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Extending lithium battery lifespan

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not1xor1:

--- Quote from: Connecteur on July 17, 2021, 03:37:13 pm ---I have very little electronic expertise, but I believe the lifespan of lithium cells can be greatly extended by undercharging.  Conversely, I believe that overcharging shortens their lifespan.  I have replaced 12V batteries with banks of 4 lithium cells in series.  This charges each cell to 3V, well below the nominal full charge of 4.2V.  I expect such a battery of cells will last many years.

--- End quote ---

AFAIK to make Li-ion batteries last as long as possible you should keep them within 40% and 60% of full charge. The corresponding voltage depends on the kind of battery. A slow charge (< 0.5C) also helps a lot as avoids/reduces metallic lithium deposition.

deadlylover:
I use a smart plug and Siri automation to turn on/off a charger automatically (it can trigger on battery percentages). I stop phone charging at 60% and iPad charging at 50%. I'm basically always home so I only charge to full if I'm on travel or if I need to go out for the whole day.

Reported values are from coconut battery:

iPhone XS Max = 597 cycles, 101% health (34 months old, no change from 565 cycles @ 32 months) I won the battery lottery with this phone.  ^-^
iPad Air 2020 = 193 cycles, 98% health (8 months old, no change from 142 cycles @ 5 months)

As another fun data point, my Mum's phone without any battery care (albeit a very light user as shown from the cycle count):

iPhone XS Max = 299 cycles, 95% battery health (33 months old)

My poor old iPad Air 2 without any battery care shows 824 cycles, 60% health, 83 months old. Anywhere below say 20-30% and it will shut down if it does anything stressful so it's a PDF viewer now.

Connecteur:
I have two Samsung tablets, which I believe use the same version of Android as my phone.  Both tablets have the option of charging to 85% to preserve battery life, but the phone has no such option.

Leads me to believe that Samsung wants us to replace our phones every 1-2 years, but keep our tablets for much longer.

james_s:
Seems like I read some military applications charge li-ion batteries to 4.0V to extend their life. My Lenovo laptop has a mode that charges them to 87%, which I've always had enabled unless I need maximum run time. So far so good, I think it was 2015 when I bought it and I still can use it all day on a charge.

Connecteur:

--- Quote from: james_s on October 12, 2021, 05:07:57 pm ---Seems like I read some military applications charge li-ion batteries to 4.0V to extend their life. My Lenovo laptop has a mode that charges them to 87%, which I've always had enabled unless I need maximum run time. So far so good, I think it was 2015 when I bought it and I still can use it all day on a charge.

--- End quote ---
I believe the Prius charges the lithium ion battery to 70% to preserve battery longevity.
2012 models are still going strong.

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