I've had this Logitech K750 for a few years and about maybe starting six months ago it'd be
unresponsive like you'd hit a key and it wouldn't do anything and I used to be able to just fix that by
moving out of the way so it could get the proper lighting because it's a solar powered
keyboard but then that stopped working and then the battery stopped charging there's
a rechargeable coin cell battery in this keyboard and the warranty has expired on this keyboard
so Logitech was no help and in fact on the website it does say the battery is not replaceable
but that's not true today I'm going to replace the battery and I'm going to show you how
to replace the battery I will also show you how it works after it's been charged for awhile
first this is the light meter button and as you can see that light is flashing green which
means it's getting enough light to charge the new battery once I put it in here is the
new battery in the box and the battery is actually in a bag so I'll just quickly pull
that out and here is the new battery as you can see and the new battery is a Maxwell ML2032
it's a rechargeable battery you don't want to put a non-rechargeable battery into the
keyboard it could cause a fire and it will cause the keyboard to heat up a lot because
it will try to charge it I have seen tutorials where somebody disassembled the keyboard and
then cut the connections to the solar panels so that they could put a non-rechargeable
battery in there but I didn't want to mangle the keyboard to do that so now I will quickly
slip the old battery out of the keyboard and then put in the new one now I will try to
take the battery out I've done it before it's pretty difficult but if you get the right
tool there's a slot right here and you just have to pry it out there will be a little
damage to the keyboard but you just pry it in there and there you go it's out the battery
fell on the floor and there's the old battery as you can see on the original battery it
says do not replace battery and it tells you go to Logitech support but that's pretty useless
because they're unwilling to help you even if you'd be willing to pay for them to replace
the battery they will not do it so I will just quickly peel off that sticker as you
can see I just peeled off the sticker there's still some of the adhesive left and it is
a Maxwell ML2032 and it says rechargeable on there and also made in Japan now that's
the old battery and there's the old battery and the new battery and you can see they're
identical so it should work the old one has a black stamp number on there of twenty I
believe and the new one has ninety nine so that's how you'd be able to tell the difference
plus the left over adhesive from the sticker so now I will put in the new battery and then
make a short video later after this keyboard has had a chance to charge the new battery
and tell you what the results are showing you the Logitech solar app and also proving
that the keyboard now works properly now I will put the battery back into the keyboard
this is the new battery as you can see there's no sticker adhesive on it and then you want
to put the worded side of the battery down so it goes into the holder like that so the
bottom is facing up and then you just slide it into the keyboard and there you go now
I will just quickly turn it back on as you can see by that green light that just flashed
it is getting enough light and the battery is in correctly so we'll push this light button
here as you can see there's a little green light flashing beside my thumb that means
the keyboard is receiving enough light through these solar panels on the top and the battery
should be fully charged within a few hours or so it may have a charge in it already since
it's a new battery but I'm unsure if these coin cell batteries come pre-charged like
triple A's or double A's but I'll be back in awhile to show how the keyboard works after
replacing the battery so the new battery did come pre-charged I'm actually surprised and
we'll press the solar app button on the keyboard where the green light was next to earlier
in the video as you can see it has a hundred percent battery and it says your energy reserve
is high and that's the normal reading once the battery is fully charged as you can see
by the lux meter I'm in a low light area but I normally do try and put the keyboard under
some direct light where it gets a higher reading of five hundred lumens for at least a few
hours a day to keep the battery going now the original battery probably did die because
of the fact of the it was being so old like I had the keyboard for at least two and a
half years I think I could be wrong and so that's probably why the battery stopped charging
because eventually rechargeable batteries do stop recharging so as you can see the solar
app says the battery is full now I'll just quickly open a notepad and I'll press the
Windows key on the keyboard and then just click on notepad and I'll just increase the
font size
and now the keyboard works like it should the keys responded immediately it does feel
funny to go back to the Logitech K750 I was using a Lenovo keyboard for awhile and it
did not have these chiclet keys like the ones that make the little tapping sounds not the
fat keys that most keyboards have or some older keyboards have but as you can see it
works and I'll press the Windows key again and there you go see that works and the backspace
everything works perfectly so instead of going to spend another eighty to ninety dollars
on a new Logitech wireless solar powered keyboard I spent fifteen dollars plus thirteen percent
tax on this keyboard by just buying a new rechargeable battery for it so when Logitech
says the battery is not replaceable they're not telling you the truth it can be replaced
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