Emergency Garmin FR220 charger clip.

OK.. i'm in the far south of Sulawesi at a lovely cabin stay and want to log a run... bugger... the 220 is at 10% and i forgot the charger clip.
The USB clip and fr220 have 4 contact points so i assumed there were normal USB connections.
 +ve, data, data , -ve
Nothing on google.... and i didn't have a multi-meter or test LED with me...

Ah. stuff it..
I cut a generic USB lead , cut the two data wires which left me with the red and black.
Stripped them and pulled one strand of the fine copper wire , folding the rest back out of the way.
This gave me a very fine probing wire that would act as a very crude 250mA or there abouts fuse.
I tossed a coin to choose if the black goes to the left or right contact on the back of the watch.
Looking at the back of the watch, contacts at the bottom i connected Red to the left , Black to the far right. "Beep"... sounds good.. struggle to turn the watch over... bugger the watch was coming back from a reset.  I swapped the wires and tried again, this time facing the screen side at a mirror.
"Beep" ... but this time the watch went into its normal 'Charging' screen.
Well that was easy.

Now to make the clip... Cardboard with its ribs running up and down the watch should be stiff enough but allow the tabs to fold around the watch to hold the contacts against the pads on the back of the watch.

Trace around the watch, leaving room at the sides to not press on the buttons ( we don't want it going into Test Mode do we ;-)

Tracing showing rough location of contact points.

With a pin i then poked holes through the cardboard that aligned with the pads on the watch and poked the wires through. NOTE polarity ! 

I then stripped about 20mm of the insulation from each wire, twisted the strands together and then rolled the twisted strands into balls that were just firm enough to press firmly against the pads but not to soft that they would crush and get loose.

Twist strands then roll into firm balls.

I connected the other end of the cable to a USB power bank and held the cardboard creation on the back of the watch.  Ripper , it worked the first time !

( no idea why Blogger wont let me flip the image ! )

I wasn't going to hold the thing in place for an hour or so. Thats what the wings on the side of the cardboard were for. Wrap them around the watch, secure with a rubber band and leave it for a while.

After a few minutes i heard a beep...um... it may have stopped charging... i cant see the screen. 

Easy fix , cut a bit off the wings.

This setup worked without a single problem or missed charge for the rest of the 2 week holiday. Packed and unpacked 4 or 5 times from my carry on.

 Hope it helps someone one day.

 HooRoo,