I cannot recommend Canon NP_E3 batteries. I bought a brand new NP-E3 genuine Canon battery about 5 weeks ago now, and it's a dud. I get around 120-130 shots her charge (and yes, I've done the refresh/charge thing etc). Canon Australia have tested it and said that it's within 'spec', and that a bunch of other NP-E3 batteries off the production line that they tested were all within the 120-130 range. This is absolute bull****, they should be doing 300-500 on a full charge with my 1D. I intend to take this up with the NSW Department of Fair Trading and have Canon done for false and misleading advertising.
I cannot recommend genuine Canon NP-E3 batteries, don't waste your money, buy the 3rd party ones for a quarter (or even less) of the price, and better performance, rather than pay the CHFT (Canon hostage fee tax). Stuff the weather sealing bull**** as well. Canon is damn well lucky that it's not financially viable for me to switch to Nikon, otherwise I'd most certainly have switched after their totally ******* treatment of me.
I'm not a happy camper, and will do everything in my power from now on to badmouth Canon products.
Dave