I bought a couple VTC4 batteries earlier this month, they worked great until this morning.... I popped them both in my Sig 150 (only device I use them in) this morning, I capped for about twenty minutes before I noticed the power being cut off half way though a vape. When I looked at the screen it said my batteries had a 40% charge left. I took them out and put them in my charger. One was down to 3.43 volts, the other was still at 4.07 volts. What's the deal!? Is the battery just a dud, or is the Sig draining one more than the other?