I recently purchased a 1DIII. The battery is original Canon and show 3 green bars of recharge performance. It goes down to under 20% with 1100 frames and a lot of chimping. That is kind of borderline to getting through a heavy day of a 6 year old's games and such.
I checked Amazon.com and found DSTE and Wasabi. Both have enough bad reviews to scare me a bit. The LP-E4n is $180 and the LP-E4 is $110. I searched here on POTN, but everything is over 2 years old. Can anyone recommend Wasabi or DSTE? I use Wasabi LP-E6 in my 6D with no problems.



