+1 on the evic I love mine it turned my mvp 2 into a backup
Welcome DonMac! and...Ditto on the eVic, and I also ordered an eVic easy head as a back-up. You can get the eazy head controller w/battery & cover for less than $40, makes a great back-up. They're both a little big though. For a mobile device, you can't go wrong with joyetech ego-c upgrade batteries and a Vision Mini Vivi Nova, or Kangertech Mini Protank 2. My
