I bought 2000 mah batteries before but they were not true 2000 mah like these. Those were even worse than what came with the controller. I bought 2 of these batteries and have been using them for over a month with daily use. I love these things. The only thing people should know is they will have to modify the battery tray in the controller. I took a razer blade and carved out the plastic pieces that got in the way, then it fit perfect.. no big deal.