337
Infinite energy trick
(lemmy.world)
Quick repost before this disappears
No, but you did break the battery controller
Last time I attempted this, I threw my back out for a week.
7/10 will try again.
It’s a lot easier if you get a couple of your ribs removed
I recognize why power banks can't charge and discharge simultaneously. But surely, with as cheap as integrated circuits and voltage regulators are, we can have a power bank that can be charged while it redirects some power around its cells to a device on the other side?
Sure, both would charge at half the speed. But if you only have one brick, it's better because you don't have to swap the cables halfway through. Plus, if your phone charges faster than the power bank (which it almost certainly will), you can unplug it at full charge before the power bank is done and let the bank finish- or unplug both and have a fully charged phone and a partially charged power bank.
Made even better, what if we integrated a power bank into a GaN charging brick? Plug it into the wall, use it to charge your devices every night, the smarts inside it regulate the battery with charge/discharge cycles; but then when you're ready to go somewhere you just unplug it from the wall, flip the prongs back inside, and go. Maybe you could even push a button to tell it to charge to full. It would also be a UPS of sorts, since it wouldn't know the difference between a power outage and you taking it on tour. Yeah, it would need to be kinda big and bulky when it's on the wall, but the convenience of not needing to track it down and plug it in before you go on vacation would be worth the hassle of needing to plug it into the bottom outlet on a power strip. Something about the size of a MacBook charger, but with all the high-wattage stuff swapped out for battery cells.
That's called Pass Through. Some battery banks do have that.
All u did was decrease the life span of power bank
I nearly did this by accident a few nights ago. I was worried I almost killed it.
Most banks can't charge and discharge at the same time.
If they did, worst case it heats up as it moves the energy around until it runs out due to losses or blows up.
Nothing that can go wrong really.
...or blows up.
Nothing that can go wrong really.
hmmm
Yeah, that's actually worse than I thought it might be, lol
In this house we obey the laws of thermodynamics!!
No you shorted your battery
I'm pretty sure both directions are regulated, and the only reason it went up is some slight change in the voltage reading due to temperature or somesuch. All that I believe will happen here is that the battery, due to generating a bit of heat, will discharge itself at a safe rate.
I'm not sure though
the power output and the charging input are both regulated and (almost certainly) current limited. So I think (not positive...) that you're basically dissipating your power in the inefficiency the charging and output circuits, with this power coming from the battery.
The inefficiency should (I think...) just be the round-trip inefficiency of the charging/discharging of your power bank
this should be way, way less than the short-circuit power dissipation.
The simplest toy model is to take a battery and try to charge itself. So you put jumpers on the + terminal and you connect those to the + terminal, and same for - (charging is + to +, NOT + to -). But this is silly because you've just attached a loop of wire to your terminals, which is equivalent to doing nothing. With charging circuits in between things get much more complicated, but I'm not sure if it goes full catastrophic short...
I think you're right and I was just memeing, but I'm curious how the battery percentage went up
I guess that running power in a circle like that as fast as possible might heat up the battery, which reduces internal resistance, which increases battery voltage during load, which tricks the sensor that uses voltage to estimate charge.
It similar to when a fully charged but very cold car battery cannot start a car, as if the battery was discharged. Then you turn on the cars lights for a while, which to the cold batter is a significant load. The battery heats up, and then you can start the car.
I think the charge controller counts the amount of energy that has passed through it.
You're probably mostly correct. Some of them do literally count that, but (to my knowledge) most measure voltage as a battery with lower charge usually outputs less and vice versa.
My guess is it didn't, and the numbers were pulled out the OP's ass.
Otherwise, idk how power banks monitor their percentage of charge, but being that it's a percentage, if you fuck up the capacity, the same amount of energy will take up a higher percentage of that capacity. /shrug
I'm curious how the battery percentage went up
Physicists hate this one weird trick...
Does burning down your own house count as science? Give this guy a medal!
No anymore, but if you destroy it in some more interesting way...
Is that true though? As in, is it really that dangerous? It seems that you'll dissipate power equal to the inefficiency times the nominal charging power, so something like 5V x 2A x inefficiency (inefficiency being 1-efficiency), which will probably be of order a watt.
I can use my car battery to charge itself without any issues
I just plug the red terminal to itself, and same with the black, which is to say, a battery is always connected in a way that "charges itself."
I think the key is that the battery probably isn't really playing a big role in OOP's setup
electricity doesn't "go through the battery," it just goes from the charging input to the power output circuits, with the additional power (due to inefficiency) being provided by the battery.
Battery pack loopback test successful...
Just informed to the Nobel comittee.
Yea just gotta bring it on a plane and strap a coundown timer to it that makes loud beeping sounds
Rip BMS
My heart can't take it anymore
this post was submitted on 10 Jan 2025
337 points (94.2% liked)
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