Sanyo distributes batteries intended for the mechanical MOD as well as the electro box of quality.
Battery 20700 4250mAh by SanyoThis 15A 4000mAh NCR 20700B flat head Japanese battery is the latest design in high capacity and high drain batteries. The increased dimensions allow for longer battery life and amperage compared to smaller cells, increasing safety and ease of use. made by Sanyo. Sold individually.$19.99