Can I use 20w charger to iphone 13

Apple’s 20W power adaptor is the ideal device to charge ANY iPhone or iPad.

The actual charger is built-in to the iPhone or iPad so it will ALWAYS protect itself and only draw as much power from the adaptor as it needs.

The best advice to prolong your battery’s life is to simply enable “Optimized Charging” and leave your phone charging all night.

This simple routine also allows automatic iCloud backups to reliably occur - assuming that WiFi is available AND that your phone is “locked.”

Sure.

But not really enough to worry about regarding battery health. There are tiny things at the margins that **might** reduce a little bit of battery wear, but it's generally not worth the effort. Just turn on Battery Optimization. All the things that could do the most to reduce battery health really need to be automated, and Apple doesn't provide any means for the user to control that. Apple also recommends against charging in a case in order to reduce heat.

Yes. Use it.