https://shop.usa.canon.com/shop/en/catalog/battery-grip-bg-e22According to Canon, only genuine LP-E6N batteries will get charged in camera or in the grip.
The LP-E6 will power the grip, but does it actually charge them? It didn't with the grip I rented, but that was almost a year ago.https://shop.usa.canon.com/shop/en/catalog/battery-grip-bg-e22
It says here that both Lp-E6N and LP-E6 work with the grip. Where is there a canon post that says that LP-E6 doesn't? It works on all my LP-E6* batteries with firmware 1.0.1. Does it not work for you?
I kept on looking after reading your comment, since I expected that there was something. I did find a product advisory stating it would not charge from the grip. I have several LP-E6 batteries, but didn't know specifically which are in the grip. I just checked and they are both the N version, so maybe the old one won't charge. In any event, here is what I found from 1.5 years ago before the firmware update.The LP-E6 will power the grip, but does it actually charge them? It didn't with the grip I rented, but that was almost a year ago.