Rude Nora 4
Available to buy online from the Lil' Monkey web shop
Nora battery boxes accommodate a range of batteries, including simple non-proprietary 1s1p 3.7v li-ion battery packs, individual 18650 cells and for good measure AA batteries.
You are certainly not restricted to a single battery option or expensive proprietary manufacturer packs, as is typically the case. It is simple to switch between various battery solutions, using well proven rc connectors protected within the battery box.
Nora battery packs are a simple 1s2p side by side 3.7v arrangement, with robust rc connector, and protection circuitry. No fanciful proprietary arrangements to tie you to Nora cell packs.
Lil' Monkey battery packs are manufactured from high quality industrial cells, or can be readily constructed from 18650 cells if you know what you are doing. Knowing some fundamentals about li-ion batteries will help you get the best from these.
Nora 18650 battery holder has on board protection circuitry, for short circuit, over discharge and over charge. Importantly, this keeps the battery protection as close as possible to the cells and simple to replace should it ever fail.
Note, short circuit protection protect against short in lamp or cable. It does not protect against loading batteries incorrectly into holder. Battery polarity as marked on holder must be strictly observed. Failure to do so could cause short circuit and damage to batteries and holder.
Nora 18650 battery holder will accommodate 2 x unprotected cells, typically 65mm x 18.5mm diameter, with some wiggle room.
The batteries are arranged in parallel 3.7v, so will run happily on just one battery if required. This also has the distinct advantage that if one battery contact should ever misbehave then lamp will not cut out.
Nora battery holder can be used as a charging vehicle in conjunction with our Nora USB or Nora micro USB chargers. Micro USB charger pictured, can be connected to any suitable phone charger, USB sockets (with suitable USB to micro USB cable), to mains (with mains to USB adapter) or 12v car socket (also with suitable USB adapter). Snoopy loop optional !!
Alternatively, batteries can be removed and placed in any suitable 18650 li-ion charger.
Simple non-proprietary, relatively low cost, 3.7v 7000mAh 1s1p 18650 battery packs. Battery packs remain the least fussy, easiest to manage solution for most cavers.
2 cell arrangement minimises helmet weight and provides plenty of capacity for well skilled caver to easily cope with 24+ hour underground trip. Spare capacity is of course better carried elsewhere, not on your head, for the longest of trips. For such trips you would need to carry extra capacity if you had 3 or 4 cells on back of helmet too, so the weight (and cost) penalty just keeps stacking up. Larger battery packs makes little sense with advances in LED and battery tech.
Note how the batteries protrude from the open Nora 4 box and have plenty of clearance around them, making them easy to remove for charging, or of course swapping out on those super long multi day underground trips.
Connectors protected within well designed battery box are less prone to failure than external connectors on lamp cable, when used in harsh environment such as caving.
Individual 18650 batteries!! Nora 4 battery box uses a removable battery holder accommodating 2off unprotected 18650 batteries. Using a removable holder allows different battery solutions to be mixed, such as the standard Nora 1s2p battery packs.
This also means that holder can be easily removed and replaced if damaged! Coil spring contacts build in to battery boxes are historically troublesome. Easily removable holder avoids this problematic point of failure.
Nora AA battery holder (3x 1.2v NiMh or 1.5v primary AA cells), a handy option for expedition or reserve! Well suited to expedition use where taking a sack load of AA batteries might on occasion offer most practical solution, or if your li-ion batteries / packs have been confiscated by overly officious airport staff (it has happened). Or possibly just as a handy reserve battery.
It should be noted that AA batteries will not provide sufficient power density to deliver full ouput from lamp, but is a very useful option offering lamp good run times.
We would advice having a spare battery holder available in case of damage or failure. Additional / spare 18650 battery holders are available in Lil' Monkey web shop, see Lamp Accessories