Product idea: Wearable Smart Watch charge pack

[paulca]

I hate charging my smart watch.  I hate taking my watch off at all.  I can attach the magnetic charge lead to the watch while I wear it, but unless I am really on the ball I have a tendency to walk off while cabled, taking the powerbank or the whole USB hub with me.

I thought as a PoC it would be very easy to take a small power bank, a much shortened charge lead and just wear the power bank on my arm.

So that led to... if I used very thin PCB to mount the magnets and pogo pins, then used a bit of flexi-pcb to get out from under the watch and a small 200mAh lithium cell + smd boost converter to make 5V.

When I wondered, why does nobody make this, the answer is obvious.  Every damn watch has a different damn connector.

So.  Why can't the end of that "ribbon PCB" now just be contacts which are inserted into <your phones charge adapter>

I figure, as most watches are only like 100mAh or less, that a similar sized (or half the size) pouch cell could be supported by the watch itself, maybe 2 plastic rods to stop it flapping around.

So, the lithium cell + boost converter in a nice little case, a ribbon connector/flexiPCB under the watch with a couple of tiny plastic or aluminium rods for rigitity and ... one of a selection of end connector modules for your watch docking port.

In case I am missing anyone.  You put the device under your watch, it snaps to the docking connector and charges the watch.  No leads tying you down.  When the watch is charged (an hour or two), just take the device off and put it on charge.

It's academic, or free for exploitation as I have no interest in developing such a product.  I'm probably going to settle for the smaller power bank I can find and a watch strap.