Conversation
アヅキデス 
coolbean@brain.worm.pink
ngl learning that the rechargable nimh aaa batteries have far higher maximum capacities (at the cost of lower nominal voltage) than li-ion ones has kinda ruined my day
like wow ok it only takes 2 li-ion ones in series to power a 5v device but have you considered: 4 ni-mh ones have 2-3 times the capacity and degrade less per charge cycle? lithium fucking sucks lmao
like wow ok it only takes 2 li-ion ones in series to power a 5v device but have you considered: 4 ni-mh ones have 2-3 times the capacity and degrade less per charge cycle? lithium fucking sucks lmao
1
0
1
@coolbean lithium batteries have like 4x the energy density?
2
0
1
@snacks please compare hr03 nimh batteries with their 10440 compatriots
1
0
0
@coolbean first reults for both and the lithium ones have about twice the energy still
2
0
0
@snacks snacks i beg of thee, 300-600mah vs 600-1200mah. the difference is in nominal voltage where lithium obviously wins which is why i compared it 2 lithium batteries to 4 nimh batteries (both the minimum required to power a 5v device like most microcontrollers)
1
0
1
@coolbean total usable energy is average voltage * capacity. Neither of these paramters matter a lot on their own since as you've said you can just put more or less in series
2
0
0
@snacks or lower voltage draw on the lithium ones so the device can run on both. yes i concede this point but even so you just about equalise with lithium's main draw being the stabler voltage
0
0
0
@snacks snacks fuck kinda nimh cells are you finding. 3.6v@600mah vs 1.25v@1250mah is literally only 1.5x. which the lithium cell equalises in only a handful of charge cycles cause they degrade down to 80% capacity in only like a hundred charge cycles
1
0
0
@coolbean where are you finding nimh cells over 900mah?
1
0
0
@snacks they go up to 1250 at the tippy top. the main reason its kinda annoying to find past 800 is cause nimh cells are mainly used as a *cheaper* option cause they dont require lithium
but honestly whatever. this argument wont matter in a few years now that k-ion batteries are entering production bringing comparable capacities to li-ion but the reusability and price of ni-mh
but honestly whatever. this argument wont matter in a few years now that k-ion batteries are entering production bringing comparable capacities to li-ion but the reusability and price of ni-mh
2
0
1
@coolbean the main draw of lithium is power and energy density. I still remember switching my first proper rc car from a good nimh pack to lithium and the difference was ridiculous.
It is staggering that a lot of modern chemistries are only rated for about 100 cycles tho
It is staggering that a lot of modern chemistries are only rated for about 100 cycles tho
1
0
1
@snacks next up: i demand the total abolition of batteries with non-standard sizes and terminals. no more "2-4x 18650 cells in a proprietary plastic shell" bullshit, im sick of it
1
1
2
@coolbean just lemme plop my 18650s in there without fucking with a charge controller that will brick itself if it figures out what i'm doing 
1
0
2
@snacks just lemme plop my 18650s in there without fucking with a charge controller that will brick itself if it figures out what i’m doing 
1
0
1
@snacks they love doing that for literally no reason. its one of their favorite activities
1
0
1
@snacks teehee my terrible solder joint broke. have fun getting a new battery cause god knows im impossible to disassemble anyways!
1
0
1
@snacks whats the deal with people being super scared handling 18650s anyways. like they're not any easier to short than other cylindrical cells, just the consequences are a bit funnier but even so like... just redesign the format slightly so you can screw a protective cap on the negative terminal
2
0
1
@snacks ill be honest we could do a lot to decrease the likelihood of accidentally shorting out batteries during handling
1
0
2
@coolbean one thing that really annoys me about lithium batteroes is that they will just die if you let them sit around for too long. Some chemistries are more susceptible than others but i do have some that have barely been used and are completely unusable now
1
0
2
@coolbean there's ocp that can be built in to cylindrical cells
1
0
1
@snacks not even mentioning temperature sensitivity
1
0
1
@coolbean i love when i go outside at a few degrees negative and my camera loses half it's charge
1
0
2
@snacks i love EVs spontaneously combusting because their battery heating element failed
1
0
3
@coolbean so it just heated up more in a specific spot or what? That sounds like a really retarded failure mode
2
0
0
@coolbean how would that make a battery go up in flames? The internal resistance goes up as they get cooler so at most it should warm the battery up again. Unless it was really really uneven ig
1
0
0