The TP Extremes are one of the best batteries I've seen.

In fact the past 2 weekends in a row I went out to the track and have been driving my X-1 CR on an approximately 1.5 year old Extreme V1 3s 25C 2070 pack and it runs fine. The only problem with that setup is that the battery is too small both in cells and capacity. But, it's just to test the buggy and it gets me about 10 min. After I run that battery to the 9v cutoff it's a little hot but it stays balanced throughout the entire charge period.
The other battery that I ordered will be a lot better suited for the job (TP extreme 6s 3850). I figure I should get around 45-60 minutes with that pack.
Heli guys swear by Thunder Power's Extreme lineup including myself.
tc3_racer_001:
Who told you the Extremes were bad batteries?