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- Martin
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hi guys, just wondering if its ok to run 2 different mah batteries in the 7D's battery grip (not a canon grip) say for example 1 1500mah battery and one 2800mah battery? or do they both need to be the same mah rating? say x2 2800mah batteries? thanks in advance guys 
thanks simon, looks like i need to buy some batteries that match mah rating then