I made an oopsie in today's video and soldered a resistor where a capacitor should be, no harm though, just a few mA turned into heat during operation.
Anyways thanks to everyone who pointed this out, I have added some surface mount tech to the HitBit to sort this out:
Jobsa goodun, still seems to function, so this cap is probably belt and braces to eat any transient noise and stop the logic chip getting confused, either way, HitBit is alive!