While planning to build a DIY bike light,
I looked into purchasing a battery pack.
These were comparatively expensive compared
to the individual 18650 Lithium Ion cells
I was using in my MTE P7 torch, so I started
to look around for holders to take these
in the same way that AA and C cells can
After I drew a blank on commercially available
holders, I started investigating how I
would make one of my own.
With lots of feedback from various forums,
specifically mountain biking ones, the holder
progressed from the simple and basic concept
on the left to the slightly more polished
article on the right
Various forums suggested that it would be
a nice idea to produce a replacement battery
tube to screw into the MTE P7 torch. While
this was an interesting concept which
I developed into a prototype, the internal
dimensions of the P7 seemed to change from batch
to batch, so it wasn't feasible to produce
a universal adaptor. While this is charted in the
progress page, it has not developed into a
fully fledged product.
I now have fully working holders which take 18650 cells, which are available in various
I also have neoprene pouches suitable for mounting the battery holder to a bicycle
or simply protecting them in a pocket or back-pack.