Had to replace mine since my Nalu was only getting 3 miles on a charge. This does seem to be a 136.8 battery, but for whatever reason when the new one came in, it was labeled as 99wh. I weighed it against the old one and the weight matched and support told me it is the 136wh version, so im pretty sure it is. Backfire needs to update the stickers on these though to say 136wh and not 99wh though. Other than that, it works!