No problem. In my experience it's better to buy one good/great battery and save weight. I have one D3100 in my car and have absolutely zero voltage issues with two 1000D's and two 50.4's. I'd rather have less weight and stable voltage than more weight and stable voltage.
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Electrodynamic
Don't install suckage!
Power handling is not a power requirement!
Simon Eichenberger is the man.
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