I just got my new Riva 510 SE starter kit Sunday. I of course decided to grab the first battery and fill up my cartos and start vaping. I also plugged in the other battery for the "recommended" 8 hours since i discovered it was dead. I plugged it up for 8 hours as the manual instructed and followed the instructions for after first charge. Well the first battery i was using that came with charge finally died so i charged it up as well following the instructions. I screwed in the carto to the battery i charged initially and started vaping. About 1 hour into vaping that battery died again, so once the other one was finished charging i went back to the original. It only took the inital one i charged 45 mins to "fully" charge. I decided to test it out and sure enough about an hour later it died again. So im confused, the first battery i started vaping on lasted a LONG time. The second one barely makes it an hour before it dies. Bad battery or something else?