These batteries are amazing and they for perfect in any traxxas such as the Usr, E-review2.0 vxl, Xmaxx, although they are a little small for my X0-1/X-01 LOL. Also a great run time.
These batteries have plenty of punch and so far am happy with them.
I've been using them in my Traxxas UDR for a while now and they're hands down the best batteries I've used. They balance perfectly and hold a charge way better than Traxxas ID batteries.
Pros. Lots of power and the battery life lasts a long time, I've built an all-aluminum RC monster truck that's a heavyweight with a high torque brushless motor and this battery delivers a crazy amount of juice Cons, will destroy ESC and motor in minutes if your RC machine isn't geared and set up for a high discharge battery.
Ovonic is the best bang for your buck.
Great battery life, cells are balanced as they should be, plenty of power for my Castle Creations Brushless system. I have yet to completely drain these batteries, they just keep going!. Overall, for the budget, this really is an amazing choice. These fit perfectly in my Hpi Vorza tray now that I have removed a little bit of foam. Very Satisfied with my purchase up to this point. I will update you if I encounter any issues!