I've used Eneloop 5 packs for 6volt equipment but for sustained output for my EQ platform, I use a 3S-11.1volt LiPo which runs the 12v drive for 2+ hours. A 4S-12.8volt LiFe works pretty well also. The advantage of lithium batteries is that the output voltage remains effectively constant until exhausted in a small compact package, the disadvantage is that they deliver huge currents if shorted which can easily start a fire. See the Hobbyking website. You will need a charger which will handle these types of batteries but once you try them, you probably won't go back to NiCads or NiMH.
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