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Introduction

This repair guide provides step-by-step instructions for replacing the Lithium-Ion battery pack "606090 3.7v 4000 mAh 3pin" in the AJAZZ AK820 Pro keyboard.

If your keyboard quickly loses power or does not hold its charge in Bluetooth mode, replacing the battery can restore normal operation.

This repair requires opening the keyboard case and disconnecting the battery from the main board.

Before you begin the repair, power off the device, and make sure you ground yourself to get rid of any static electricity.

Caution: If the keyboard becomes unusually hot, the battery appears swollen or puffy, or you notice a strange odor, the battery may be swollen. Review the What to do with a swollen battery guide before continuing. Swollen lithium-ion batteries can catch fire or explode if handled improperly, so use extreme caution.

What you need

Step 1 Battery

AJAZZ AK820 Pro Battery Replacement, Battery: step 1, image 1 of 2

AJAZZ AK820 Pro Battery Replacement, Battery: step 1, image 2 of 2

Pull out the volume knob first to allow easier access when separating the frame.

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Step 2

AJAZZ AK820 Pro Battery Replacement: step 2, image 3 of 3

Insert a nylon spudger or opening tool into the seam at the marked location.
Gently slide the tool along the edge of the body to release the plastic clips securing the two halves.
Work slowly and carefully to avoid breaking or bending the clips.

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Step 3

Carefully lift the top portion after separating the two halves.
Do not pull them too far apart, as the battery cable is still connected.

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Step 4

AJAZZ AK820 Pro Battery Replacement: step 4, image 3 of 3

The red marker indicates the battery cable and the connector.
The orange marker indicates the location of the USB-C port to help determine the correct orientation.
Remember the original cable orientation, as this will be important when installing the new battery and reconnecting the cable correctly.

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Step 5

AJAZZ AK820 Pro Battery Replacement: step 5, image 3 of 3

Use a pair of tweezers to gently pull out the cable connector from the socket on the board, then follow it to locate the battery.
If the tweezers aren't working, use the point of a spudger to push on alternating sides of the battery connector to "walk" it out of its socket.
Don't pull it out by the cables, as this may damage the device.
The battery is right below the foam and rubber padding.
Remove the old battery.

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Step 6

AJAZZ AK820 Pro Battery Replacement: step 6, image 3 of 3

When installing the new battery, reassemble the layers in their original order.
To connect the new battery cable, align the connector and use a spudger or clean fingernail to push it fully into the socket.
Don't push on the cables themselves, or you may damage the connector.