DIY hidden battery for lights

I've had those AXA lights for a while now and finally made rechargable power unit for them. It's somewhat shoddy but it will do.

Ingredients include some cheap powerbank internals, 5Ah 3,7V 21700 li-ion, combined TP4056 charger and dc-dc boost. switched output for front and rear light, usbc for charging. 3d printed steerer plug and washers.

DC-DC converter is idling at about 2.5mA, a somewhat acceptable compromise without adding things. Charging set to 1A; should roughly take 6 hours. Output adjusted to 12V delivers <0.45A. I forgot to measure how much the lights draw, but it shouldnt be more than 3W.

Now onto some real life tests.