I ran both the D90 and D7100 on Nikon grips with 2 batteries in, and even if one of the batteries is exhausted you can continue to shoot with the other one. You can also do a mini-charge on a battery of 15 minutes or so, though it's always best to shoot with a fully charged one.
Re battery life...if you're shooting lots of bursts, or are out in very cold weather, or are using a flash a lot...all contribute to shortened battery run time.
Message edited by author 2014-03-19 08:23:28. |