good afternoon YouTube so today we have some of these for cell eros modem backup
batteries so these are again 8.4 volts but 4400 milliamp hours so they're set up as 2 P 2 s
and they're a little bit different than the eight cell they have the same little yellow
pulse strap so you take those off and I use pretty much the same technique to open these
and I put the blade right on the seam there and what you want to do is get this into crack so we
put it right there see one pops we got that to crack and the same thing here get it lined up
there we go yeah that one's crack then you flip it over and just repeat on the other
side for pops and we got it open and these have quite a wide variety of cells there's
Samsung Sony LG let's see there's a moly and then there's a one cell I haven't identified
yet it's red let's see maybe we'll take a look at some of these other ones just see
what we get here see that one didn't quite crack all the way so I've got
to give it a second pop there and the same down there I didn't get that in there we go
up didn't quite get it some of these are a little bit tougher there we go yeah there's
another Samsung there we go just got to get that in to crack that one cracked there
yeah these are the sony cells let's see let's just try one more here 1 2 3 4 and another sony
yeah now these are the earlier one they've got a really light adhesive and it peels right off
so this one here probably will come out too yeah there we go you can see it comes out clean where
these later model ones are really glued in there let me go put these in the sunshine what I do is
let the Sun Shine on the black plastic side and let those heat up for about 15 minutes and then
we'll try to get the cells out of there so we got our 10 battery packs here this time came out with
five of the Sony batteries there were two that had Samsung two of them had the LG's and then
there's these red cells you can't find any of these numbers that match up to anything you b3e
a Y something or other on there so these guys are glued in really tough so you need your bent
putty knife here and you just do the same thing it's the eight cell you make one cut down there
one down there give it a little bit of a pry like this one is pretty tough and you want to go down
this side because all the wires are on the other side there we go almost there you can see these
were glued in pretty good there the Samsungs same thing just down the size one doesn't feel quite
as tight there you go try it one more here and that one isn't too bad really helps if you set
the battery in the Sun for maybe 10 15 minutes on the black side it seems to soften up the adhesive
a bit yeah yeah and then these they process pretty much the same way as the eight cell except for one
difference so I like to go and remove all the circuit boards here you just want to cut one
wire at a time like I say I normally try to cut all the circuit boards off but I'll show you the
screen up here they're pretty much the same at this point I just like to get rid of as much of
the tape as I can any extra insulation and you get the tape off and there's usually a piece
or two on the side holding these together so you get the cells opened up like this so you have two
parallel connections on this end you're plus and minus and then on the other end there's two series
connections so these are wired as two series so it's this cell in series with this cell and then
it's this cell in series with this one and then the two series cells are wired in parallel yeah
so my battery holders work with paired cell so this and the positive and negative are wired in
parallel you got two positives and two negatives the other end is wired in series so I need to cut
this end but I've got to get this end apart so I can cut the other end so I take my razor blade
make a slice there turn it around and you want to keep your hands out of the way and you don't want
to cut across you just cut from the middle out now you can separate the two cells and at this
point these two ends should be pretty close to the same voltage but I do like to only cut one
side at a time so I snip that one and this one now I've got two pairs I've got the positives and the
negatives and I need to get rid of these tabs so that I can spot weld this end together and then I
have to get rid of those two tabs so I can spot well this end together so yeah usually you can
get these off pretty easy oh yeah that one came off pretty clean and then these are like to take
the insulators off the negative end they get in the way of spot welding the negatives you don't
need those and then these are the positive ends so these you want to keep the insulators in place
so there we've got that one and that one now it take these inside and spot well those two pairs
back together okay so once I have the cells all cleaned up I bring them inside I need to put them
in that as holder here so I can spot weld the ends so these were the two ends that were connected in
series to these two cells and the reason I have to remove the tabs is there's really tight fit
in this holder and if you don't remove the tabs off the top you can't get the new tab on top of
the old tabs yeah so there we go we've got the two new sets of tabs in there and then I come
along here so there we go I give them like two spot welds in the holder there and then I usually
come back and get one on the backside where it was inside the cell holder and I'll usually give it a
fourth one just to make sure it's good and tight and give them a little twist there so this is my
I charge er 4010 duo so this charger has two separate charging circuits in it and I have a
pair of four cell holders so I load all four pair out of two of the modem batteries in here because
these were all pretty close and so this one's showing three point five to six volts not sure if
you can see the display the error but I'll just hit that and I've got a 2 amp charging profile
loaded in here and I'm charging them to 4 volts per cell the reason I picked up this charger it
does regenerative discharging and it also can be powered off of a 24 volt power supply this charger
is connected to the 24 volt system so when I get to testing the larger modules like do regenerative
discharging from this into my 24 volt battery bank and I can do that like overnight and then
let me show you what I do next just to maintain consistency with my earlier testing I'm using the
same I charge her ten ten to finish charging the cells so you can see I've got a 2 amp charged to
4 volts going on and I've got another four pair of cells in there so the I charger is bringing
all these up to four volts so in this case the cells were 3.9 - out of the 40 10 duo charger so
it had shut off a little early so I just bring the cells in here and then top them off so this
goes pretty quick because the cells are almost fully charged yeah well wait till this finishes
charging and then we'll take the cells out and get them ready for the discharge test so that's pretty
much the process of going through these cells so yeah if you have any questions or comments leave
that in the comment section below and stay tuned for future videos as always thanks for watching