I've been using it successfully for around a year. It works pretty well sans a couple quirks due to hardware limitations e.g. if you plug in with the screen closed (sleep mode) it will charge fully to 100%.
For my main computer (M1 Macbook Pro) that spends roughly 80% of the time on its charger, I have it set to 65% which gives me plenty of margin at home, plus it allows you to top-up to 100% on the pro version with one click.
For my 2015 Macbook Pro with heavily degraded battery that spends 100% of the time on its charger and on, I set it to 50% to (hopefully) lengthen the life of the battery before it swells since removing the battery safely is a bit sketchy on even that era of Macbook.
1. OS’s battery driver does the charging. This is possible when the computer is on and the driver has control. 2. Firmware driven charging. Typically used in sleep mode 3. Analog Trickle charge - no intelligence, no code is executing. Charge slowly from a dead battery so as to not damage any components.
#1 is the only case where an app. Can control any aspect of charging.
I eventually tried this instead (for Intel Macs) :
https://github.com/DevNulPavel/osx_battery_charge_limit
I use it to keep my battery level indicator pegged at 70%. Often doesn't persist after a system update, but it's just a quick terminal command to reapply the setting.
I use my Macbook in clamshell mode, and I use sleep mode when I'm not using it - receiving power from a Thunderbolt dock. It's handy to pick up exactly where I left off on resume. Plus, I use two LG screens where one of the two doesn't switch on after a cold boot, and it's annoying to unplug and replug to activate it. Sleep mode gets around that.
It’s an M1 Pro MacBook that I’ve had since launch.
I keep it at ~80% limit normally with occasional charges to 100% for long trips, etc. I do spend a lot of time on battery though so it's charging and draining a lot, but rarely goes above 80% charge.
Thanks for posting your results, I'm curious just how much the charge limit helps battery longevity.