I don't know where you bought it, but the specs I found on amazon and ebay both say 1C charge rate. Did the packaging say that came with the battery say 2C?Ran my new HRB 5000 mAh 50c 6s lipo yesterday for the first time. Based on video recording time, I ran about 17 minutes before damage forced me to stop. Checked the voltage when I got home, and all 6 cells still had 3.76 volts or better. I imagine this would mean there's still a lot of run time left, which is very appealing. I'll time the remainder on the next outing this afternoon. It took 45 minutes to charge from storage when they arrived, using my Hitec RDX1 pro set to 10A. I charged at 2c, but need to confirm if the battery specs will allow me to continue to do so.