Possible to reduce max charging current as well? #6

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opened 2025-12-30 01:31:55 +01:00 by adam · 2 comments

adam commented 2025-12-30 01:31:55 +01:00

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Originally created by @dgazzoni on GitHub (May 27, 2020).

I'm curious where you found the BCLM SMC key to limit battery charge level; maybe there are other SMC keys that allow e.g. limiting the charging current? Fast charging is also somewhat damaging to the battery.

Originally created by @dgazzoni on GitHub (May 27, 2020). I'm curious where you found the BCLM SMC key to limit battery charge level; maybe there are other SMC keys that allow e.g. limiting the charging current? Fast charging is also somewhat damaging to the battery.

adam closed this issue 2025-12-30 01:31:55 +01:00

adam commented 2025-12-30 01:31:56 +01:00

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@diogoterremoto commented on GitHub (Jun 3, 2020):

Awesome idea. This way the battery wouldn't heat too much while charging.

@diogoterremoto commented on GitHub (Jun 3, 2020): Awesome idea. This way the battery wouldn't heat too much while charging.

adam commented 2025-12-30 01:31:56 +01:00

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@davidwernhart commented on GitHub (Jun 4, 2020):

Hi @swineone !
I simply found the key by dumping all the keys that MacOS uses to interact with the SMC (which was about 400 in my case) and writing values to keys that looked promising. To put it shortly, it was pure luck. It could definitely be possible that a key to limit charging current exists, but searching for it requires a lot of luck and can potentially harm your system.

I agree that fast charging is also not the best for notebook batteries. I circumvent this problem by just using a lower-wattage USB-C charger than the one that came with my MacBook. I know that this is not a particularly elegant solution, but it's the best I know so far.

Hope that helped!
Best regards,
David

@davidwernhart commented on GitHub (Jun 4, 2020): Hi @swineone ! I simply found the key by dumping all the keys that MacOS uses to interact with the SMC (which was about 400 in my case) and writing values to keys that looked promising. To put it shortly, it was pure luck. It could definitely be possible that a key to limit charging current exists, but searching for it requires a lot of luck and can potentially harm your system. I agree that fast charging is also not the best for notebook batteries. I circumvent this problem by just using a lower-wattage USB-C charger than the one that came with my MacBook. I know that this is not a particularly elegant solution, but it's the best I know so far. Hope that helped! Best regards, David

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Reference: starred/AlDente-Battery_Care_and_Monitoring#6