You’re mixing up two units.
Let’s say your battery has a capacity of 2 Ah (ampere * hours) and your charger outputs 2A (Ampere). This means the charger would need 1 hour to fully charge your battery. Now take a 1A charger, this would take 2 hours to charge the same battery.
Docker Gitea to Docker Forgejo was basically using a different image and pointing it to the existing database. Not sure if and when both will be different enough for that to no longer work. But I also only use it as a docker compose storage repository. No idea about automation etc.