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.

If setting up TLS is too much work, better stay with a service. Signal is nice.