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Battery voltage drop over time

CdnHO

CdnHO

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South Ontario and South Texas
My truck is just over three year old. It sits a lot during the summer since we have another vehicle available. During winter the truck is used several times a week. The attached is data from a voltage monitor that I have installed. There is a gradual but noticeable drop in voltage over six days the truck had not been used. The battery was charged through my NOCO on board charger the day before as I don’t like to see the batteries drop too low. The negative spikes are occasions when I have opened the truck door. Not sure at what point the truck refuses to start but found it interesting to see the gradual drop. Left long enough the ECU would not allow the truck to crank. Of course older batteries or batteries in poor condition would experience a more rapid decline.



IMG_3044.png
 
With newer vehicles drawing up to 85MA in a sleep state this is no surprise, i wish they could design it better but with all the tech in these trucks they cant, my truck rarely sits more than a day and the OEM batteries from 2019 are still testing strong with a load testing and the only charge they receive is from the alternator that load monitor is pretty neat i may pick one up for my 12V test bench setup i have
 
oppizzippo said:
Thanks for the link! I was wondering what you used. Do you have to have the app connected the whole time to make the graphs, or does it store the data?
Click to expand...
The device stored the data and the app syncs when you start the app and are within about 20 feet of the truck. I just leave the app open on my phone.
 
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