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Microsoft Surface 3 battery charging time

About 4 hours from less than 10% battery. That's about one hour slower than my Surface Pro 2 with its custom charger at the same level.

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I've always used the charger and cable that came with the Surface 3 and I have not seen any terrible charging times. I went from 5% to full in under 4 hours yesterday. I wasn't using the Surface during charging, so I'm sure that helped. But 4 hours for a full charge seems acceptable. Is it the fastest charging device I own? Definitely not. But I don't think it is that slow to be considered an issue.

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Finally drained the battery on my Surface 3 today (wouldn't even turn on, battery symbol would flash on the screen). Charged it for 2 hours 45 minutes and was at 85%, took an additional hour to get to 100%, so roughly 3 hours 45 minutes from dead to full charge while the Surface is turned off. Not too bad at all IMHO.

source: https://forums.windowscentral.com/microsoft-surface-3/355747-surface-3-battery-life-charging-times.html

Battery report

Overigens kun je een rapportje trekken van je accugebruik. In een 'elevated' command prompt geef je volgend commando:
powercfg /batteryreport /output "C:\battery_report.html"

of zelfs een uitgebreide studie:

powercfg /sleepstudy /output "C:\sleepstudy.html"

In praktijk

laadtijd laadniveau
3h 45m 92%
4h  

96%-95%_78%
datum 3h 7h30 18h30
26/08/'19 100% 95% 77%
27/08/'19 100% 97% (6h20)  
28/08/'19     79%
30/08/'19     80%

'Over time', de laadtijd neemt niet toe, maar het 'dischargen' gaat sneller.
datum 3h 18h37-19h28
17/01/'21 100% 65%
18/01/'21 100% 69%
19/01/'21 100% 68%

So I've added a scheduled task that shuts the tablet down at night.
timestamp capacity remaining
22/01/'21 18:38 97%
A side-effect is that upon restart, the wifi connection is not always re-established. So I wrote a small startup script that checks if the connection is established, and if not, establish the connection:
ipconfig|find/i "123.456.789." && rundll32 || netsh wlan connect name=... ssid=...

This is a good solution, but once in a while, the laptop has been active during the day, e.g. after patch Tuesday:
  • 11/02/'21 05:19:11: 94%
  • 11/02/'21 18:17:53: 68%
I found the following article, https://www.reddit.com/r/Surface/comments/40cq4i/surface_3_battery_drain_and_sleep_study/, and have now:
  • disabled the 'wake by pattern match' setting of the wireless adapter
  • disabled the scheduled task that shuts down the tablet at night
I'm curious what the result will be.
  • 12/02/'21 18:02:21: 70%
That's a lot of drain. So I'm going to
  • re-enable the 'wake by pattern match' setting of the wireless adapter
  • re-enable the scheduled task that shuts down the tablet at night (23.30) and finetune it:
    • to repeat the task every 7 hours
    • for a duration of 8 hours
    • stop all running tasks at end of repetition duration
I suppose this will be of some help.
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