My lights have done two full years' commuting and a few longer rides. Unfortunately, they have slowly degraded and this morning the flex went just where it comes out of the battery case.
Well, figuring that I could do no harm other than possibly ignite the whole block in a crescendo of fiery li-pol death, I used a fine cutting disc to crack open the seam of the battery and get inside. Chopped the wires clean at the broken section, soldered together, wrapped in duct tape, and bob's your uncle!
OK, I had just sawn the battery case in half, so required a liberal application of duct tape to seal... but half an hour's work, no fiery death, and saved myself £40.75 + shipping on a replacement!
What a win. Goes to show you shouldn't believe everything it says on the tin (like 'DO NOT DISMANTLE'!) ;-)
Unfortunately I'm concerned this un-breakage may have damaged my top-trumps AWESOME POWER rating?