I think he means completely empty: with every cordless screwdriver, laptop, every tool, e car, e bike there is a limit where the system switches off or shows “empty” as the manufacturer has set it. this is also the case with every eppg.
I think making the list is a very good idea. I’ve measured about 25 wings myself over the past few years. but with other eppg.
One suggestion is to upload the flights to xcontest because you can then see the user behavior such as average speed, gain in altitude, etc. as well as the weather situation as there is a big difference between flying in the afternoon or in the evening as an example. to log the flights a mobile phone is enough if you don’t have a vario with igc.