Rude Nora and Filthy Edna
Available to buy online from the Lil' Monkey web shop
The Edna battery box accomodates a single unprotected 18650 flat top 3.7v li-ion battery and / or simple low cost 1S1P 3.7v li-ion battery packs.
18650 batteries are now widely available to the regular consumer, and Lil' Monkey 18650 packs are simple 3.7v arrangements, so the customer need not be tied to expensive proprietary lamp manufacutrer battery packs.
The Edna battery box can be attached to back of helmet with suitable shock cord, or zip ties etc, according to user preference. A flexible, impact tolerant approach, widely used by cavers for mounting battery boxes and battery packs on helmets!
The individual 18650 battery is fitted into Edna box in a battery holder, for reliable connectivity and maintainability. Essential electronic protection for li-ion batteries is incorporated in the Edna battery holder. Additional protection is incorporated in the lamp electronics and battery management software.
Additional / spare Edna battery holders are available in Lil' Monkey web shop, see Lamp Accessories
Unprotected 18650 cells are more consistent in size than protected cells, more cost effective, more readily available, and more likely to be legitimate !! The best 18650 cells are currently available in capacities up to 3500mAh.
The Edna battery holder can be used as a charging cradle for the 18650 battery, in conjunction with our Nora USB or Nora micro USB li-ion chargers. These chargers can equally be used to charge a 3.7v li-ion Edna battery pack.
Edna 1S1P 3.7v li-ion battery packs use an individual NCR18650 3500mAh cell, with battery protection circuitry and RC connector. This is a simple widely available format, or can be easily constructed.
For further essential guidance, including battery and cable management, and li-ion battery charging options, see Edna Batteries
The Edna battery box is constructed from aluminium and weighs 75g without battery. It has a screw on lid at the opposite end to the lamp cable exit. The lid has an O ring for a water tight seal. A spare O ring is supplied with the lamp, and these are also available in the Lil' Monkey Lamp Spares shop.