This article explains how to use a PS5 DualSense controller on PS4. Bluetooth Adapters, PS4, and DualSense The PS5 controller doesn't just work with the PS4, so you must pick up a Bluetooth adapter.

Take these quick steps to sync, re-sync, or reset a PS5 or PS4 controller to your console.

The good news is that as long as you’re playing the PS4 version of a game, you can still use your old controller. All you need to do is connect it to your PS5 to start playing, and this guide ...

Luckily, there are only a few potential reasons why your PS4/PS5 controller isn't charging, and each issue comes with its own specific solution.