Not really related but I was using my laptop with a little constant power usage (say 15% CPU and 40% GPU) and battery drop was 1% a minute (at 80% charge limit). First time I’d really done a little heavier lifting with it.
Quite surprised how fast it dropped. Especially as I have switched off the turbo boost so the highest it goes is 2.8GHz.
Battery of 1hr 20m at 80% ???
How long did you run it for to get a reasonable average as my math shows the possible discrepancies over a 1 min interval.
It could be from 79.5 (rounded to 80) to 79.4 (rounded to 79)
It could be from 80.4 (rounded to 80) to 78.5 (rounded to 79)
So between 0.1 and 1.9% with only a 5% chance of it being 1%
I’m sure that means something to someone. 
It was dropping around 1% a minute on the several occasions during the work I monitored it.
Full charge capacity at the moment (after a full discharge / recharge cycle): 52,853 mWh
So that’s at 3.9% wear.
Cycle count: 38
(First powered on: 10 months ago)
@Kieran_Levin, I noticed the following behaviour, not sure if it’s expected by design:
Laptop battery was intentionally discharged, fully, by letting the laptop stay on…till it ungracefully powered down. All good so far. Then, upon pressing the power button, the power button was flashing red, and the laptop didn’t come on. Still good, as expected so far. Plugged in USB-PD expecting it to charge. Came back an hour later. Powered on the laptop. But it’s only at 2% charge. It’s as if the laptop didn’t start charging until it was power on. This was unexpected. (On BIOS 3.09)
Expected behaviour: When the laptop’s main battery is fully depleted, and the laptop can’t even complete a POST, the laptop should be able to start charging the battery when USB-PD is plugged in, with or without the laptop being powered up.
I have 3% battery wear, daily use since the start of the year for 2-6 hours each day.
Just adding some thoughts
Again these figures are not relevant to use.
1000 cycles before 20% ~ I don’t think so
At 4 hours a day (6 x 0.67 for battery drain whilst plugged in) I000 cycles will last me 8 years before a loss of 20%, so highly unlikley…
Ok if my maths are wrong my excuse will be my age.
But the facts are 5% loss after 5 months and 48 cycles down with 6 hours of plugged in use.
Update Aug 11th
For the last couple of weeks I have been uisng the laptop plugged into power for around 6 hours a day. Unsurprissingly and thankfully there is no shown wear. Today I charged to 100% from my usual 78% and as I hoped the wear has recorded a dowward trend. This has happened each time I charge to 100%. Then for a few days after it takes a while to stabalise.
Below is a graph of data from when I received, initially I wasn’t recording data so exptrapolated some from old data.
I won’t annotate the graphs as they are fairly self explanitory.
I don’t think the battery wear information can be very accurate in general, 11 months on my computer shows 2.6% wear at 53577mWh. I never lowered the max charge and use the computer in my classroom 5-7 hours a day from last October through July.
I think these are only accurate to within a few percent, because there’s no way I have lost 1.3% of wear since I posted 6 months ago.
Just thought I’d throw my anecdotal two cents at everyone, anyway. Can’t complain that my battery is reversing it’s wear, but here’s hoping the thing isn’t lying.
HWiNFO64 7.22 (I know it’s old, but I prefer consistency, no sense updating if it works and hardware is unchanged) and Windows 11 on 1135G7 for those wondering.
Edit: corrections above and whoa 100th post. I’m such a child for being excited about it.
Is it always used on mains and what about the cycle count, could you relay that. 2.6% in 11 months is very low 
Have you calibrated the battery. Mine, after 6 months is reading 6.8% and has shot up in the last week from around 5%
I’m going to do a calibrate on 1st Sept to see what changes it makes
Update:
I have been running on battery far more, though with a lower 75% charge limit. Probably another ~100x 75 to ~25% cycles in the last two months.
After charging to 100% and letting it float down to 80%, then back to 100% 3x times today (to let the charge controller figure things out), I am getting 3350000/3572000 health (as reported by cat /sys/class/power_supply/BAT1/charge_* ), or 94% of rated capacity. This means around 4% capacity loss in 4 months since my last measuring and posting on this in April.
Others have said that the battery state of health calculations might be a bit inaccurate, and my suspicion is that this is true as well. Not sure how to improve the accuracy of the reporting, either installed in chassis or through bench testing, but it might come to that if we need better degradation data.
So that’s 50 cycles. I have only done 51cycles in six months with 7% loss of capacity.
Not sure that is going to work. To calibrate the battery it will have to be taken down as close to zero as possible and up to 100% for the calculation of what the battery can hold.
Calibrating mine later today
Calibration seems to be a big issue.
Over ≈7 months I have calibrated the battery reporting algorithm 3 times and each time the result shows lower wear. So much so that each successive time the wear been reported as dropping.
This would also make sense if the discharge to zero and recharge to 100% ‘stretches’ or conditions the batteries capacity.
The other note is that the battery cycle increases as expected.
Updated 1st October 2022
NOTE: A ‘recalibration’ cycle was carried out on the 1st October and yet again the wear is recorded as lower ???
REF: Compare to original graphs
I am at 98.2% after about 7 months. Running Ubuntu 22.04.1 spending a lot of time on power with a charging limit set to 80% and running on batt about once per week and getting around 6 to 7 hrs use from the battery. 
An update:
I just updated HWiNFO64 and the wear jumped from 4.3% to 4.8%
Update 22nd > back down to 4.4% See two posts above for graph
The application doesn’t seem that reliable. I’ll try and check via Ubuntu to compare.
I was in batch 3 and was using mine daily for a day short of an entire year now (Got it Sept. 29, 2021). I’m at 89% capacity so 11% wear.
I’ve been using it daily for college and work and charging to 100% and usually using it until it’s around 20-30% charge though some days I went as low as 5-10% due to not having access to a power outlet.
Batch 2 i7-1165, 97% battery health remaining. Semi-regular daily driver. Charge to 100% and drain from there. Variable drain lengths before re-charging depending on how long I know I’ll be from a wall socket.
Mine is from the first I5 batch
POWER_SUPPLY_NAME=BAT1
POWER_SUPPLY_TYPE=Battery
POWER_SUPPLY_STATUS=Charging
POWER_SUPPLY_PRESENT=1
POWER_SUPPLY_TECHNOLOGY=Li-ion
POWER_SUPPLY_CYCLE_COUNT=96
POWER_SUPPLY_VOLTAGE_MIN_DESIGN=15400000
POWER_SUPPLY_VOLTAGE_NOW=16874000
POWER_SUPPLY_CURRENT_NOW=0
POWER_SUPPLY_CHARGE_FULL_DESIGN=3572000
POWER_SUPPLY_CHARGE_FULL=3028000
POWER_SUPPLY_CHARGE_NOW=2753000
POWER_SUPPLY_CAPACITY=90
POWER_SUPPLY_CAPACITY_LEVEL=Normal
POWER_SUPPLY_MODEL_NAME=Framewo
POWER_SUPPLY_MANUFACTURER=NVT
POWER_SUPPLY_SERIAL_NUMBER=xxxx
So I guess I’m at 85% of the design capacity after 96 cycles
Yes, I have capped it at 90%
Batch 8 so still young
If you look at my graphs you will see an improvement in wear each time I do a complete discharge and charge to 100%
Out of curiousity could someone answer how accurate wear is?
Also wear to my knowledge is hard to calibrate correctly.
Not accurate. At the end of the day, what you really / actually care about is how long you can use your laptop for, per charge. That’s what really matters. Wear level is just a rough guesstimation.
It’s like…mileage of a car…it’s not exact…and what really matters is you want to know if your car will crap out on you, and how much it’ll cost to fix the issue. Mileage is just a rough indicator of likelihood of potential issue.
Or age of a person…you get the idea…
From my test that seems to be true
MC divide by DC will indicate the wear on the battery in terms of capacity.
Other wear is harder to assess
Heat damage by fast charging may be breaking down some insulation and that sort of wear is more difficult to assess. One way of measuring it would be to measure the battery charge low when not powered on.
This type of degradation id more often liked to the cycles that a battery goes through.
So we have wear as in capacity (CA) and wear as in cycles (CY)
I’ll let someone else find a formula for their interaction
