The  Green Sound EGO III 3200 mAh battery  has an amazing 3200 mAh capacity and is of exceptional quality. The GS 3200 mAh battery is well-made and only 2.5mm wider than regular 2200 mAh batteries. Despite this, it features a remarkable 3200 mAh capacity that should keep you vaping all day. Most users will find this to be a perfect spare or replacement battery because the batteries are compatible with all 510 fitting devices.