I bought two of these batteries for the 5D Mark II and confirmed that the camera CAN read the battery life remaining from these "decoded" or chipped batteries.
Decoded Battery LP-E6 LPE6 for Canon EOS 7D 5D Mark II http://item.ebay.com/330446927656
Decoded Battery LP-E6 LPE6 for Canon EOS 7D 5D Mark II http://item.ebay.com/330446927656