Like Energizer® bunnies of the e-cig world, these batteries offer a smoke that lasts and lasts. With 280 milliampere-hour (mAh), each battery provides the endurance to power you through an entire cartridge on one charge. Other companies offer weaker batteries (90 to 180 mAh) or charge extra for the same strength. Not us. We made them standard in all of our products. How’s that for value?