I'm having some trouble with my batteries charging. So far, this issue is only with my V4L batteries, both original diamond series and titan, and occurs with both the original and slim V4L chargers and other brand 808 chargers, and began occurring with all of them at the same time, so I really have no clue what the problem is. Basically, I use the batteries until the vapor production drops off, put them on the charger, and within minutes, the chargers indicate that they're fully charged. Then, the batteries die within half an hour or less, and the vapor production never amounts to much. I've cleaned both the batteries and the chargers, so... what gives?