Panasonic NCR 18650PF-2900mAh 3.7V high-drain LiMn battery-Flat Top - - I've had them for 2 1/2 years. They were $11.99 each when I bought them, but I think they're cheaper now.
Absolutely not good for vaping! 10A discharge rate, and I'd be taking that with a HUGE grain of salt. Can't believe a vaping vendor is selling those.