Hello everyone, I just got a Nikon D3000 for x-mas and I'm having so much fun with it. I noticed the battery really drains fast when I'm using flash. I am thinking of buying an extra battery but don't want to pay the top dollar price of the Nikon battery. I noticed that all the aftermarket brands have a voltage of 7.4 while the one that came with the D3000 is 7.2. Does this make a big difference? Will I be ruining my camera if I were to buy the cheaper ones with 7.4V? What is your opinion on the topic and does any one already have any experience with this. Thank you all in advance!