| General > General Technical Chat |
| 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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