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1/2AA Rechargeables
One thing you might want to try is 1/2AA rechargeable batteries, and then just use four instead of two in the controller. This gives you even more voltage than alkalines, and with nimh batteries, the controller batteries should still last a while between chargings. Of course, I don't know the limits of the controller, but who knows? This might boost range as an added side benefit. The only thing is that 1/2AA nimh batteries are a little hard to find.
-M
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