I've got a 7D with the LP-E6 battery that came with it, but would like to get some spares (along with a battery grip)
With my previous camera (450D) I used generic batteries (and generic grip) and had no issues with charge/usage, but apparently the LP-E6 batteries have a proprietary Canon chip in them, which means that there may be problems charging or using (in terms of battery metering) in a 5D or 7D body.
What are the specific problems? And are there any 3rd party batteries that have the Canon chip or a reverse-engineered chip to avoid these problems?
Answer
I haven't yet found any third party batteries that has a chip in them.
As you say, using a battery without the chip doesn't provide the camera with power level metering. Not knowing exacly how much power there is left is of course a bit inconvenient, but that can also cause other problems. The camera uses the power level information to shut down safely when the level gets critically low, and without that information the camera might run out of power in the middle of an I/O operation. If you are shooting pictures the risk for that is not very high, but if you are shooting video when the power runs out that is quite likely to corrupt the video file. It may also corrupt the disk system data, which will make all the files on the card unreadable.
The third party batteries I have seen comes with a special charger, as they can't be charged with the original charger. That means that you have to bring two chargers if you have both types of batteries.
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