MNKE batteries are the definitive battery for the mechanical-mod user. Not only are these the safest batteries available, they also perform better for a longer period of time. The high amp-limit on these batteries means you can build sub-ohm coils without fear of the batteries venting. These are 3500mAh batteries, and can hold a charge above 3.7-volts for much longer than other IMR batteries, which means hours of use before needing a charge.