good afternoon YouTube these are eros cable modem batteries they're like the backup batteries that
go into your cable modems or imagine these might also go into the voice over Internet
phone adapters so yeah I'd picked up a bunch of these they come with two different types of
cells they're both LG's I think these are the newer version LGD a five three one eight six
five the other ones are these darker blue cells which I think these are an older model these are
the older ones LG CAS 31 so these are set up with four parallel cells to get 8800 milli amp
hours and then 8.4 volts so two series for parallel to have been processing a bunch of
these and you get a mix of these newer cells and the older ones and they've all been testing out
between thirty three hundred and thirty eight hundred milliamp hours and that's the pair
so I'm keeping these paired up and I'm also only testing them to four volts so when I say 3,800
that's for the pair just to be clear so let me show you how I open these things up one thing
I've done is left this out in the Sun and you leave this side up in the Sun for a little while
because there's a bunch of adhesive in here and I'll show you that when I get in there but let's
try to crack one of these open and we'll take a look inside okay so here's where I crack these
cells open so I've seen some videos online of using four sided scraper blade I didn't have
one of those but I have one of these two-sided blades you can see how this blade only sticks out
a little bit so it can't go in very far like if you are using a chisel or knife or something and
then what I have here since this is on a handle I have a piece of steel here to support this end
and then I line that blade up on the crack so you put the smooth side up and give it a pop or two
so you can see that's why you want the blade to be not very long because if it does go in there
we go that's what I look for is you got to get this into split and then they'll flip it around
and there we go and then usually flip it over and just pop the other side here you're not trying to
crush it you're just trying to crack the seam there and then there we go pop those open I'll
get a couple more of these done and then we'll we'll go about getting the backside off okay and
this is the reason you want to leave this side up because this is the side that's glued in so you
can see this side came out clean because there's nothing holding the cells in but you can see here
that is that is solids so this is a stiff bent putty knife one in 1/8 inch wide you don't want
it the full width of the cell because you don't want a short here but what you're trying to do is
you have to get that glue cut away you'll see when I get them open here so you just kind of want to
take your knotty knife here and what I've done is I put a slight bevel on there it's not sharp but
just to take it down so it's not blunt and then I also round it off the corners just a little bit
so I don't tear the heat shrink on the cells as much and you just want to work the blade down now
this one I have to be a little careful because I cracked the case right there and you run the risk
of coming out of the cell into your hand there but you can see I just push down so the first time I
just want to slice down there and get everything sliced on this face and then I come back here and
I go all the way to the bottom and then I just pry up a little bit you don't want to do it all
in one shot because you might accidentally slip and then you'll tear the heat shrink so you just
kind of loosen it up and then usually the second time around if you listen it'll start to crack
right up and there you go and there you can see all the glue or adhesive this is kind of a rubbery
adhesive not sure what this is if it's a silicone rubber or something it it doesn't melt but if you
heat it up in the Sun it'll soften up quite a bit because you have to get these blobs of adhesive
loosened up these older ones tend to be much worse so again I have to be careful on this one there's
a crack right there so usually if there's a crack I'll put it down on a surface so in case it slips
out I won't Jam my hand with this thing there we go so then this side is ok because it's intact you
just want to slide it down you're kind of just slicing that adhesive usually just go down once
and just kind of loosen things up a little bit and then come back and it's almost there like
I said these earlier packs I think they use like twice as much glue in there wow this one it's like
really in there but that's why you need this bent blade so you can get around the corner a little
bit this kind of work work your way in and you can see how much more glue is on arc cells than
on the lighter ones you really laid it in there let me get through the rest of these here I'll
get them cracked open and then we'll continue processing these okay now for the next step what
I like to do is cut off all the circuit boards so these are the battery management boards they have
four wires hooked up and you got to cut them one at a time because these are the sense lead
so the black and red or the power and then the white and yellow since the voltage on each end
so cut one wire at a time and clean off a little bit of this black stuff like I get rid of anything
that's gonna interfere with my cell holders so like that that blob there would definitely be
in the way get all the tape off I get the ends and here in the center you've got to get these
insulators off at that tape there sometimes this tape in the middle is underneath the glue that can
be a little hard to get up but it clears off the batteries so they fit in my cell holder so that I
guess there's a positive side to that yeah there's two pieces of tape on this side so you got to pop
that one off and that one and now you can fold it open and this is where you can see how the cells
are connected so you've got four positives four negatives all in parallel and then the two ends
are hooked up there and there so you can see right here you've got 8.4 volts and now the trick is you
got to separate these two I use a pair of scissors like this and do not cut all the way across I just
come in from this side give a quick snip and then turn it around and give it another snip so then I
take a razor blade and just give that a slit there so that one had been torn like that insulator is
torn there so just give that guy a slit now you can spread these part right there and I take out
these little spacers and now I get the scissors again and because my cell holders are set up
four pairs I want to keep this pair and this pair intact they're attached on that side so I'm just
going to come down here you want to cut all the way through do one single cut because if you stop
and try to restart you'll get a sliver here on the metal that you've left and then it's just a matter
of cleaning these up so I like to get these when I'm done they're ready to go into the cell holders
of course I'm going to do all the testing on them but I want to finish up all the cleanup here right
now I cut that balance cable off I fold that over so it's ready to solder to because I have to keep
it so the cells go into my cell holder again so that's the important thing I found was do all of
this now so you don't have to come back and do any of this after you've tested everything and you're
putting things back together so now this one there's nothing to cut off I just fold out over
and then here I like to cut that little bit off just so there's no sharp edges there and it also
fits into the cell holder easier and then here's another one just fold over and then this one
you've got to cut off the black on this side and you've got to cut that little tab off there and
let's see this one's got a yellow you got to cut that off and then I like to just flatten that down
so this gets folded over and then this one there's a little tab on the end trim that off and then
at the end I take a screwdriver handle and I just tap all these down smooth so that there's nothing
sticking up here this way when I come to solder in my fuse wires I can just solder right on to this
Center here and there you go so these are ready to go in so as far as testing but I'll do is measure
the resting voltage of these and if they're pretty similar I put them in my charger I've got a four
cell holder I bring these four pairs up to four volts and then let them sit a week or so check the
voltage discharge test and then I put them into another charger to bring them up to storage charge
so that's the cycle so it'll take about a week to get charged these up rest them discharge them and
then recharge them and I'm doing all the charging on solar so that kind of limits how many I can do
because I can only charge during the day anyway five of those modem batteries give me 20 pairs
and that's enough to actually build two battery modules these are my cell holders right off the 3d
printer and I haven't separated them yet so this would be bottom and top of one cell holder but I'm
just using them in the meantime to hold the tested cells these have been charged but not tested yes
so here's a group of cells I've already tested so you can see like this one three point two four
volts was the initial voltage tested out at 37 18 and I find that these groups of four will test out
pretty similar 36 ninety eight and then this one 36 69 and this one is thirty six seventy five so
they're all within maybe 40 50 milliamp hours yeah if you have any feedback on processing these or if
you've had an experience post up in the comment section below and as always thanks for watching