r/science • u/mvea Professor | Medicine • Jan 03 '20

Chemistry Scientists developed a new lithium-sulphur battery with a capacity five times higher than that of lithium-ion batteries, which maintains an efficiency of 99% for more than 200 cycles, and may keep a smartphone charged for five days. It could lead to cheaper electric cars and grid energy storage.

https://www.newscientist.com/article/2228681-a-new-battery-could-keep-your-phone-charged-for-five-days/
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u/[deleted] Jan 04 '20

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u/peteroh9 Jan 04 '20

But who should I believe? Someone with no sources or someone whose source is basically "I heard that...?"

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u/HenkPoley Jan 04 '20

AccuBattery for Android cites some sources.

https://accubattery.zendesk.com/hc/en-us/articles/210224725-Charging-research-and-methodology

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u/peteroh9 Jan 04 '20

So does that mean it's best for batteries to have the lowest possible charge?

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u/HenkPoley Jan 04 '20

Apparently satellite batteries are kept between 40% and 60%. So I'd say halfway charged is best.

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u/sheldonopolis Jan 04 '20

It isn't as bad as fully charging and then storing at 100% for a while but it is def outside of the comfort zone of li-ions and will have some kind of impact in the long run. Having tesla charging/discharging its batteries near the optimum seems certainly not like a bad idea.

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u/TheBlack_Swordsman Jan 04 '20

I believe Elon said if you have to charge to 100%, don't leave it for long. Try to time it to ride right when it hits 100%.

But I don't think it's something he recommends doing on a regular basis.

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u/HenkPoley Jan 04 '20

Yes, the effect is small. You just shouldn't charge to 100% all the time.