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Comment on The Sodium-Ion Battery Revolution Has Started

A typical phone battery is rated for about 500 (you can massively improve this by not charging it beyond 80%).

This 80% thing is incredibly simplified and not even always accurate. Personally I charge to about 95% and my phone batteries remain at 98-100% condition after 2 years of everyday use.

Limiting yourself to 80% doesn’t really make sense. You’re losing 20% capacity instantly, instead of losing it slowly over a few years. To be fair, a lot of people treat their devices so poorly that they may hit the 80% in less than 12 months, so I guess there’s that.

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spongebue@lemmy.world ⁨2⁩ ⁨days⁩ ago
I keep my car charged to 80% to help with battery degradation, and here’s why:

Most days, I don’t use more than 30% of my battery capacity (roughly 75 miles/120km). Even that’s high. I don’t care if that means I go from 100%->70% or 80%-50% when I’ll charge back up again overnight

It’s not a permanent setting! If I do go on a longer trip, I’ll bring it back up to 100% and not sweat it!

From what I’ve heard, charging beyond 80% increases the degradation rate, meaning time spent at that level is an important part of the equation. If I keep my phone plugged in overnight and at my desk, I have a lot of time at full charge that I’m not really using, but if I know I’m flying that day or running errands all day I can pop it up to 100% and it will be a non-degraded 100%

I’ve had my S20 far longer than my car and never did limit its charge. It’s fine for me, but the battery is sure showing its age.
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- AA5B@lemmy.world ⁨1⁩ ⁨day⁩ ago
  I don’t see this as a valid comparison.
  
  replacement phone batteries are really not that expensive. Don’t overthink it. Is it really a problem you might spend $50-$100 in three years to replace the battery?
  
  car batteries are not just much more expensive but they’re also overkill. Charging to 80% is more than enough for almost everyone’s daily driving on most vehicles, so why charge more?
  
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  - spongebue@lemmy.world ⁨1⁩ ⁨day⁩ ago
    Maybe user replaceable phone batteries are making a comeback, but with the way my phone is pretty much sealed up I wouldn’t trust myself to not break it. I’d also be leery of a third-party replacement lithium battery of unknown quality (let’s be honest, that’s what you’ll probably end up with) charging right next to my head while I sleep. Saying that as someone whose friend had a lithium battery fire with her laptop.
    
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    AA5B@lemmy.world ⁨1⁩ ⁨day⁩ ago
    
    the argument of “why would you try to save your battery by not using it when it has the same net effect of less battery?” is pretty short-sighted.
    
    The argument is
    
    why try to save your phone battery when it’s critical to last the day and eventual replacement is cheap?
    
    it’s much more important to save your car battery because you won’t miss it on normal days, you want max range available for road trips, and replacing the battery is very expensive
    
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khannie@lemmy.world ⁨2⁩ ⁨days⁩ ago
Yeah, a friend of mine made a similar argument and I hear it. Personally I’m always right beside a fast charger so it’s not an issue for me.

My phone has an option to auto-stop charging at 80% so I use that. I will occasionally charge it to 100% but like maybe once a month. TBH if it had an option to stop at 90% I’d probably use that as a middle ground (my steam deck does and I use 90% with it). I got 5 years out of my last phone and I’m 3 years into the current one and hoping to get many more out of it.

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- Mnem667@sh.itjust.works ⁨2⁩ ⁨days⁩ ago
  I think that fast charging is almost as damaging as full cycles.
  
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  - khannie@lemmy.world ⁨2⁩ ⁨days⁩ ago
    OnePlus claim it’s not and a quick search does back that up. For the one specific to my phone they move a chunk of the work off the device (reducing heat on the phone) and onto the charger. It’ll still charge normally with any USB charger but it gets much hotter and is much slower compared to the OnePlus “warp” charge.
    
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    Mnem667@sh.itjust.works ⁨2⁩ ⁨days⁩ ago
    Fair enough. I’m using an OP12 myself. I still don’t buy into the “fast charge ok” bit, but I also know it’s parallel cells and such. I still charge overnight using a 5w charger. :)
    
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