 3 fully charged batteries would last me longer than that. Even if I was drunk chain vaping....