[Nintendo Switch News, Guides, Discussion , Develop] Nazo:
On the battery discussion, there's a little bit to the person's concerns, though overall they're misunderstanding a lot of stuff. Android systems do indeed intentionally fast charge batteries by choice and this isn't actually as ideal as it seems. No this won't destroy the battery and no Nintendo doesn't have any proprietary charging methodologies or etc, but they might intentionally be limiting the charge rate to maximize battery lifetime and this is a very real thing if so. Phone/tablet users as a whole want fast charging no matter what, fully with the intent to replace their devices every few years at the latest anyway, but when you buy a console like the Switch you typically want it to last a long time (plus you know how Nintendo tends to build their stuff to high tolerances -- even if they have been slipping a lot lately.) Fast charging is indeed more stressful to the battery, but no it won't damage or break it, it merely decreases its useful lifetime slightly. I do want to add that it's not just charge rate that matters, but temperature and voltage as well (which are, in fact, more important.) Of course a higher charge rate tends to produce a higher battery temperature. Obviously Nintendo has elected to at least choose to limit the charge rate. (And it's worth noting that even in the stock OS at the slow rate the battery does get a bit warm, so I'm guessing they really had to strike a balance here.) That, or maybe they were just lazy and simply didn't integrate fast charging into the system. (The lower charge rate is absolutely necessary when running at 5V since that already pushes around 3 amps from the power source, so perhaps they were just too lazy to make it decide smartly to use more current when it gets a higher voltage than that.) Obviously they didn't choose to limit the charging voltage (most people would hate that.)

It's not even a huge difference at first, but it's all the difference between a 2017 phone that is having a pitiful battery life and a Nintendo Switch from 2017 still having a fairly useful lifetime even if not exactly great (not that it ever was great.) Both are reduced from when they were new, but the phone is significantly more so (and let me tell you that games murder the phone's battery, but then Android gaming always did suck anyway.) I do think it has legitimately helped with my phone as its battery life is still pretty decent despite everything.

I do think that ALL Android distributions should actually take this into consideration more and give the user a bit more of an option as to which they prefer. Fast charging is great for the on-the-go user's lifestyle where one needs to charge that phone quickly and get going again and intends to toss it in the trash and buy the latest thing to hit the shelves in a couple of years anyway. But some of us don't tend so much this direction and a slow charge with a longer lasting battery is actually more suitable for us who feel this way. I've actually seen a bit of an inkling of this sort of idea in SONY's stock ROMs which was nice to see at least -- at least someone out there has had the idea. I really think this is something that should be ultimately up to the user as the choice is significant and affects how the hardware will be used.

To some extent the "acc" module (available for Magisk or I think can be manually installed on fully rooted writable systems) attempts to correct this for those of us who want to increase the overall lifetimes of our batteries. I find this particularly necessary on my phone because it *is* a 2017 phone ironically and never had a great battery (it's a cheap economy model) so the last thing it needs is for that battery to wear out. However, I've also found out the hard way that acc is pretty limited in what it can do depending on the system itself (and to that end I think the issue comes down to the OS more than anything. Which is LineageOS on my phone too.) In many cases it can even limit charge rate (albeit in a bit of a hacky way on some,) but in mine it won't. It can limit maximum charge percentage (which, voltage-wise, seems to work out to 92% being optimal on mine) but then it stops charging until the next reboot on that phone. I haven't had the chance to try it on the Switch yet, but my suspicion is I'll see similar poor support. At best a maximum percentage limit, not a rate limit would be my guess. (I do intend to try it soon though. My classic stays docked 99% of the time anyway, so a maximum charge limit would not be the worst thing in the world.) Ultimately the only real solution is that the OS itself -- which can handle this stuff at a much lower level than rooted/Magisk/etc software can do -- to allow the user to decide. If it had proper low level control it would be quite easy to limit charge voltage and current and there is definitely a notable benefit to doing so and this ultimately should be the OS's job IMO.

So, coming back to the ongoing discussion, this is more a matter to take up with the LineageOS developers themselves. And I have no clue how you'd even get in touch with them as I never even got really simple stuff like the volume steps fix to even reach their attention (and all that is is a simple change of some numbers in one single source file that would take mere seconds to do. It's worth noting that Google has ignored users trying to bring that one to their attention since the Android 2.x days, so I guess some things just get auto ignored. BTW, given its strong media focus maybe it wouldn't be the worst thing in the world if the Switch port had more volume steps hint hint.) Giving the user optional control over battery charging (preferably both rate and max voltage) is significantly more work to say the very least. Still, they are the ones to talk to about this, not the Switch port's developers. Such a thing needs to be integrated into the base system and then that would make it over to the Switch by default anyway. So to be clear, this is definitely not a Switch-specific matter and there are advantages and disadvantages both ways with Nintendo's choice likely making more sense for normal Switch use (but then a fast charge could be handy if you're about to head out the door and want to just charge it real fast. Thus it should definitely be a choice.) Feel free to see if you can have more luck catching their attention.