install SystemDataScope. %-s are batt energy in W*h, not capacity in mA*h. I see for last 8 hours avr.discharge current 0.1mA in Standby(both sims=on, BT=WiFi=off, update_time_for_all=manual), deltaV=4.15V-4.071V, -0.58 W*h and -7%. maybe 7% are weird to see, but 0.1 mA it's very good, imho.
Sometimes this happens to me as well with Jolla C, and it seems that Android support is the reason for that. A process called 'system_serve' starts to use a lot of memory (more than 10%) and therefore it drains battery. Switching Android-support off and on (or reboot) once a week or so seems to help.