what's the normal battery voltage drop after one week? intermittent parasitic draw

After removed GPS tracker from my new truck(stock without any aftermarket addon and battery is original OEM Panasonic battery 3 months old) one week ago, I drove it on highway for 30min to make sure battery is fully charged, I measured voltage is 12.83v after two hours let car site idle/ignition off then.

After one week, I measured voltage is 12.52v. (reading right after I open door to open hood not Open Circuit Unload Resting Voltage not sure if this measuring method is correct or not?)
is it normal?
BTW: the voltage is measured right after I open the door to open the hood
the lowest value is 12.52v it will jump up to 12.58v after 10min
will keep monitoring voltage drop next week

What's the voltage drop range can be considered as normal after one week?
Want to know what's the minimal voltage to start engine?
Saw 12.2v can start engine on forum but 12.2v is only 60% State of Charge?


Then I did parasitic draw today

door open - 600ma
several mins later - 100ma -> 30~40ma
20min later -> 12 ~20ma

but
at around 16:10 I saw parasitic draw jumps to 100ma for several mins -> 70ma for about 1 hours -> 30~40ma -> ~15ma
I once thought the abnormal behavior is caused by gps tracker but it still exists after I remove gps tracker from OBDII port
It's a 2023 limited with OEM remote start and keyless entry
Is it possible the above features cause the abnormal behavior?

the same abnormal behavior had been captured three weeks ago

before I did parasitic draw test I did disconnect battery to connect amp meter not sure if the above abnormal behavior is caused by that?
Thanks for all hints and input on my issue

 

I just bought a clamp on style amp meter to measure my parasitic draw. But have not tested yet. I think <50mA is considered normal. I don’t think 1 week is normal to be at that voltage.

 

ElectroBoy has posted good reference
in https://www.4runners.com/threads/ma...ck-wont-start-at-all.21042/page-3#post-481248

draw drops to ~12ma after 20min

 

Thanks
I need to know what's the normal voltage drop range as reference

 

my understanding is that 5th gens have to be driven every few days or have to be on a battery tender. Parasitic draw is a known quantity in a rig with zero issues.

Not saying you don’t have an issue but i know for sure that i and others don’t and we still have a small draw. Others can correct me if I’m wrong - just my takeaway from a longer discussion thread. I forget exactly what’s normal, tho…

 

yup, there it is. that’s the number i know of, too.

 

Mine sits in my garage for 3-4 weeks at a time and doesn't seem to have any issues at all with starting or depressed battery voltage. The DCM fuse has been pulled for almost 2 years, but otherwise everything else is the way it came from the factory electronics-wise.

 

There is more to it than how many volts does it take to start your vehicle. A good battery at 12.2 volts can easily start the vehicle, however, a bad battery at 12.2 volts will not start the vehicle. The bad battery may read 12.2 volts but cannot supply the needed current to turn the starter. Voltage under load would be a valid measure as to whether the battery would start the vehicle and in fact is the basis of a battery tester.

 

Agree with your point on voltage under load is more meaningful
but it's hard to control exactly load for battery in car
so I just compare the voltage under similar situation for example right after I open door to open hood
the absolute value may not be meaningful but I can figure out the relative delta of voltage for different dates
Thanks for your input

 

You could connect a battery monitor to see everything going in and out of the battery over time to better understand your situation.

Victron Energy | SmartShunt 500A/50mV - Signature Solar

I have one connected to my auxiliary battery and it seems very accurate and reads down to 0.01 amps.