Ubiquiti Cloud Key Gen2: How to replace faulty battery

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Introduction

First you have to tear down the device.

You will find some videos on you tube describing how to tear down the CK.

Unfortunately after some years of lifetime a cloud keys battery can lead to a non working device or instability. I also recommed getting rid of the original 2.5" HD for thermal and performance reasons.

Step 1 Battery and Harddrive

Ubiquiti Cloud Key Gen2: How to replace faulty battery, Battery and Harddrive: step 1, image 1 of 1

Because of the original batterys special form factor it was impossible to find sth that fits. I found a Lithium battery from a model aircraft shop with 7.4 V and 280 mA

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Step 2

Because this battery is larger than the original one I decided to mount it in the HD cage. I replaced original HD with a Samsung SSD. Take out the SSD of its housing for having more space. As you can see I mount a cable from the place of the original battery to the new place in the HD cage. The SSD will be auto formated by the system !

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Step 3

Soldering the original battery connector to the cable. Battery has 3 lines

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Step 4

Replacement battery fixed with cable ties. I wrote down the colour assignment of my cables and put it in the HD cage.

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Step 5

...the old battery

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Step 6

mission accomplished :-)

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Step 7

After some weeks of not using the device the shutdown function did not work. After checking some UI forums I found out there is a circuit board inside the dead battery.
I also found 2 LiPo cells with the suitable Watts and Voltages. Unfortunately my charging board is faulty. So I did further test with ordinary alkaline batteries.

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Step 8

I testet 6x AAA batterys. This scenario also works, but there will not be enough space in the HD caddy. Finally a 9 V battery block did the job.

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Step 9

As I found out the newest generation of Cloud Keys is produced with no battery. I just had 2 new CKs, both switched off immediately when loosing PoE power. It seems with new Unifi OS the device can deal better with powerloss.

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