Most phones will let you control the rate of charge. So you can use a fast charger but still charge at regular old USB speed. Which is 1A @ 5V I think.

Hmm. I have never seen such a feature. You mean most modern phones, do you? I wouldn't buy a phone which is not in this[1] list and most of them are old. My actual phone is about 8 years old (and each year makes me more proud :-)) and I still am totally satisfied (except with its GPS function - it's rather slow to find the satellites, but I don't need it often).

Nevertheless, this is interesting to know. I actually wondered how are people supposed to avoid killing their batteries as slow chargers are disappearing from shops. Which seems a serious problem today as most of the modern phones don't even let you change the battery without going to an authorized service shop.

[1] https://wiki.lineageos.org/devices/

I have seen the option in all recent (3-4 years) Samsung phones. I have it on mine (S10) which is in the LineageOS list. You can separately throttle the wired and wireless charging speed. I don't know if the feature would be exposed inside LineageOS.

> My actual phone is about 8 years old

Amazing. I wish I had the self control to not keep buying the latest phone every couple years.

PS: I have even setup mine to switch to slow charging only if it is past 10pm and I am at home. Any other time or place, it charges at full speed. Because that is handy sometimes.