7D/5DII Battery life .... what's your experience?

First this is not a bashing thread of any sort .... use some intelligence & be nice. This is my honest experience! Let's share

I have had my 5DII & 7D for almost 2 years & both of my Canon batteries are charging to about 90%. 2 batteries I got on Ebay at the same time are still reporting 100% & last a lot longer?? I rotate my batteries consitantly. These batteries cost me about $7 each & came with a charger.

Opinions are welcome as to what I should replace my Canon batteries with

Cheers
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http://www.JonSmithers.com GtoJon -
Taken any photographs lately?