Just got my "The Vapor Girl" mini Echos. They are not as short as I thought they would be for only 350mah. They are 57mm/2.25" long. A 650 mah is 65mm/2.5" long. Only a quarter inch difference, and 300mah less. They are sealed, stealth, and have a nice rubber coating. They have a ten second cut off.
I got four, and one the light comes on, and stays on when a Echomizer is connected. I'll mess with the post latter to see if this fixes it. The rest vape great as any Echo.
They came fully charged, and "The Vapor Girl" threw in 4 free chargers. She also wrote a realy nice letter of appreciation.
If the one that doest fire right doesn't work, I am not upset, as I basically was given 2 full kits for the price of 4 bats. And I'm an pretty sure messing with the post will fix it.
I'll keep this updated.