There are also 1000mAh, 1100mAh, 1300mAh EGO (imitation, not Joye) out there. Kanger makes a 1300mAh unit in the KR808/901 fitting. Most of the actual manufacturers are making the larger PVs now. I'll be testing a new Boge 800mAh unit soon, and am trying to get my hands on the new Bauway 3000mAh unit coming out this week. In another month or two, they'll all have the larger mAh ratings, and the Joye 650/900 units will be left in the dust. The problem is the larger the mAh rated batteries inside, the larger the PV becomes. Keeping the diameter of the unit down to 14mm and under, and the length under 140mm is tough with those sized batteries.