I was looking at prices of (genuine) Canon LP-E6 batteries and stumbled across the Hahnel HLX-E6. Slightly cheaper than the Canon and if you believe the claims gives around 25% more shots from a charge compared to the Canon.
Don't know what the camera will report regarding a serial number or performance but might be worth checking out. (Ask yourself how you coped prior to having that info available and I expect you'll say "just fine!")
Anyone been using the Hahnel?
http://www.hahnel.ie/index.cfm/action/batterysearch/pid/853
Update - I've e-mailed them to see if a 5D3 will register a serial number and give accurate recharge performance data. Will keep you posted.
Don't know what the camera will report regarding a serial number or performance but might be worth checking out. (Ask yourself how you coped prior to having that info available and I expect you'll say "just fine!")
Anyone been using the Hahnel?
http://www.hahnel.ie/index.cfm/action/batterysearch/pid/853
Update - I've e-mailed them to see if a 5D3 will register a serial number and give accurate recharge performance data. Will keep you posted.