Can I charge PS5 controller on PS4?
"The DualSense wireless controller is not compatible with the PS4 console," Sony explains via is official FAQ page. If you do plug in a PlayStation 5 controller to the USB port on your PlayStation 4 console, you'll notice that it will start charging. It just won't do anything else.
Can you charge PS4 controller with PS5 cable?
Use the charging cable that came with your PS4 controller (it's a micro-USB connection, which is easy enough to find at any electronics retailer like Best Buy or Amazon). The charging cables that come with PS5 controllers are different cables (they are USB-C cables and won't fit the USB ports on the PS4 controllers).
What is the difference between PS4 and PS5 controller cable?
Dualsense controllers use USB-C, while DS4s (PS4 controllers) use Micro USB. A big upgrade with the change, though it does mean that this is not a backwards compatible cable, sorry.
Can I use any charger for PS5 controller?
Happily yes you can - providing you have a USB-C wire and it delivers at least five volts of power.