Tools and materials used Cosy Thermostat battery replacement

Health warning

Do not attempt this project unless you are competent, it involves soldering and other operations that can be hazardous. There are many places where this project can go wrong, do not attempt it unless you know what you are taking on. The author accepts no responsibility for any damage or injury caused by attempting a similar project.

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Scalpel – for cutting the label to expose screw holes on the base of the unit.

Long thin Philips screwdriver – to remove screws holding the unit together.

Side cutters – wire cutting and stripping.

Soldering iron, high quality solder and flux.

Shrink tube – to enclosed battery unit.

Hot air gun – to apply shrink wrap.

Voltmeter – capable of measuring voltages 0 – 5 volts or similar.

There are many good videos on YouTube showing the basics of soldering and using a voltmeter.