OK... so I had an issue yesterday. Apparently my batteries were out to get me. It started with one refusing to charge at work, but it did just fine charging at home (and it charged, I'm currently using it). But the second issue got me. I had switched batteries and about two hours into my usage of the battery I got what felt like a shock to my tongue while taking a drag. At first I thought it was in my head, but it only took a few seconds for the spot on my tongue to start hurting and I tasted a metallic taste. There was no mark, and it didn't happen again. But what could cause that and what do I need to do so it doesn't happen again? The battery is a 1000 eGo-T bought at a brick and mortar and it is just under 4 months old. It is the younger of the two batteries. I was also using a carto/tank. Any thoughts?