En faisant une petite recherche, je viens de tomber là-dessus:
"At last - a fully functioning compatible LP-E6 battery!

Unlike earlier versions of LP-E6 compatible batteries, the new Phottix LP-E6 battery is fully compatible with Canon EOS 5D MkII ,7D and 60D cameras. It can be charged using the original Canon charger, and functions in exactly the same way as the original Canon LP-E6 battery.

The same voltage and capacity as the original Canon battery, only made by Phottix rather than Canon - hence the considerable cost saving!

The LP-E6 battery is suitable for Canon EOS 7D, 5D MkII and 60D"

Ce qui expliquerait le commentaire de mouzhik et peut être les problèmes de CoQuille et de Chti Leo