Is it normal for Boot Voltage to go down?

[siri_3005]

So I've owned a iPhone Xr for almost a year now and it's been a really good phone. For the last week or so, I've been checking my phone's current health on 3UTools and realized the Boot Voltage has went down from 4.20 to 4.17. Is this normal cause I don't know much about how voltage works lol

 

[Lekro]

Boot voltage is the minimum amount of voltage required for the motherboard to turn on, then the motherboard can draw current as needed (iPhone boot sequence fluctuates from 0.2A to 1A at 4.2V during boot. Voltage is 4.2V by standard. I'm not sure why it went down by 0.03V for you but I'm sure it is nothing to be concerned about. It can be that 3uTools reads it wrong.