Charging lithium ion batteries - fact vs common knowledge

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#2982029 12-Oct-2022 17:11

frankv:

If you have a Wifi-enabled plug, you could have an app monitor the battery state and send a message to the plug to turn it off. Or similarly via BT. Maybe something similar via OTG, except I think OTG doesn't allow power supply IIRC. Or use a specific tone for the alert, and detect that in an external device that turns off the charger.

But these are all work-arounds for a deficiency in the OS. And of course phone manufacturers have no motivation to decrease the rate at which cellphones wear out.

Not a bad idea. Also quite easy to do with Home Assistant and plugs, since HA can monitor phone state of charge.

timmmay

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#2982030 12-Oct-2022 17:12

MikeAqua:

DonH:

Some Lenovo laptops have a power management option to limit charge to about 56% to maximise battery lifespan when the laptop is normally used on mains power. This level of charge apparently minimises internal stresses in the cells. It's also why new batteries are supplied approximately 50% charged.

hp has something analagous on the probook

They changed it in the BIOS in the last year. You can still optimise for battery runtime or battery longevity, but previously it stopped at 80% charge, now it stops at 100%. It might be that they charge to a lower level but call that 100%.

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#2982036 12-Oct-2022 17:26

Those are very old articles. They may still be correct but it would be nice to have something more up to date.

I know lithium battery tech has changed for some uses like electric cars & high end RC model batteries, but I'm not sure on phones & laptops.

timmmay

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#2982072 12-Oct-2022 18:57

My impression is the articles were written years ago but updated.

Oblivian

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#2982085 12-Oct-2022 19:25

Hp enforced 80% capacity to stop swelling.

Dell did also during same timeframe. Still stand fast it's not an issue. But implementation...

document

Maximize My Battery Health: This setting limits the maximum state-of-charge on the notebook battery to 80%, which
has been proven to optimize battery health and helps mitigate battery swelling due to high state-of-charge.

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#2982121 12-Oct-2022 22:18

MikeAqua:

lapimate:

Some (newer?) Samsung models include this as an optional setting.

Thank you. I found this in all my Smasung devices (Android 12) under: -

Battery and Device Care > Battery > More Battery Settings

It limits charging to 85%.

Thanks for this! I can uninstall Accubattery now and not have to worry about waiting for the phone to notify me in order to turn charging off.

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#2982122 12-Oct-2022 22:27

accubattery says my battery health is 111% of design capacity, which is BS considering i know its lasting about 30-40 mins less than when i got it.

So i would trust it about as far as i can throw it.

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#2982136 13-Oct-2022 03:33

Accubattery will have an estimated capacity based on charging history and a design capacity. Is what it's showing for design capacity consistent with what your phone should have?

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#2982138 13-Oct-2022 05:58

Bung: Accubattery will have an estimated capacity based on charging history and a design capacity. Is what it's showing for design capacity consistent with what your phone should have?

design capacity is correct, the value has been going up and up since ap install.

timmmay

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#2982140 13-Oct-2022 06:47

AccuBattery seems to be generally showing what I would expect. My phone started at about 105% of capacity, it's slowly going down, it's at 94% after a year. If anything I would say that overrates the capacity, as it feels like the phone doesn't last as long. The app is only as accurate as the information the phone hardware gives it, some phones may be better than others.

The new version of AccuBattery only uses charges over 60% of capacity to work out battery capacity. Give that a shot for a week and see how it works.

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#2982153 13-Oct-2022 08:06

i once did a 12 month test

- me - new samsung galaxy s20 ultra. charge to 80% use to 20%. normally last 2 days between this charge cycle, sometimes one day. can count with 2 hands the number of times accidentally charged to 100%, same with draining to 0%.

- wife - new iphone 11 pro max every night plugged in 100% overnight (8/9pm-8am) unless she forgot

after 12 months both were at 88%

i was fuming - since then i didn't care

sometime after that samsung made the charge to 85% feature

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#2982154 13-Oct-2022 08:07

Leaf - slow charge to 80% only for 6 months. i watch the SOH drop every month. FUMING

after that 6 months (armed with the iphone vs samsung knowledge) - plugged in slow charged to 100% at EVERY OPPORTUNITY

i can't care less

johno1234

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#2982156 13-Oct-2022 08:11

Given the cost of these vehicles and devices, is it too much to ask for them to just have smart chargers that do the best thing (unless overridden)? They're consumer devices, not technical devices.

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#2982157 13-Oct-2022 08:20

johno1234:

Given the cost of these vehicles and devices, is it too much to ask for them to just have smart chargers that do the best thing (unless overridden)? They're consumer devices, not technical devices.

why would they want their stuff to last forever? who is going to buy next year's model?

johno1234

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#2982160 13-Oct-2022 08:29

Batman:

johno1234:

Given the cost of these vehicles and devices, is it too much to ask for them to just have smart chargers that do the best thing (unless overridden)? They're consumer devices, not technical devices.

why would they want their stuff to last forever? who is going to buy next year's model?

I've seen reports of Tesla batteries holding up really well. Maybe St Elon has done the right thing?

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