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For old macbook users (with magsafe connectors), covering the middle pin in connector stops charging the battery while running the laptop on main power supply.

Details: https://apple.stackexchange.com/a/132332/87309

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That's excellent - thank you! I use my macbook at my desk quite a lot, and so usually it's plugged in and sat at 100% charge for hours (days?) at a time. So the ability to hold it at around a 40%-70% SOC is really useful

Sorry, why would I want that? Didn't they have smart overcharge protection yet?

Yes, they have over-charge protection. But apple laptops still go all the way to 100% whenever you plug in.

It is not a good idea to charge a lithium battery to 100% all the time. The source article also specifically mentions it, giving reference to Battery University.

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