Hi Tunnel, I don't know if this will help but if I read your 1st entry correctly, I think you said that you are vaping constantly for 3 hours. That seems like a whole lot for any battery (IMHO). I've also found that not all batteries are equal. I tend to by AW batteries because I have always found them reliable. One day, I picked up another brand at a Vape shop and it certainly didn't hold up like I'm used to with the AW's. Also, when we funA battery too low, it decreases their life Just my 2cents.
I'm sure there's more info out there from others too.