It's 350 for the 78mm, I've read that multiple places.Plus the Volt has a 7 second shutoff timer (awful) and they don't tell you the mah of the batteries (which I suspect is 180mah).
I'm a fan the Twist and will get other big things in the future, maybe a Lavatube. But I'm willing to refill cartos. But NO WAY was I interested in that for the first 2 months!
If his Mom wants a simple automatic battery AND prefilled good-tasting cartos, with the ability to move up to a 650/900/1300 mah battery later on (especially if automatic is desired in the big batts too) then Volt (the bigger the better) is the way to go. They also come in "X2", same as the little ones but 650/900/1300 mah.
You don't need a kit or PCC unless you're out and about. I admit, *I* plan to be out and about at 65! But really, his mom is probably wrong the same way I was wrong at first, and if it's analogs or beginner stuff, beginner stuff is better.
Also, the twist is impossible to read for me even WITH glasses at age 60. (I had to put nail polish on the markings, color-coded)
If the OP had not said pre-filled cartos are a must (which made me think she'd also hate manual batteries despite their clear superiority) then I'd agree with Shoga Ninja.
Be aware that 808 and 510 are different worlds and the adapters have NOT worked for us with automatic batteries.
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