Lithium battery life study

[DaveAndBecky_NorthernMI]

An interesting study about lithium battery life and storage.

https://diysolarforum.com/resources/calendar-aging-and-lifetimes-of-lifepo4-batteries-and-considerations-for-repurposing.263/

[Guest]

Interesting indeed! Thanks for the link!

[CnC]

There's a reason battery companies don't warranty them forever...

Additionally, not all devices on the same system necessarily "see" SOCs values the same. 

Charlie.

[Mike and Carol]

Interesting and educational article.  Thanks for posting.  Mike

[John E Davies]

Has anyone read the actual thesis? The abstract shown doesn’t say anything new or exciting, it is common knowledge. I would be very interested to see charts showing the rate of degradation compared to temperature and SOC. If 100 degrees and 100% SOC is bad, how much worse is 120 degrees? 140? It can get toasty hot inside that box, as delivered.

I do try to park with my battery box facing north and/ or pick a site that is shaded after noon when the temperatures are expected to be extreme. And I keep the batteries well below 100%. If I lived and routinely camped in the arid SW desert states I would probably pass on lithium batteries entirely.

EDIT, never mind, you can download the entire thesis on the History tab, it is 197 pages so it may take a while to digest the information. I will try to read it when I have a lot more time. I am off to grease jack actuator gears….

https://diysolarforum.com/resources/calendar-aging-and-lifetimes-of-lifepo4-batteries-and-considerations-for-repurposing.263/version/463/download

John Davies

Spokane WA

[John E Davies]

Here is the next paragraph of the abstract.

“Utilizing the collected degradation data from the calendar aging experiments and manufacturer’s cycling data a lifetime degradation model was produced to simulate the extent of aging from different geographic locations and to compare which degradation mode had the most influence over a ten year lifespan. The model was validated using additional data not included in the non- linear degradation model and the results tabulated using real-world temperature and drive cycle data. According to the simulations, calendar aging plays a significant role in the loss of capacity within the battery pack, due to the battery pack not being utilized on a constant basis in the vehicle. Incorporating it into the simulation resulted in the battery pack reaching its EOL much sooner than the targeted consumer requirement of ten years.”

😳😤 My bold highlight…. that is not good for an RV application that is not a full timer. FYI the batteries studied were for electric vehicles, not trailers, so the conclusions may not be 100% accurate for Ollies..

John Davies

Spokane WA