I’m out & about a lot, with no access to recharging of any kind?
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Make sure to get a mid-size model, they have batteries bigger than the minis. An eGo, Tornado or Riva for example. You can get 900mAh batteries that last around 8 hours. Two of those would fix it for most people. The minis, small cigarette lookalike models like a KR8 or regular 510, will need a PCC case to recharge them, and/or you'll need to carry several batteries around.