less than $30 for a 5700mah Lipo with enough punch even for 4wd, let alone 2wd; will last you close to 30min on 1 charge! 
http://www.hobbyking.com/hobbyking/s...r_Lipoly_.html
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Ansmann ARE-2 - 5.5T
C4.1 Centro - 7.5T
X-Factory SCX-60 - 10.5T
Hyper 9e - MMM
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