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I'm not an r/c or battery expert but I have an idea on a why it might have fried your ESC but I wouldn't know for sure. I looked at the URL you posted for the battery you bought. The site says :
These cells are voltage Enhanced with our exclusive "blasting" process which lowers the internal resistance and raises the average voltage in the cell giving it more power.
Ok this pack is rated for 7.2v but it has a "blast process" which "raises the voltage" basically. I read that the stock ESC in the DRR can only take up to about 8v. It's possible that the pack puts out more than 7.2v and maybe it peaks out over 8v or something and that's what zapped it. But like I said I'm not an expert. I hope you get it fixed!
Ryan
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Black NSX GT1 Dynamite Rocket Racer
7.2v BLiND Batteries Battery Pack http://www.blindbatts.com
HPI Micro RS4 Mod 45T Motor
HPI Micro RS4 14t Pinion
ABC DTM Bearings
ABC DTM-SP Foam Tires
Dynamite Aluminum Body Posts
Foam Insulation Home Made Bumper
31MPH or 50 km/hour 
Green Lamborghini Murcielago MicroSizer
      
Rare Earth Magnets & Steering Spring Saver Mods
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