Ubiquiti UniFi Cloud Key Gen2 Plus failing battery

(New UCK-G2-Plus produced after 3 June 2022 no longer have Batteries inside them)


Compact, desk or rack-mountable UniFi OS Console with a pre-installed 1TB hard drive.

Build, secure, and optimize your UniFi system with our compact, Cloud-connected controller.

CPU [green] and RAM [blue]    (click for larger image)


Check your UniFi Cloud Key Plus Battery

A lot of CK+ users (community.ui.com) report that the 'safe shutdown' function on their CK+ fails. It seems that battery in the CK+ isn't durable enough and users with failing CK+ devices also report bloated batteries after opening up the case of their CK+.

Testing this is easy: Just unplug the CK+ from either supplied power or ethernet cable if on PoE and see if the shutdown procedure is starting. When the battery is dead, it will just turn off immediately.


This is how things turned out around here...😎

The bloated battery might make it more difficult but not impossible.

That's one bloated battery! Fire hazard...

Removing the sticker.
Li-ion 3.7v 300mAh, serial operation 3.7V x 2 = 7.4V


CPU and RAM with an old PC CPU heatsink (video)
(temperature in degrees Celsius)

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Thermall conductive glue. CPU/RAM and heatsink glued together.


VALUE 19 inch server enclosure, 1HE, black. €52 ($55).
(I couldn't find 19 inch/1HE empty enclosure on Amazon.nl)

1TB Samsung SSD and SATA data/power extension cable


CLIFF CAT5e RJ45 feedthrough connector


Standoffs glued together with a glue gun.
Bluetooth antenna with an u.FL connector (grey coaxial cable).


Completed (click for larger image)