So I got this 18-fold lithium ion battery, Milwaukee battery 3M hours and it has been used for about 3 years, good use, so it holds almost no charge anymore, so it's not very usable, you charge it and then you can use it for like 10 minutes and then it's empty. So yeah that's considered bad, so I decided I would like to take look inside. On the top you have this little button, so you can see the charge of the battery and as you can see if I push it one that so this battery is empty, but I also discovered another thing, if you push this button for like three seconds then it starts flashing a sort of coat and I was wondering what that coat does mean, is it something that tells you how much it has been charged or if somebody knows please put it in the comments, I'd really like to know it because yeah it would be nice, it sure is telling something but I'd like to know what, so if I push this three seconds you can see the lights flashing. So I see four torque screws here at the bottom, so I'll unscrew them and see what happens. So if we move, so yeah, the top's also, so at the top you can see the springs for taking the battery out of the machine, so if you have a look inside, there's a PCB up here, so all of five terminals to the battery, yeah this is quite a bit of electronics in here, so let's see if we can get this out, no no screws, one screw, so I take this one screw out, it's only holding with PCB in place, so this should come out, yes, it can do that, so there you have it, all the lithium ion cells, as you would expect it are 10 cells, and I think yet 10 cells in series, five cells in series gives 18 volts, so in this one two parallel, this is 1.5 mAh per shell, so that gives you a total of 18 volts and 1.5 3.0 mAh, so as you can probably see, the cells say Samsung HDI 088 and something like that, I can't iron air 18650 and then I think it's I3Q or one 3Q, so yeah I looked them up and as you can see there's some sort of sensor there, I think that's a voltage sensor to check if the voltage is correct or a temperature sensor of some kind, none of them on the other side, and it feels quite sturdy, so yeah, really nice, so as it turns out, Samsung HDI is a big manufacturer of the lithium ion cells and as they say on their website, they're the world leading manufacturer, so I didn't know that, so that's interesting, and what's also interesting is, these batteries turn out to be 1300 milliamps hour, so we know that five cells are in series and that two series are parallel, then that means we should have a capacity of 2.6 mAh and not as on the casing is stated 3 mAh, so yeah, that exaggerates a little bit, and also the inside of the casing is nice rubber mats to keep it in place, so yeah, this battery has seen obviously seen better times, it's been a good use for about 3 and I guess it has said about, yeah, maybe about 7 to 800 charge-ish, so that's not that's quite good, to yeah, that's about it so far, I'm not going to take it apart since the batteries are dead, at least they're very bad, so that's about it, thank you all for watching and if you have any more information about this battery, I'm really interested,