Yes it eats a lot of battery. On mac you can use f.e. or just a safari with alby extension and or other nostr web client like coracle, primal.
You can use Swiss Bitcoin Pay app just on a phone. If you are in Europe it can convert and send euros to your bank.…
Zeus just announced their open beta with embedded node on your phone. Should work on most android/ios phones.…
You can just buy heater editions of asics (with silent fans), plug them in, earn sats and heat your room :) f.e…
Depends on your skillset. If you know how to install things yourself I would buy an older laptop, fe Thinkpad and upgrade it with a large ssd. I like a