can you replace a cmos battery with a capacitor and why didn't they do this in the first place
>>107790176>button cell battery can hold a useful charge for a decade>capacitor of the same size can hold a useful charge for a few seconds
>>107790208>in 1 day your charge will be gonewhy would you leave the computer unplugged for a day thoughand you can always just ntp sync, i still don't get it
>>107790218>i still don't get itbecause youre fucking retardedask chat gptin factnext time you wanna post anything, which will 100% be cognitohazard-levels of retardationask chat gpt firstholy fuck
>>107790233calm down reddit
>>107790261>reddit is when you get told youre mentally retarded as in: arrested developmenttoo bad i dont give a fuck
>>107790218>Why not replace with a capacitor The whole point of a capacitor is to keep voltage steady. If there is a drop then power will come from the capacitor so there is no gap. It doesn't store power long term enough to be useful for powering the motherboard. >Use NTP For time, but what if you had other settings saved in the BIOS? I don't know about you but I don't want to set all of those again because I left my computer off for a day.
>>107790176i actually unironically prefer this over all the fucking "buy apple product" and "retvrn to windows 10" ragebaits i like your style, have an updoot
>>107790341>what if you had other settings saved in the BIOSCan't you just in the UEFI instead there's a partition save it on flash, come to think of it why even use a battery at all
>>107790341its not the only use for a capacitor>ntpthe mongoloid fucking retard doesnt see anything wrong with having to be always online to maintain your bios settingsim speechless
>>107790176The og Xbox had that. It was not a wise idea.
>>107790176That is, quite literally, what the original Xbox did. Its realtime clock is kept (for ~3 hours) by a supercap when it's unplugged from power, rather than say a CR2032 like the Saturn.
Why do most PCs still use CR2032s for backup when similar things like timer lights and alarm systems all switched to little 3 cell NiMH packs ages ago?
>>107790427you mean the tiny things that go in watches?less fiddly i guesssometimes you want to remove the battery to clear bios settingsyou then have to put it back in its place
>>107790409in addition to the xbox doing it, many early pc's use a ni-mh rechargeable battery for the cmos/clock backup. watch any old computer repair youtube channel and you'll see half the repair is often just repairing the damage those cause when they leak. now of course, they shouldn't leak during their typical lifespan
>>107790176>huh!? you swallowed it?Swallowed what?
>>107790483a cmos battery
>>107790483hopefully the battery
>>107790452Nah they're little heat shrinked packs with dupont-style leads coming off them. You see them all over the place in commercial lighting control and alarm systems for keeping the RTC if the power goes out. They last like 20+ years before you need to replace them.
>>107790502this looks like massive overkillyou need a minute amount of juice to maintain bios settings
>>107790427They're small, cheap, ubiquitous and last an extremely long time in this particular application. There's just no compelling reason to change things.>>107790502Not many people keep motherboards for 20+ years, and even if they do they'll be long-since obsolete. Any board from at least the past 15 years also has a secondary way to back up settings via the use of profiles that can be backed up anywhere, rather than just relying on the CMOS battery.
>>107790176Plenty of mobos used rechargeable batteries or even super capacitors. Also bitch give it back!
>>107790502cheaper than a suitably-sized lithium primary cell, or a li-ion/lifepo4 rechargeable, the charging circuit is simpler as well>>107790525many old pcs/computers used them, but as the clock/cmos chip process advanced and used less and less power, a cr2032 could suffice
>>107790577>super capacitors in mobos.which ones? because i never seen one, and i tinker with pcs from the 386dx up to now
>>107790525these days the sram behaviour is emulated and you don't actually need the battery to keep bios settings, it's only needed for the clock
>>107790583extremely old thenmy 386 had a cr2032
>>107790603a-hah. interestingi thought these solutions are still more expensive than using a battery
>>107790176Basically, it is very hard to get a capacitor to retain a significant ammount of charge for a long time in real conditions without it leaking away. Also, iirc the way charge scales with the geometry of the capacitor results on them needing to be bigger than a battery storing an equivalent ammount of energy.Also, capacitors have a shorter lifespan than batteries, or at least used to do so in the past, and replacing them will require resoldering.
>>107790725No replace nothing, buy a new mobo my guy
>>107790176the real question is why do they still insist on using volatile memory for that>but you need to be able to reset it easyjust have a chip that resets if you touch 2 pins together, its easy
>>107791686>VARTAeven chinesium is a better quality than this crap
I have a Raspberry Pi without a RTC battery AMA
>>107790176I would hate to even think about modding my CMOS battery. Turn the power back on and do something useful with your computer
>>107792060>both a battery holder and a capacitor are two leadsCome on pussy, just don't get it backwards or it might explode
