External or internal battery?
External
Edit: thou I do have a spare internal battery I could use temporarily if that's easier
In that case, assuming you're using an old style Junction A, you'll need an SM-PCE1 adaptor. And a Windows computer with a USB port.
@damitamit started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
External or internal battery?