Hacker News new | ask | show | jobs
by emn13 2729 days ago
This is so misleading as to be false.

Batteries do not all degrade alike; not even close. There are huge differences in the rate of decay, and those are significantly impacted by the way the battery is used in the device (particularly maximum charging level, temperature, discharging level, power draw, charging rate) and the quality of the battery.

Apple did NOT do a good job of degrading performance along with it; because if they had, they could have degraded performance before the battery became damaged. As a ballpark, I'd expect a life extension for the iphones in question by at least a factor 10 would be technically fairly simple and affordable; i.e. this isn't peanuts that apple left on the table here. A 10 year life expectancy is totally doable.

So a battery as old as the decaying iPhone batteries need not have decayed significantly, as should be obvious considering that not all phones (let alone other Li-On battery devices!) degrade to this extent. The fact that iPhones did decay like this is almost entirely due to choices that Apple made (even if they made those choices without considering the consequences). Apple is pretty competent, so I'm a little skeptical they didn't know they were pushing the edge of what's reasonable, but sure, maybe it was incompetence rather than intentional penny-pinching or planned obsolescence.

User choices can matter too, but given how locked down these devices are and how managed the environment and how technically nuanced the necessary user actions are to have an ameliorating effect it's unreasonable to assume users had any practical ability to avoid this outcome.

1 comments

Can you please expand on how users can maximise battery longevity through their charging and usage techniques?
Sure: try to avoid the phone getting hot; don't charge the phone when it's hot; and definitely don't use the phone while it's charging if doing so causes it to become hot. Problematic phones are probably tuned to close to the physical limits; so "retune" manually: disconnect the charger before it reaches 100% (even a few percent matter). Never use quick charging on phones that are living near the edge like this (or accept that each time you do you're doing a little damage to the cells, so use it sparingly). Similarly, don't run the phone completely to 0% charge. But also don't recharge constantly after each tiny usage.

It's much harder for users to do this reliably than for the battery controller. Damage is maximized when all factors align; that's e.g. why controllers automatically turn of quick charge for the last few percent; similarly you can get away with violating a few rules without too much damage as long as you don't violate them all.

Finally, 0% and 100% charge are nebulous floating concepts. What you're really guessing at are the voltage levels in the cells - but again as a user it's kind of hard to guess those in a simplified UI. Is 95% worse than 5%? Typically high charge is worse but... who knows, without knowing what the controller actually interprets as those percentages.

I've never looked, but I'd be willing to bet you can find software to do most all of this automatically on a rooted android; to what degree you can automate care on other platforms - I'm not sure.

But again, the whole situation is mildly idiotic: all of these things the battery controller/OS can do too, and probably better that any user. There shouldn't be a need for much user handholding. The only thing the OS really can't do is choose for you when you're willing to accept a small amount of damage for a temporary dash of extra charge or quicker charging; a feature that by default kept your battery in "care mode", with a temporary toggle to charge more quickly or to a higher level.

A quick google find stuff like https://batteryuniversity.com/learn/article/how_to_prolong_l...; and research articles such as https://www.nttdocomo.co.jp/english/binary/pdf/corporate/tec... and http://publications.lib.chalmers.se/records/fulltext/249356/... and https://res.mdpi.com/batteries/batteries-02-00013/article_de... - and I'm sure there are hundreds more. It's not too hard to find info on Li-ion battery degradation, but it's a little much to expect even expert users to actually do much about it (IMHO).