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I imagine when you say "Energizers" you mean the Alkaline ones.
Someone can correct me here, but by its' nature, Alkalines don't have near the discharge rate as NiMH rechargables...So you're back to the original problem (overheating).
Check our your local hobby shop and even RadioShack and some department stores that sell RCs (Walmart, Target, Kmart, etc...) for what they have with 7.2v RC NiMH Battery packs (obviously you'll be looking for anything 2000mah or higher).
Good luck.
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