I previously mentioned in a post that the battery almost certainly will have additional anti-counterfitting measures, and that future camera firmware upgrades may put them into place.
There is a distinction between a battery that claims to be a genuine Canon battery, and a third party battery that lists its own brand. Canon firmware asks if a battery is branded Canon , and locks it out as counterfeit if the user responds yes. If the user says no, then he can use the battery.
The issue is that the firmware seems to be unreliable and rarely detects genuine Canon batteries as counterfeit.