Rude Nora and Filthy Edna
Available to buy online from the Lil' Monkey web shop
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Edna battery box, the way forward !!!
The Edna battery box can accommodate 1 x 18650 li-ion battery (unprotected). Low cost and widely available.
Battery weight is on the back of the helmet, where it needs to be, and 1 cell means that battery weight on head is minimised. LED caving lights no longer need massive 4 cell battery packs to achieve lots of light for lots of time.
I personally have a knackered neck thanks to years of using heavy helmet battery packs.
For those of you of a technical persuasion. Custom designed Nora 4 (nor4) light engine, care of our gifted electronics bod. Featuring pair of advanced 'dual range' LED drivers providing enhanced fine current control over the wide range of outputs demanded by highest specification caving light. Stable light output, equally as effective at both high and very low outputs.