Dell G5 vs G7 Battery life

In the reviews on notebookcheck, the G7-8750h manages a battery life of 7,5 hrs on the video test, the G5-8300 only manages 6,5 hours.
The battery is supposed to be the same 56Wh 4cell.
How come the G7-8750 version gets a better battery life than the G5-8300 version. The rest of the hardware is supposed to be the same.

I'm looking to buy a G5 with 8750h, 1060MQ. What battery life could I expect?

 

I would ignore most battery claims since it is highly dependent on how well you have your O/S setup and tuned. If you know what you are doing you will get maximum battery life out of your rig for your specific use case.

WattHours and Watts are what they are. You just gotta know how to tune your rig to stay within the power constraints desired for your use case and the rest will fall into place.

The next biggest differentiating factors are: screen model, backlighting levels and efficiencies, undervolts, and disk drive/ram power consumptions.

I have almost always gotten more battery life out of my rigs than what is usually claimed, but I spend a good amount of time and effort tuning and tweaking my entire O/S for efficiency.

 

https://www.notebookcheck.net/Dell-G7-15-i7-8750H-GTX-1060-Max-Q-Laptop-Review.317686.0.html

https://www.notebookcheck.net/Dell-...060-Max-Q-SSD-IPS-Laptop-Review.312816.0.html

The two reviews in question, afaik.

Two months apart, different Nvidia driver versions, undoubtedly newer drivers for other components and maybe even better power management software. The G5 review occurred closer the release date of the G5/G7, so less mature drivers may have been at play here.

That being said, anything could have happened. Also, as @Maleko48 noted, the actual power draws were most important. The older review noted 8.5W average idle power draw, the newer review has 7.6W idle power draw. That being said, the NBC test criteria make them less comparable (especially since the three power modes NBC used to utilize don't really exist anymore).

Furthermore, looking at the NBC wifi test criteria:

https://www.notebookcheck.net/Our-Test-Criteria.15394.0.html

It's a little vague on what exactly is the Wifi surfing test. Is it loading a preset list of websites over the internet? Is the browser version consistent? Are the websites frozen in time, or does the content change over time (e.g, do the websites now have more multimedia content? More javascript ads?, etc)? Is adblock being used to filter out the wider variability of advertisements and their impact on web content? Is the distance to the wifi router consistent across tests? Is the wifi airspace consistent over time (are there other wifi networks in the area that may cause interference, and is that interference consistent across time)? Is the weather the same? Higher ambient temps may cascade to lower efficiency overall.

Those are just questions I have thought of as I'm typing this while watching the TV over the past 3-4 minutes. I'm sure there are many potential variables I haven't noted.

The point is, the battery life tests are better at ballpark estimates, but unless if they were compared side by side on the same day, at the same time, with some way of isolating them from the effects of each others tests, then I don't see the being completely comparable.

 

Tune your machine to use 10W max w/ThrottleStop and get ~5+ hours battery life.

Tune it to use 5W max and get 10+ hours battery life.

Depending on what the sustainable clock speeds are at those power levels, your average power consumptions will be at or below those maximum limits which will in turn increase your actual battery life further since average power usage is more closely correlated to actual battery life.

There is an optimum point in the power consumption vs cpu speed curve. Lower CPU speeds use a bit less power but must stay in their higher ranges longer whereas faster CPU speeds use more power but can exit their higher consumption states quicker since they will process the load faster.

 

Actually a bigger battery will double the battery runtime and tuning like @Maleko48 and @jeremyshaw said will net you even greater battery life.
Then again, your battery will last based on the apps you installed just like Smartphones or Tablets!.