I bought the PCC kit a few weeks back that included a black manual battery with 10 sec cutoff. After a week of use, the time to a complete charge increased to 2 and a half hours, while the battery life had decreased to 2 hours. My vaping habits have remained consistent throughout; as a matter of fact, I vape less now than I did when I first received the kit 3 weeks ago, so that cannot be the problem. As I understand it, the 10 sec. cutoff manual batteries were first-run production units, so I can assume that there may be issues with a few of them. Has anyone had a problem with their manual battery holding a charge?