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this post was submitted on 24 Nov 2024
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Slow charging is actually better for battery longevity than fast charging. For example, my phone will limit it's charging speed at night when I have an alarm set, because it assumes I won't need it until my alarm goes off, and the slower it charges the less damage is done to a battery.
In general, lithium batteries are damaged by heat. Rapid charging creates extra heat, so it's worse for the battery. Manufacturers work hard to minimize the damage of quick charging, but it's still somewhat better to slow charge when you have the time.
When you say "slow charging", are you talking about actual slow charging or normal charging? As I stated in my other comment, I've only ever heard that about normal charging and never about slow charging.
The slower the better for battery health.
Usually slow charging is just the standard USB 2.0 output, which is 5v 0.5A (so 2.5 watts). That was all the USB standard officially supported for a long time, but many devices and chargers actually supported up to 5v 1A (5 watt) or 5v 2A (10 watt) charging. Those would usually be considered normal charging.
Fast charging has a couple different specs and voltages, but can go up much higher. My steam deck supports 45w charging, and some laptops support 65w or higher.