Apple actually did this on the iPhones once. It was a PR disaster when someone found out charging past 100% did something.

I don't remember ever hearing this, and a quick google search comes up empty. Skeptical about this claim.

Phones lie about being at 95-100% charged, because it's bad to keep charging them when at 100%, it stops, waits for it to go down over hours, and charges again.

But then people complain it's not charged to 100% even though they left it charging all night, and because it's easier to lie to people than teach them stuff, they lie.

Or you just market your 1000 mAh battery as 950 mAh battery. But, uhhmm, honesty and marketing...

If you can't charge the battery to 1000 mAh, then state so.

Note that Apple doesn't specify battery capacity spec on iPhone.

You can charge it to that, but you don't want to keep it there, will cause the battery to age faster

Phones reporting 100% charge are usually at around 97%:

https://www.androidauthority.com/how-long-phone-charge-30646...

In old Android phones you could even get those additional 3% by unplugging at 100%, seeing the battery immediately go to 97% and then plugging again. My old Galaxy S4 Mini would even report 94% in such cases - I originally found out about this due to this discrepancy.

The iPhone gives you more of a "gas tank" indicator, as in that 1% charge left is actually closer to 10-15%. Same with 100% - hell knows how much it really is.

Source on this?

If you do that, it skews all of your figures for "kwh per kg" and "kwh per m3". I'd suggest that those are far more important figures of merit for design of electric aircraft and vehicles.

You may have meant this ironically/sarcastically, but it is entirely true. I'm a very happy owner of a fast-charging EV6. For longevity, slow overnight charging almost always just goes to 80%. I only need about 25% of the pack for my daily commute, and lithium battery degradation is dominated by time at high state-of-charge and temperature.

For road trips, the battery charges up to 80% capacity in about 18 minutes on a fast charger (with some caveats when its cold). Charging rate rapidly falls off with increasing state-of-charge, so you're almost always better off just hitting the road at that point. But since you don't actually discharge all the way down to zero, the fast charge cycle realistically only takes 12-15 minutes. The only times that I've taken it to 100% (125%!) were immediately prior to a road trip segment on the overnight slow charger, or for a quarterly balancing charge.

That's all with today's technology on a commercially available product. So this technology can only offer an incremental decrease in weight and/or increase in range.

Damn researchers being honest.

Actually I'd be fine with that marketing if all claims on battery life and autonomy were based on what they call 100% (i.e., the actual 80%).

First commercially viable lithium metal solid state battery charges to 100% in just 15 minutes!*

*using base 9

could also say it charges to tesla 3 capacity in under 5 minutes