spikenzielabs Solder:Time 495, Quick Start Manual

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Solder and trim the leads.
You may want to peel the thin clear protective layer from the LED. Use your finger nail to lift an edge and then gently peel it off.
Button:
Push the button into the PCB. It should almost click into place.
Solder and trim the leads.
Assemble the watch body:
Battery holder:
The battery holder is very light and likes to move around as you solder it. Solder it in place with the open edge facing down.
Taping the battery holder in place, with masking tape, while soldering it works best.
Another way to solder the battery holder without tape is to heat the pad and battery holder by placing the tip of your soldering iron on the PCB’s
battery pad and just barely touching the battery holder. After a second or two add some solder. Once one pad is soldered, do the other one, and
come back to add more solder to the first one if required.
I’ve tried soldering a blob of solder onto one of the pads, and then heating the battery holder ... this didn’t work.