Not a poor battery per say, totally verboten in your application though.I only picked this up today so I have not vaped on it much (and will not be vaping on this battery anymore at all.). However the mod was not fused so I am very lucky. One thing however I did notice in the total of 4 puffs I had on this vape is that the button got very hot very quickly. I am assuming this is due to the poot battery.
Glad you came here, picking up current draw is a must to continue the pleasures of a Mech..