Nike Mettle DIY battery change

Nike's range of Mettle watches are getting rare now, so if you find a good one then it's worth taking care of.  If you'd rather not send it away for its battery change then you can tackle it yourself with a little care.  It's not a complicated process but you can damage some important springs and sprung contacts which will impair the future functioning of the watch (e.g. the alarm).

Anyhow, here's the procedure.  I'm using an Anvil, but the process applies to other models in the range.

Remove the four small cross-headed screws from the corners of the back plate

 Lift the back plate up and away - don't slide it sideways because this may damage the springs and contacts underneath.  If, like mine, there's a white plastic sticker over the battery then carefully peel it off

Now that the battery is exposed, remove the even smaller cross-headed screw from the retaining plate

Now you can remove the old cell

Install a fresh 3v CR2032, positive (+) side up, preferably not touching it with your fingers
Re-fit the retaining plate

Check that the rubber seal around the module bay is still intact and, if necessary, apply a tiny amount of silicone oil to retain water-resistance

Check the display, the light and, for completeness, the alarm tone, then re-fit the back plate.  Ensure the screws are in tightly but not over-tightly.  That's it, you're done!