Little Monkey

www.littlemonkeycaving.co.uk

... ruder

monkey proofed

Rude Nora 4

Rude Nora 4 

Available to buy online from the Lil' Monkey web shop

 

Nora Batteries 

Nora battery boxes accommodate a range of batteries, including individual 18650 cells, non-proprietary battery packs, and just for good measure AA batteries. You are certainly not restricted to a single battery option as is typically the case, or expensive proprietary manufacturer packs.  

 

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. Our packs are professionally manufactured from high quality industrial cells, but can be readily constructed from 18650 cells if you know what you are doing. Knowing some fundamentals about li-ion battery packs will help you get the best from these.
 

Individual 18650 li-ion batteries fit in Nora box with a battery holder that uses two unprotected flat top cells, the cheapest and most consistently sized available.

 

Using a battery holder overcomes issues with flimsy battery contacts built into battery boxes, being more readily serviceable / replaceable, and also allows other batteries to be used including battery packs.     

Nora 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.  

 

Nora battery holder will accommodate 2 x unprotected 18650 batteries, typically 65mm x 18.5mm diameter, with some wiggle room.  

 

The batteries are arranged in parallel 3.7v (not series 7.4v), so will run happily on just 1 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. 

 

 

Nora battery packs and 18650 / AA battery holders extend above top of battery box to facilitate insertion / removal without difficulty, reducing risk of damage. There is plenty of room in Nora battery box to accommodate packs without losing the plot !

 

Connectors protected within battery box are by design, less prone to failure than external connectors on lamp cable when used in harsh environment, such as caving. 

Batteries should be orientated in two cell 18850 holder with both positive connections at one end, and both negative connections at other, as per markings on holder.

 

If batteries are connected incorrectly (specifically with the positive of one battery to the negative of the other) then you will create an effective battery short. This is beyond the scope of the protection circuitry, and should be avoided. If this does occur, then the likely outcome is that batteries will rapidly get hot and likely generate some smoke / smell. You will certainly notice your mistake, and you should disconnect the batteries from holder immediately. Chances are that one of the batteries will have been killed by this. On the up side, the internal resistance of the dead battery will go high, effectively acting as a fuse. Problem solved !!

The Nora AA alloy battery holder (3x 1.2v NiMh or 1.5v primary AA cells) is 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. 

 

Note - AA batteries do not offer the power density of li-ion, and can not support full lamp output, but still offer a useful option with good run times.