↑This is a cylindrical mobile battery from Elecom (Japanese electronics brand)
with waterproof performance—as long as the cap is closed,
it's even OK if submerged underwater.


On the end opposite the cap,
there's a tripod-standard screw hole,
but I couldn't think of what it was for.

「The tripod hole is actually a mounting base
for attaching an optional lantern unit
to the USB-A port.」
I received this comment.
Thank you so much!



When you open the cap, you see a USB-A female connector
and a USB-C port.
With the cap open,
there's no waterproof protection,
but with the cap sealed shut,
it handles any rain without issue,
so the peace of mind when carrying it is completely different.


These are Topeak pump mounting brackets.
There's a type that mounts straight onto the frame tube
without any lateral offset,
and they come in sizes for relatively thin pumps and thicker pumps
depending on the pump diameter
（there are more types than the two shown above），
and I'm using the thicker-size one


mounted to the bottle cage standard screw holes
on a Niner bolt-on style top tube bag
to serve as a mounting base for the mobile battery mentioned at the start.


The Colu cycle computer from SRAM
and the USE front light
can both be powered while in use.
Of course, that requires it not to be raining.

With the front lights I have,
the Supernova Airstream
can also be powered while in use,
but it seems this is related to the fact
that it supports powering from a dynamo hub.