Hi, This is just going to be a quick video confirming a claim that uh Kip K made in a recent video a day or two back about how you can determine the state of charge in an alkaline battery by actually dropping it onto a surface and one that is fully charged will, uh, won't bounce nearly as much as one that is, uh, empty. So I thought I'd Uh, just test this now. I was originally going to uh, do this as like a a more scientific like investigation because in the Kibk video, it was ridiculous. He used two different brands of battery.

you know, that's that's just crazy. So I thought I'd at least do like a proper scientific investigation controlled experiment kind of thing where I Dr uh controlled the drop height out of tubes and I got different brands and makes of battery and I controlled the discharge rate and measured the capacity and all sorts of uh stuff like that. But I just decided no I'll just do a a very quick video to see just off the bat, just dropping a couple of the same brand, same batch battery and see if it actually works. So here it goes.

So this is not my scientific investigation, this is just a quick confirmation and I'm going to do it in one shot here so that nobody thinks you know there's any tricker, trickery or anything going on here. Now the claim of course is that if you drop batteries like this, here we go. If you drop them like that, a fully charged one, a full battery will, uh, sort of won't bounce as much as an empty battery. And what I've got here is I've already discharged Uh well, I've got duracel ones here and I've got Vara brand alkaline and I've already discharged one and I've marked those with the black marker on top so they've already been discharged and I discharged them on my electronic uh load over here at half an amp and this has got a battery discharge mode on it I discharged at half an amp until they reached Uh 0.8 volts and you can see that the V ones, um are definitely.

you know there it is trying to draw half an amp, it's only half a volt. Okay, so this is pretty crap if I can get that back out. Sorry there we go. and the Duracell one is how has a little bit more charge but it's down to8 volts at half an amp so not a problem now.

I'll measure these with my meter and the to make sure the other ones are good. Here we go. sorry I got to get into one shot otherwise people will think I'm uh, having them on. so these are the flat ones.

Of course they've regained a bit of the voltage cuz they're under no load there. but uh, trust me, they're Well, they're fully discharged if you know your battery chemistry. There you go: the brand new uh Vada and the brand new Duracel. And yes, they're from the exact same batch.

same packet. Okay, so we have a nicely fully charged and essentially an empty one and I was going to weigh them with Precision scales and all that sort of stuff. but this is not my scientific investigation so I'm going to just switch my GoPro on here. so I can uh capture this and here we go and in high speed.

So maybe I'll get some highspeed footage out of this thing and I'm going to drop them onto my rubber ESD mat here which of course isn't the best uh experiment. It isn't the best surface cuz this thing is going to vary based on Surface now I Originally thought that um, you know it'll be hard to differentiate this thing. It wouldn't be as simple as the Kip K video, but here it goes. Okay, here is a fully uh charged one: I'm going to drop it from the height of the battery and and it almost went with a thud and I can actually get them to stand up as claimed in there we go go as claimed in the CK video now I will drop the discharged one and you'll notice that it bounces more.

It most definitely bounces more than the other one and it is. I Oh there we go. I Can get it to stand up, but even on this rubber ESD mat which is going to absorb some of that impact and dampen that, um, you can clearly see that the empty one does bounce more. So there you go.

I'll try a few different surfaces. Let's get a uh red PEX uh base here and let's see what happens here. We go empty. You can see that it bounces a couple of times.

So let's get the full one and see more of a thud. You don't get that second bounce. Really, it there we go. I can't get it to stand up.

It's often a bit difficult from that height. if for go from a lesser height you've got more chance of that and I was going to do a proper drop rig with like a tube that control drop them and stuff like that. But as you can see you can see even on this kind of surface it makes a difference. Now let's get the V ones here.

The V brand here we go here is the fully charged one and you can see it just does that sort of single thud. There we go and the empty. it bounced at least that second time. See it, it bounced much higher.

Maybe I should be able to get that on the Uh GoPro There we go. I Got it to stand up. but as you can see it really does bounce a lot higher. It's hard to see them both at the same time.

But yeah, this isn't the best surface so let's try uh some other surfaces. I will have to eventually. Um, swap camera shots. Fully charged? There we go.

We really only get that single sort of thud. There's a little bounce in there, but now the empty. see? Look at that. Definitely you can get it to stand up still.

but it certainly is. There's much higher bounce on that and at the same time, there you go. So that's definitely confirmed on on you know, most surfaces. But yes, it does make a difference what surface you're on.

Let's try another table surface here here we go. Fully charged, Thud. empty. Definitely.

Huge bounce. Look at that same time. Yep. big difference.

Oh see. Almost got the empty to stand up there and the V one empty. Huge bounce and the full. not nearly as big a bounce.

thud. So there you have it. That is. uh, myth confirmed.

Really, it does do it. but it's in practice. It's probably not as easy as Kip K makes out because you sort of. you know you have to know about the surface I am able to get some of the empty ones to go.

thud I haven't done. You know, a complete, uh, scientific thing here. This was just a quick test to confirm it, but definitely it does do it. But really? I think in practice, you got to have a good one and a bad one to be able to, uh, compare on a given surface.

I think So there's obviously some sort of, uh, electrochemistry effect that's happened inside there that affects the uh, dampening inside the battery, the vibrational mode, and dampening of the battery. But like I said, to get you know to really understand this process, you'd have to go into the chemistry of these things. you'd you know have to do proper uh, vibration and drop testing with accelerometers on them to get some. you know, really good data and uh, stuff like that I don't have the gear to do that anymore I used to.

but anyway I thought that was rather interesting and yeah, myth confirmed. Uh, would you want to use it dayto day? I Guess in a pinch you could use the technique to determine whether or not it's empty. but the easiest way to do that is to stick the battery in your product and see if it works. If it works, it's good.

Catch you next time. Um.