I think you are missing what i am saying here, "The battery was charged for 8 hours and lasted only 10 minutes!'If you are a heavy vaper you have several options.
1.) Carry a couple batteries
2.) Carry a PCC
3.) Use a USB pass through which can connect to a portable USB battery box or you can plug it into a computer or a car adapter.
If your real heavy smoker option 3 can be done for under $39 which is quite a bit less than a mod.
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Sounds like a defective batt to me?