General > General Technical Chat
Half charging lithium ion batteries for longer life expectancy
tooki:
--- Quote from: jonovid on May 26, 2022, 07:44:57 am ---how would you do this? in a charger design. add a timer? if you know the full charge time.
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FYI, this is not how you would go about it. Lithium cells are far too fickle to charge properly with just a simple timer cut-off, so you need much more advanced charge termination detection and state of charge detection. Devices that do it properly, which includes every phone, tablet, laptop, car, etc., accomplish this with dedicated ICs for both charging and state of charge monitoring. The latter are commonly called “fuel gauge” ICs, and they do it by actually counting coulombs flowing in and out of the battery, and adapt constantly to account for cell wear. (And they must be configured by the device manufacturer to calibrate them for the load.) So you would use the state of charge data from the fuel gauge IC to decide when to stop charging early.
Siwastaja:
--- Quote from: ConKbot on May 29, 2022, 05:20:13 pm ---Even "high quality" cells meant for hobbyist drone/RC applications have an appallingly bad service life.
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Oh, but that whole market is lowest tier crap.
Just flashy marketing.
tom66:
A key property for Li-ion battery lifespan is high coulombic efficiency.
You will find many phone batteries, RC car batteries etc. get quite warm under charge, indicating relatively high loss. But, even if you cooled the cell down so that it is still at room temperature, it will deteriorate. It is not the heat that is damaging the cell, but the cause of the heat.
David Hess:
--- Quote from: tom66 on May 26, 2022, 09:30:01 am ---My impression is that Li-Ion battery life is just naturally improving anyway.
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My experience is that while base battery life may be improving, consumer grade equipment charges the cells to a higher maximum capacity limiting cell life to not much more than a year.
james_s:
Seems I read that for most Li-ion chemistries charging to 80% is optimal for long life. Temperature also plays into this, the absolute worst case for them is fully charged to 100% and elevated temperature.
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