Mystery 4.2V 2650mAh 25C Lithium Polymer Rechargeable Battery for R/C Helicopters

Pros: Great battery for 450 class heli. Normally all batteries of these dimensions are 2200 mAh , so I was a bit skeptical at first. The battery dimensions are exactly as described, and not only she is 2650 mAh she actually takes more like 2850 mAh. I was able to extend my flight time by about 3.5 minutes.
Battery gets a bit warm when you run it hard, but nothing out of ordinary.

Cons: I had about four flights on this battery now, and my feeling is that she is not quite putting out 25C. I do not have a good way of measuring current output so I could be wrong.

Other: Very good battery for 450 size heli. Will work well for normal flying around and moderate 3D. Hard Core 3D not sure. Bottom line buy it, I know I will buy more.

Pros: I initially left pretty positive review for this product. The battery was taking more mAh when she was rated for and was performing pretty well but it all changed after about 15 flights.

Cons: After about 15 flights the battery started to take less and less charge and one of the cells started to puff out. Now after about 20 flights one of the cells turns into the jelly donut after each flight. I do not think I’ll be using this battery any more.

Other: If I would have to do this again I might get this battery for a plane but for a heli I do not think she can hack it. So decide for yourself.