Well, you need to.
If it doesn't start, you can't bring it to Autozone or Advance Auto and ask them to do it...even if they're still doing that during the pandemic.
For an LD Charger, the best diagnostic tool is an ELM327-compatible Bluetooth OBD adapter and AlfaOBD for Android.
If you're looking for a less expensive solution with a very short learning curve, you can pick up a simple OBD code reader from Wallyworld, that auction website, or that other big website named after a river in South America for less than $20.
Might want to take the battery to a parts store and get it load tested, and go to
this website to find out whether your car has an outstanding alternator recall.