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Peripherals Replacement battery for a bluetooth keyboard

Discussion in 'Hardware' started by CrapBag, 10 Sep 2020.

  1. CrapBag

    CrapBag Well-Known Member

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    I have the following keyboard, RT-UMK-100-BT.

    It suddenly wouldn't charge and as I didn't use it very often it got shelved until I had a need for it again.

    I opened it up to find the battery all swollen so I presume that's why it doesn't charge anymore.

    I cant find out what exact battery it takes.

    It does have 5c 300ma on the back though.

    Anyone got any idea what battery I could use.
     
  2. play_boy_2000

    play_boy_2000 It was funny when I was 12

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    Pretty much everything is lithium ion these days, so you just need to find one that fits. Measure it and check out whatever your local version of digikey or mouser is.
     
  3. blackerthanblack

    blackerthanblack Active Member

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    I'm not sure if this would be better as a tech support thread, but anyway.

    The manual for the part does state lithium ion, so that's certain. The 5c will be the charge rate allowable for that cell, so could apply to any lithium ion cell.

    If you can supply dimensions or a photo that would certainly help?
     
  4. CrapBag

    CrapBag Well-Known Member

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    I cant find it again now but some where else mentioned the specs to be 3.3v 80ma.

    Edit...Just read this in the manual

    Power supply: Rechargeable polymer Lithium-ion battery
    Charging voltage: 4.4V ~ 5.25V
    Charging current: 300mA
    Sleeping current class1: 30uA
    Operation voltage: 3.7V

    The dimensions are 2" x 1.25" or 50mm x 22mm.

    Its quite swollen.

     
    Last edited: 11 Sep 2020
  5. CrapBag

    CrapBag Well-Known Member

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    Now the 300ma is pretty much how long its going to give charge for right?

    So if I purchased a lower rated one, say 200ma then it just wouldn't power the keyboard for as long.

    I can get a 200ma one for £2.27 or the full fat 300ma for £8.99.

    Its only going to be for occasional use (inputting text on my bedroom smart tv) and it used to last for ages anyways.

    I don't even know if it still works as it might not be the battery so a £2 punt seems the better option.
     
  6. play_boy_2000

    play_boy_2000 It was funny when I was 12

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    I'd say go with the 200mAh one.
     
  7. CrapBag

    CrapBag Well-Known Member

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    I found a 300mah for £2.35 so I have taken a punt on that one.
     
    pete* likes this.

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