Fun fact testing!
Same device, same 24 hours. No other apps open.
Test 1: nostr:npub1xnf02f60r9v0e5kty33a404dm79zr7z2eepyrk5gsq3m7pwvsz2sazlpr5 in persistent mode
App working in background and making some payments.
Battery used 30%

Test 2: nostr:npub1whtn0s68y3cs98zysa4nxrfzss5g5snhndv35tk5m2sudsr7ltms48r3ec and Amber
App working in background and making some chats
Battery used 80%