Currently I use as my productivity working device a Tuxedo Laptop, the Infinity book pro 14". It is about 1.5yrs old and started acting up in december when it comes to battery. The Battery sometimes was overnight discharging to 0% even the laptop was powered off.

Also it showed a reduced maximal capacity. In Linux you can check your battery stats quickly with upower -b the old battery looked like this:

native-path:          BAT0
vendor:               OEM
model:                standard
power supply:         yes
updated:              Wed 21 Jan 2026 02:01:39 PM CET (7 seconds ago)
has history:          yes
has statistics:       yes
battery
  present:             yes
  rechargeable:        yes
  state:               fully-charged
  warning-level:       none
  energy:              64.68 Wh
  energy-empty:        0 Wh
  energy-full:         64.68 Wh
  energy-full-design:  80.08 Wh
  voltage-min-design:  15.4 V
  capacity-level:      Full
  energy-rate:         0 W
  voltage:             16.795 V
  charge-cycles:       69
  percentage:          100%
  capacity:            80.7692%
  technology:          lithium-ion

The important thing here is energy-full: 64.68 Wh which is way too low; it should be ~80 Wh. So a loss of 20% capacity in only 69 charge cycles. Well, I am honest-I mostly use the laptop docked on constant power. But when I go to events, I need to rely on it. The biggest issue, besides the smaller capacity, was this weird random discharge, so after checking everything, even reinstalling another OS for testing purposes, it still didn’t fix that. So my rough guess was the battery.

Luckily the people at Tuxedo Computers did not hesitate long and also did not require me to send in the laptop (which is a no-go for me because daily need) - they sent me an advanced replacement battery.

So I exchanged the old one with the new one. This I love about the Tuxedo laptops, they’re so easy to access. 6 screws, and the full back pops open. Unfortunately, I needed to remove the M2 Drive to acces one of the two more screws for the battery, but that’s it - old one out, new one in.

Open tuxedo infinity book pro for battery change

After changing to the new battery the upower -b looked much better again:

native-path:          BAT0
vendor:               OEM
model:                standard
power supply:         yes
updated:              Thu 22 Jan 2026 08:39:56 AM CET (22 seconds ago)
has history:          yes
has statistics:       yes
battery
  present:             yes
  rechargeable:        yes
  state:               fully-charged
  warning-level:       none
  energy:              80.08 Wh
  energy-empty:        0 Wh
  energy-full:         80.08 Wh
  energy-full-design:  80.08 Wh
  voltage-min-design:  15.4 V
  capacity-level:      Full
  energy-rate:         0 W
  voltage:             16.654 V
  charge-cycles:       N/A
  percentage:          100%
  capacity:            100%
  technology:          lithium-ion

And surprise, after night the battery did NOT discharge itself into nirvana. I left it with 100%, powered it off, and when I powered it on this morning it was still 100% as it should be.

Yay, happy battery again.