PopeRigby
There is a lot of factors here. Assuming you have nothing running in the background throughout the whole day, if your batteey is going from 100 to 20% in 1 day then you definitely have a bad battery, which is totally possible with refurbished phones. See refurbished work can be very dodgy and they often use old parts inside that may have high milage.
I have a 6a, owned for 9 months from brand new. I am a VERY light user. I only charge it when its around 20-30% and up to 75-80%. My phone lasts around 4 days i think before its back to 30% and i have to recharge it.
For reference and for your testing, this is how i operate my phone:
- no Play components installed or running in background
- wifi is on only when I'm using the internet for browsing and forum posting which is about 1 to 1.5 hour a day.
- vpn app is active only when wifi is on. Otherwise i manually terminate (force stop) the app. (If force stop is not done then battery drain is doubled)
- i have signal and element messaging apps which are essentially always in "forced stop" mode (not running in background) except when i want to use them.
- Bluetooth is always off.
- for sleep time i put the phone in airplane mode
- i generally have no more than 30 minutes of phone conversation on this phone.
So essentially this phone is sitting at total idle for the 15 hours a day and 9 hours in airplane mode, and the result is a 50% battery loss in 4 days.
If i were to let the vpn and rhe messaging apps run in the background and have wifi and Bluetooth on i think i might lose 50% in 15 hours.
I can also say, if you have absolutely nothing running on your phone and not even use it but have a sim in and having the radio on, you should lose about 10% to 12% per day, depending on how strong the radio signal is in your home.
Hopefully this can be used by you to test your battery.
Also, my pixel easily lasted about 20 days on a single charge when i had just bought it and it was always in airplane mode and i wasn't using it at all. Something like 5% loss per 24 hours.