this is what sudo tlp-stat -b prints:

— TLP 1.6.1 --------------------------------------------

+++ Battery Care

Plugin: generic

Supported features: none available

+++ Battery Status: BAT0

/sys/class/power_supply/BAT0/manufacturer = DP

/sys/class/power_supply/BAT0/model_name = bq20z451

/sys/class/power_supply/BAT0/cycle_count = 666

/sys/class/power_supply/BAT0/charge_full_design = 6330 [mAh]

/sys/class/power_supply/BAT0/charge_full = 5043 [mAh]

/sys/class/power_supply/BAT0/charge_now = 4936 [mAh]

/sys/class/power_supply/BAT0/current_now = 0 [mA]

/sys/class/power_supply/BAT0/status = Full

/sys/class/power_supply/BAT0/charge_control_start_threshold = (not available)

/sys/class/power_supply/BAT0/charge_control_end_threshold = (not available)

Charge = 97.9 [%]

Capacity = 79.7 [%]

do you still recommend a new battery?

When MacBooks are plugged in, they get their power from the charger. They are not simultaneously draining and charging the battery in general.

so when the battery is fully loaded a controller tells the mobo to stop loading the battery and to use power from the charger to simply power the notebook, is this so?

The most important part with batteries is to check if they start swelling up.

do you mean physically swell up? like I’m going to see it bent/bigger?

If you’re gonna use Linux then go ahead and replace the battery so that you’re not worrying about it failing miserably to communicate with the charge controller or battery itself and tell you when telhe thing is fucked and need replacing.

I’m already using linux, macos was nuked.

I don’t understand this paragraph. Do you mean new batteries for this model (macbook pro from 2014) work better with linux?

just to be clear, you mean removing the battery, or do you mean using a command?

in recovery mode as root I executed:

mount -o remount,rw /

mount --all

then cd’ed to /media/home, ls’ed and got no results.

I also don’t know if changes to make the system writable are made on the go or if I have to reboot. I rebooted and the system is still in read only mode.