Danger
Potentially Dangerous
Injury may result if this procedure is not followed properly. Use caution and follow all warnings.
Danger

Introduction

It is almost impossible to buy new ML2032 battery to replace old one.

Logitech support will not help you and the do not have this as a spare part.

Maxell - battery manufacturer answered me this: "Unfortunately ML type batteries are industrial batteries which we sell to OEMs only. Due to strict health and safety purposes we are not allowed to sell this type of batteries to endusers."

The claim from Maxell is also the reason why I do not believe buying this form eBay nor Amazon.

So I decided to modify my keyboard. If you disable solar pannels, there will not be any charging for the battery and then you can use regular CR2032 battery which is easy to buy.

And since I did not find any guide like this I decided to share the steps with you.

  1. The battery tray is near the top edge of the bottom side of the keyboard.  It is designed to be easy to insert, difficult to remove.
    • The battery tray is near the top edge of the bottom side of the keyboard. It is designed to be easy to insert, difficult to remove.

  2. I used a putty knife to force the tray back out.  Just push it into the gap along the bottom, then angle the handle to direct the force of the tip away from the body of the keyboard.  A few taps should get you this far.
    • I used a putty knife to force the tray back out. Just push it into the gap along the bottom, then angle the handle to direct the force of the tip away from the body of the keyboard. A few taps should get you this far.

  3. Once you get the "ears" past the edge, just slide the tray the rest of the way out.
    • Once you get the "ears" past the edge, just slide the tray the rest of the way out.

    • Note the battery type carefully: It is a ML2032, which is rechargeable. It is NOT the same as a CR2032, which is not rechargeable. Putting a CR2032 in here is a recipe for bad things to happen.

    • Note the proper orientation (see picture), positive + symbol facing towards bottom. Negative side facing keys. Slide the tray with the new battery back in. The battery can be oriented incorrectly and NOT work.

    • If you want to make it easier to remove the battery the next time, you could trim the ears slightly. Or slice some notches in the plastic "springs" to weaken a little.

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  5. Steps are described in this guide Logitech K750 Keyboard Battery Replacement. Turn off the keyboard before removing the battery. This battery can be dangerous so be carefull. For more details read Maxell Product Safety Data Sheet.
  6. Be careful to not crack the plastic deck. Don't pull it off hard. Be careful to not crack the plastic deck. Don't pull it off hard. Be careful to not crack the plastic deck. Don't pull it off hard.
    • Be careful to not crack the plastic deck. Don't pull it off hard.

  7. Remove the seven black Phillips screws. Remove the 22 silver screws.
    • Remove the seven black Phillips screws.

    • Remove the 22 silver screws.

      • Your model may only have 21 silver screws.

    • Put the screws somewhere into the bowl to not lose them and try to remember the position of the black ones.

  8. Unclip the back pannel from the front (keys) pannel. When you flip the (keys) pannel you can notice that both solar panels have a pair of cables. When you flip the (keys) pannel you can notice that both solar panels have a pair of cables.
    • Unclip the back pannel from the front (keys) pannel.

    • When you flip the (keys) pannel you can notice that both solar panels have a pair of cables.

  9. I have decided to desolder the long cable (red and green one) because they are far away from the logic board so I will not transfer heat to it while desoldering them. Tape desoldered cables so they do not come in contact with anything. Tape desoldered cables so they do not come in contact with anything.
    • I have decided to desolder the long cable (red and green one) because they are far away from the logic board so I will not transfer heat to it while desoldering them.

    • Tape desoldered cables so they do not come in contact with anything.

Conclusion

To reassemble your device, follow these instructions in reverse order.

14 other people completed this guide.

Endrju

Member since: 09/11/2015

441 Reputation

1 Guide authored

39 Comments

How long did the CR2032 battery last in use?

I'm thinking not very long so I'm considering attaching a CR123 (big 3V photo lithium battery) holder to the underside and wiring it in.

Thanks for the guide!

Don Barthel - Reply

Hey... Without turning the keyboard off, its working very well.. Solar App still showing that the capacitiy is High and status is Excelent :-)

Endrju - Reply

Battery still works like a charm without any notice of capacity drop (if Solar App provides correct readings)

Endrju -

Less difficult: I just covered the solar panels with thick 3M black tape. No charging according to the solar app and keyboard working fine with CR2032 (until replacement ML2032 comes in from China...)

Aquadrat - Reply

Hey, thats a pretty good tip - I'll use that when battery in my mum's K750 keyboard goes away.

I would just ensure that Solar App is showing zero in under a direct light of your desk lamp.

Endrju -

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