This post is specially for you since you asked. Maxpower do manufacture the hard case lipo, the round type as below. Picture borrowed from TP Racing online catalogue. Maximum mAh can only max at 4000mah and 35C for the size. Suitable for M-chassis. 30 days warranty on the height of the battery will not expand more than 3mm from original size.
The further below is a sample of what i'm using and we are gaining confident from the touring guys as of now. The OUT OF STOCK until this coming 25th It is the PRO series with 90 days warranty on the height of the battery will not expand more than 3mm from original size. I'm using the 35C of this series. :)
We encourage user to use good charger and swithing power supply with it.
It can withstand to be charge at 4C rates. Approximately 25AMP charging!
Once you tried Maxpower, you'll know. :)