BIOS setting doesn't work

[Louis125]

Although I set the BIOS option "maximize battery health" the loading doesn't stop at 80% but continues to 100%.

What can I do?

[BeemerBiker]

There is a discussion about the problem here, but no resolution.

You might try a battery calibration since you made a change in the BIOS.

https://support.hp.com/us-en/document/ish_2268927-1713329-16

[TzortzisG]

Hello Louis125.

I'm pretty sure you don't have to do anything at all, and that the BIOS option is being correctly applied.

Let me explain what I mean: Early BIOS versions on your system had the battery stop charging at 80% with this setting, and you would see the level stop rising at 80% if you clicked on the battery icon. However, on September 2021 HP made a change to the way the BIOS handles charging, and issued an appropriate BIOS update. You can read about this change here: HP Battery Health Manager setting change . The BIOS update for your system that implemented this change was the sp134279 (info) . After updating to this version (or higher), and according to the HP document I linked to before, when setting the maximize battery option the firmware reduces the maximum allowed capacity of the battery to 80%, and this new lower capacity is charged at 100% (of the 80% allowed). The operating system (Windows) doesn't see what's actually happening and shows a fully charged battery.

The only way for someone to make sure that the battery is charged at 80% (other than looking at the BIOS option) is by running a monitoring program or app that can read the battery's wear level. Since the firmware sets the new battery capacity as 20% lower than its designed capacity, the wear level will be 20% higher than before, and the battery's health will be 20% lower (a new battery will read 20% wear and 80% health). You can run this simple Nirsoft portable program and read the Battery Health info.