/tech/ - Technology★

if you read through the thread on xda, some people have had some success controlling

/sys/class/power_supply/battery/voltage_max

if you change this to writeable, and overwrite the voltage there, android will stop charging at the voltage (and I assume it will show 100%), and this type of voltage controlling can be done without using percentages or an app to control a toggle, the voltage can be set at boot and it's done.

i have not had success here, overwriting votage_max is not nearly as widely supported.

Just put it on my S4, will report back if I notice anything different about it. I've had it for a while and the battery has been really shit lately, so maybe this does something to alleviate that.

>>1006710

this is supposed to extend the time it takes for your battery to go to shit, if it's already gone i don't think this is going to help much beyond slowing the rate it's already degrading.

Ancient news, just like printer technology. If you don't own the device, they'll do everything in their power to obsolete your hardware just past warranty.

This information is also relevant to capacitors in all your devices, so check your motherboards, monitors, controllers, keyboards, etc.. I've even seen Asus ship out expired capacitors on on "Brand new skylake" mobos.

PSUs manufacturers also are greedy in this.

This is of course old news but most people don’t know about it. I have my two batteries in my Thinkpad with tlp set to charge when they drop to 40% and stop when they hit 60%. They’ll be good for decades with such light wear.

I never discharge down to empty either, you can expect to lose about 1% of your battery’s initial capacity every time you do. Pretend 20%=0%.

>i'm surprised android devices have this capability at all, it supposedly has wide support, though it isn't implemented at all officially in android.

Most likely it's part of the kernel (Linux, of course) and disabled by default. Other stuff that is supported by every Android phone thanks to the kernel, but disabled by manufacturers are loading and unloading kernel modules (instead of loading every driver at boot. This could be used to shut off wlan or bluetooth), FM Radio support, ext4 support, most of the kernel's hardware support, etcetera.

>>1007390

i think this is actually a proprietary driver though, a kernel module that the manufacturer includes in the kernel specifically.

i just wonder why they would build this functionality into the kernel module/driver for the battery/charging circuitry, and then not use it in any device i've seen, atleast not in the android UI. this should be something configurable in the android settings. it's obvious why they don't include it in the settings, the manufacturers don't want you replacing batteries, they want you replacing phones, but there must be some phone or some device running android that takes advantage of this type of functionality, somewhere.

it's not even the same generic control file to flip this toggle, there's a bunch depending on the manufacturer/chipset, and they all do the same thing. it's not just a fluke with one manufacturer doing it, they almost all do.

maybe it's some kind of overcharge protection? if it detects more than 5V on the usb pin it cut's it off, or if it detects a short or something to protect the phone?