General > General Technical Chat
Extending lithium battery lifespan
<< < (3/4) > >>
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.
Navigation
Message Index
Next page
Previous page
There was an error while thanking
Thanking...

Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod