Hello all, having a slight problem with my trustfire 18659 batteries (....ty batteries I know) for my itaste VTR. I own and use a xtar vp1 charger which displays the voltage of the battery charging and the final voltage. Now one of my batteries charges to 4.20v like it should, and my second would charge to 4.20v, but the past 2 days it started getting lower and lower. It would charge to 4.19v and now it's down to finishing charging at 4.15v. Should I be concerned? The other one still charges to 4.20 and I'm worried that the other one keeps getting lower and lower. Did I do something wrong or can I prevent this or save the battery? They're both only a week old. Help me guys! Thanks!