Originally Posted by JorgD

I have both the Yeah 3200 and 4000 batteries as well as several other brands. After cycling them 5 times I test their capacity.

The 3200's always have just over 3200 capacity when discharged at a constant 20 Amps.

The 4000's had 3500 capacity when discharged at a constant 20 Amps.

I thought the 3200's were exceptional value but the 4000's cost a fair bit more than the 3200's and have nothing like their stated capacity. Tomorrow I am going to verify the 25C claim. The 3200's easily sustained their 20C claim.

I am not all that surprised that the 4000's do not even have 90% of their claimed capacity as they only weigh 14g more than the 3200's and you can't get capacity out of thin air. I would not be surprised if they can't handle 25C either, but I won't know that until tomorrow.