4 ms·

Is there a good reason why we can't tell our devices to charge the battery to say 70% and then internally disconnect the battery, so it's neither charging nor d

Is there a good reason why we can't tell our devices to charge the battery to say 70% and then internally disconnect the battery, so it's neither charging nor discharging?

omgtehlion 3y ago
Some laptop manufacturers include this mode. At least I have it in lenovos (not exatctly 70%, they allow cap at 80%), and have seen in some samsungs years ago.
- bornfreddy 3y ago
  Where do you set this? OS, BIOS or some Lenovo control software?
  - paraselene_ 3y ago
    Lenovo vantage, under battery management or something like that. Has been an option for quite long.
  - arp242 3y ago
    On Linux you can set this in /sys/class/power_supply/BAT?/charge_{stop,start}_threshold – you can read and write a percentage (1-100) to there. You'll have to set it on every boot. I assume there's some way to do this in Windows as well, but I don't know it.
  - yjftsjthsd-h 3y ago
    At least one of those; depends on the device. As sibling comments note, plenty of devices expose it in software, where in Windows you use the vendor's utility and Linux puts it in /sys, but I've got laptops that either don't do that or I couldn't find it but I could configure it in the BIOS settings. So you might have to dig around a little.
dark-star 3y ago
Dell laptops have had such a feature literally for a decade now
- dns_snek 3y ago
  That's good to know, I guess I'm curious why it's not (nearly) ubiquitous. Does it add significant cost and complexity to hardware design?
- tooltalk 3y ago
  Yep. I'm using Linux on a XPS 13 and Dell provides Dell Command Configure, aka, cctk. I set mine to 65%. https://www.dell.com/support/kbdoc/en-us/000178000/dell-command-configure https://www.dell.com/support/kbdoc/en-us/000178000/dell-comm...
suprjami 3y ago
ThinkPad has this. My battery only charges to 75% and it must drop to 50% before it starts charging again. You can configure any value for either setting with TLP.
- smartbit 3y ago
  On my thinkpad the screen dims after 30seconds without keyboard activity when not fully charged. Very annoying. It happens also when connected to a charger. I regretfully set the bios to fully charge again to disable this auto-dim feature.
  - crtasm 3y ago
    Is the screen dimming not a setting in your OS?

Is there a good reason why we can't tell our devices to charge the battery to say 70% and then internally disconnect the battery, so it's neither charging nor discharging?

omgtehlion 3y ago

Some laptop manufacturers include this mode. At least I have it in lenovos (not exatctly 70%, they allow cap at 80%), and have seen in some samsungs years ago.

bornfreddy 3y ago
Where do you set this? OS, BIOS or some Lenovo control software?
- paraselene_ 3y ago
  Lenovo vantage, under battery management or something like that. Has been an option for quite long.
- arp242 3y ago
  On Linux you can set this in /sys/class/power_supply/BAT?/charge_{stop,start}_threshold – you can read and write a percentage (1-100) to there. You'll have to set it on every boot. I assume there's some way to do this in Windows as well, but I don't know it.
- yjftsjthsd-h 3y ago
  At least one of those; depends on the device. As sibling comments note, plenty of devices expose it in software, where in Windows you use the vendor's utility and Linux puts it in /sys, but I've got laptops that either don't do that or I couldn't find it but I could configure it in the BIOS settings. So you might have to dig around a little.

dark-star 3y ago

Dell laptops have had such a feature literally for a decade now

dns_snek 3y ago
That's good to know, I guess I'm curious why it's not (nearly) ubiquitous. Does it add significant cost and complexity to hardware design?
tooltalk 3y ago
Yep. I'm using Linux on a XPS 13 and Dell provides Dell Command Configure, aka, cctk. I set mine to 65%. https://www.dell.com/support/kbdoc/en-us/000178000/dell-command-configure https://www.dell.com/support/kbdoc/en-us/000178000/dell-comm...

suprjami 3y ago

ThinkPad has this. My battery only charges to 75% and it must drop to 50% before it starts charging again. You can configure any value for either setting with TLP.

smartbit 3y ago
On my thinkpad the screen dims after 30seconds without keyboard activity when not fully charged. Very annoying. It happens also when connected to a charger. I regretfully set the bios to fully charge again to disable this auto-dim feature.
- crtasm 3y ago
  Is the screen dimming not a setting in your OS?