I have at the moment 14 working Ego batteries all from FT. One non-working 650 maH from fasttech and 3 NON-working 1100 mAh batteries form another vendor. Considering I paid 3 times as much for the non-working batteries from another vendor, I am VERY pleased with all my Egos purchased from fasttech. I have another 5 pack of 1100 mAh on its way now...https://www.fasttech.com/products/1353105. Considering that they were only $5 and change per battery, I had to order another pack.