Yes, that's true, and it makes sense for preserving the battery. I started the thread because some people over on reddit were concerned that their chargers weren't providing enough power to the batteries, only around 20 watts rather than around 40 watts. I'm guessing they were seeing that because they were looking at the charge when the batteries were at greater than 90% charge.All cell phones work like that.
If you have an Android device you'd could try and find charging dataligging apps in the Play Store.
Interesting... I would think that you'd be seeing a significantly higher charge rate with your base battery so low. So, yes, that does seem odd.Hi! I got my Surface Book 2 15" 1060 some days ago and tried some gaming to see how it performs. Unfortunately I had MASSIVE battery drain (like 10% in 15min). I saw this thread by searching on google and tried to run BatteryInfoView (thanks for the hint!).
This is the result:
After running the application for some minutes it seems the charging won't go above 20Watt in total. That is pretty low, isn't it?
It feels like the power adapter doesn't work or is broken and doesn't deliver the energy by far (especially in gaming).
Anything I can do?
Yes, unfortunately, I think you're seeing the behavior that kicked off that reddit thread that I referenced in the OP. When the battery is sufficiently low, you should see 40+ watts charge rate (when the dGPU isn't being used) until it hits around 90%, at which point the charge rate will slowly fall to less than 20 watts until it hits 100% charged.So... I'm already back and I had the possiblity to check the battery consumption. The battery consumption when not-gaming seems to be normal. But now I'm charging the battery at around 50% and I still don't get more than 20 Watt in total. I also tried gaming with battery-only and after half an hour my base battery went down from 100% to 35%. Doesn't seem to be a normal behaviour - so I probably have to exchange my notebook + ac-adapter. Damnit
That's interesting, but it doesn't answer the main issue identified in this thread. Here, we're talking about when the dGPU is NOT being utilized, and a limited amount of power is being delivered to charge the batteries. On my SB2 15", over 40 watts is delivered to charge the batteries when they're low enough, but on some SB2s, apparently, including spcial's, around 20 watts is delivered.I asked the Program Manager in charge of the Surface Book 2 about this week and here is what is happening (it is by design). The SB2 15" Thermals were actually quite a bit better than they anticipated and allows the CPU/GPU to run at a much higher wattage so the Power Supply will give the CPU/GPU the power without throttling rather than the batteries up to a point - it will only allow the battery to go down to ~30% and then it will start charging the batteries by slightly throttling the CPU/GPU. Their tests show that the throttling would be the equivalent of moving from 60fps to ~54fps....
Hope that clears that up....