Best 510 autos on the market
Review by Jeffon 11/27/14
Nothing bad to say about these amazing batteries. They put out 4-4.2 volts making them a more powerful alternative to standard 510 batteries (typically 3.2v.) Instead of gradually weakening during use like other batteries, they keep the voltage rather regulated until there is no more power and the LED lights 3x. They charge quickly and last me over a year. I keep 3 on me which is probably equiv to almost a pack of cigarettes in terms of drags. Highly, highly recommended!