this post was submitted on 04 Mar 2026
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Edit: This was all wrong. I forgot I have a battery saver mode on my phone that lowers "fully charged" to something like 80%, so it is ideal to keep it "fully charged".
~~Never heard the "above 80%" thing. I'm pretty sure you're wrong about this. With lead-acid batteries, this was optimal. I'm pretty confident that lithium ion batteries it's best to keep the charge as high as possible. Ideally you'd only ever use it fully charged. It's health is harmed by draining it low/fully.~~
~~I don't own an EV, but I know enough about it that I'm pretty sure this is the case. You should look it up for your vehicle though. This advice also applies to phones and other lithium ion batteries too. Lead-acid was damaged by keeping the charge high, but lithium ion is damaged when low, and almost all devices are lithium ion now.~~
confidently incorrect.
You could disabuse yourself with a quick search.
Oh, sorry. You're right. I forgot I have my phone on a battery saver mode where "fully charged" is not fully charged.
Lead acid batteries like to be kept fully charged all the time and don't like to be discharged below 50% state of charge.
Lithium batteries like to be kept around half charged. They degrade quicker when kept at a high or low state of charge. Running lithium batteries from 20-80% does extend the lifespan, but charging to 100% is fine when you need to go on a longer trip. Just don't keep it at 100% for long periods of time.
I think the BYD blade batteries can go down to 20% and up to 100% weekly. Though tbh I probably keep mine too high, I should lower it a bit closer to 80%...
Lithium ion batteries have a sweet spot of around 60 to 80 percent charge where very little wear takes place to charge or discharge. If you could keep it to just that 20-30 percent usage in that range it would pretty much last ten thousand cycles.
Charging to 100 or discharging below 50-60 percent accelerates the wear on the battery, but it is still much better than the wear rate on lead acid batteries that are cycled in a similar manner.
Batteries also need to be balanced. If you constantly keep your battery packs in that small range they'll drift out of balance over time.
You should charge to 100% occasionally to allow the BMS to balance all the packs.