I wrote to Canon pointing out the poor battery performance last week and I received a most unsatisfactory reply, following which they passed the complaint on further.
I've just had another reply from them which I find almost laughable in its content. A quote below;
'The Canon EOS 7D MK II has several new technologies built in, also many new advanced technologies migrated from 1Dx. Due to this large number of upgrades the camera energy need has increased.
If you compare the screen resolution of the Canon EOS 7D - which has a 7.5cm screen with only 920K dots - to the Canon EOS 7D MKII - has 7.7cm screen with 1040K dots - you can see that the 7D MKII screen requires more battery consumption compare to the previous model. If you look at the focus system of the Canon EOS 7D MKII you will find many similarities to the 1Dx. This more advanced focus system requires more energy, what also decreases the life of the battery. Whilst the 1Dx battery capacity is 2.5 times bigger compare to the Canon EOS 7D MKII, you can still take 1000-1100 shoots on a 1Dx, whilst you can take approximately 600-660 shoots on the Canon EOS 7DMKII with a fully charged LP-E6N battery – with an LP-E6 battery this number will be even lower due to the capacity of the battery.
My advice would be to lower the brightness of the LCD screen and use a Canon BG-E16 Battery Grip enforced with a second LP-E6N battery for the better result. '
I've pointed out to them that it appears from what they say they have brought out a camera with a greater power demand than the one it replaced, but that the upgraded battery they've supplied for it isn't up to providing the power for a similar performance to the 7D.
I've also pointed out that their solution of reducing the screen brightness would have little effect, since (a) the screen is put to minimal use and (b) I'm using a 2 second image review time, as compared to the 4 second image review time I used with the 7D.
I've also pointed out that their claim to over 600 shots on a charge also seems questionable, since before the current spell of gloomy weather set in I have had 119 shots on a fully charged battery on a non-IS lens with minimal unnecessary focusing and one single flash actuation. My battery charge level is now 66%, which indicates that I'll get around 360 shots on a full charge - I'll find out when the sun comes out again.
I've also told them what I think of their 'solution' that I convert my new £1599 camera into a heavier and more cumbersome £1927 camera by spending an additional £79 on a battery and £249 on a battery grip.