The Raspberry Pi Zero battery has finally arrived, and was easy to attach underneath the Zero. I ordered a UPS Lite v 1.0 for Raspberry Pi Zero from Amazon Germany.
Including the cover, height is only 2.5 cm (+2 mm screw heads). The length is 7 cm, and the width is 4.4 cm (including the breakout GPIO HAT. The total weight is 63 grams. For comparison, my iPhone weights 285 grams. I will not longer bring the 200g power bank.
Next, I will wire up a couple of thyristors to the Pico GPIO and take them for a run.
Active Muscle Stimulator (Trask) 