Alright so when I bought my 510 I used both e-cigs with the charge they came with, then let them charge for 8 hours and used them. My question is, do I have to charge them for 8 hours each time or will roughly 1 hour be enough to get a full charge and keep them good? Just curious, I usually let them sit on the charger until ready to use the next battery, so there's always one on the charger for a few hours.