Spoiler: 5-watt charging is really, really slow

If you’ve bought an iPhone 12 or iPhone 12 Pro already, or are perhaps considering picking one up down the line, you’ll likely want to invest in a better charging solution than that old 5-watt adapter you might have lying around from Apple-branded handsets of the past.

We’ve tested the iPhone 12’s charging speed on that iconic brick, as well as Apple’s new 20W USB-C and MagSafe chargers, and the results are eye opening.
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https://www.tomsguide.com/news/iphone-12-charging-speed-tested-20w-vs-magsafe-vs-5w