Little Monkey Filthy Edna 2 User manual

www.littlemonkeycaving.co.uk
Filthy Edna 2 –Monkey Manual
ver.FE2.1.1 jrb2019

Edna2 Overview
Edna2 caving lamp has been designed for ‘wet caving’ including submersion (not diving).
Edna2 has one main LED, with semi focused flood LED. The lamp has 4 light settings (on the main LED).
It also has a separate moon mode LED (white smd LED) for maximum run time, and battery charge level
indication (smd LED blinks 1-5 times).
As standard, the Edna2 caving lamp operates from an individual unprotected 18650 battery. The battery
holder has electronic protection built in, but other arrangements including protected cells can be
accommodated (for further information see www.littlemonkeycaving.co.uk). Batteries can be removed from
battery box for charging in a proprietary 18650 battery charger, or can be charged using the Edna battery
holder in conjunction with our Nora micro USB charger (available separately).
Edna2 Operation
Edna2 is operated by the easy press sealed switch on the top rear of the lamp body. In normal operation, the
switch can be operated in two distinct ways, <short push> or a <long push> (push and hold).
The available light settings are in a continuous forward loop, 1 to 4, and off. Each of the settings can be
selected in turn, by pressing the switch <short push>.
The factory default light settings are;
1. low (70 lumen, 30 hours) - smaller cave passages
2. med (170 lumen, 10 hours) - general progression around cave
3. high (320 lumen, 5 hours) - progression in large passages
4. max (1000 lumen, 1 hours) - having a good look around !!
5. off (effectively zero battery consumption)
(max regulated light outputs,& approx. run times based on single 3400mAh 18650 battery)
In order to avoid cycling through subsequent light settings, Edna2 can be turned off from any setting with a
long switch press <long push>.
Note - when initially connected to the battery pack, Edna2 will turn on in moon mode (separate white SMD
LED). The next press of the switch (short or long) <push> will turn the lamp off, and the smd LED will indicate
battery charge level.
Edna2 has effectively zero battery consumption when switched off, so there is no particular requirement to
disconnect batteries. However it is always best practice to do so when not in use for more than a few days.
Moon Mode LED and Battery Charge Level Indicator
Moon mode is provided by a separate white smd LED, providing very low light (approx. 5 lumen) for ultimate
duration (200+ hours). Well suited to underground camp, expedition, small passage caving, and emergency.
Moon mode can be selected by a long switch press <long push> from lamp off setting.
The next press of the switch (short or long) <push> will turn the lamp back off. At this point the white smd
LED will display level of battery charge by blinking 1 to 5 times. 5 blinks indicates fully charged and 1 blink
very flat, for li-ion batteries. The light is visible underground, on the back of your hand, such that battery
condition can be determined without removing your helmet.

Edna2 Operation Flow Chart
www.littlemonkeycaving.co.uk
Connect Battery
Key
SP - Short Push
LP - Long Push
P - Push (Short or Long)
PP - 2 Pushes
Battery Charge Level
(smd LED 1-5 blinks)
4. Max
(1000 lumen, 1 hours)
Lamp Off
(effectively zero
battery drain)
3. High
(320 lumen, 5 hours)
1. Low
(70 lumen, 30 hours)
2. Medium
(170 lumen, 10 hours)
Moon Mode
(5 lumen, 200+ hours)
LP
P
SP
LP
SP
LP
SP
LP
SP
P

Low Battery Charge Level Indication
If battery charge is getting low, then Edna2 will automatically blink the main LEDs to indicate this, a few
seconds after a new setting has been selected. Following this brief warning, operation will continue as normal
with reducing light output as battery is now quite low, and the indicator LED will blink (not visible with helmet
on) at 1 second intervals. Edna2 has been configured to deliver a low light from fundamentally flat battery
packs for some time, therefore minimizing the risk of being left without light. However, at this point you might
consider using a lower light setting, or changing battery.
Ultimately, the Edna2 will restrict illumination to moon mode, and li-ion batteries will shut down at a set low
voltage level (typically around 2.7v) to prevent damage. In event of battery protection circuitry failure, Edna2
incorporates an additional layer of protection to ensure that batteries will not be over discharged
Thermal Management
While operating, Edna2 continually monitors lamp temperature. If lamp gets too hot then main LEDs will blink
and the power will be reduced to allow lamp to cool. White smd indicator LED will blink (not visible with helmet
on) at 1 second intervals while under thermal regulation. Lamp function is not locked, and simply changing
light setting will restore full operation, though be aware that unless a lower light setting is used for a few
minutes in order to provide time for the lamp to cool, then thermal management may quickly reactivate. In
reality, you are probably only likely to see this if running continuously for extended periods, using high settings
and in warm environments; as the Edna2 provides a very effective heat sink.
Edna2 Fitting Guidance
Edna2 is designed to be helmet mounted. Fitting is fairly intuitive. The standard alloy lamp bracket requires 3
holes drilled in the front of the helmet (4.5mm). When drilling, take care not to damage cradle etc, on inside of
helmet. The lamp bracket can be used as a template. Position of lamp bracket is personal preference, and
helmet type dependant. If possible, position lamp high enough to avoid interference with peripheral vision.
Orientate lamp and mark position of lamp bracket central fixing hole, drill helmet, and attach bracket to helmet.
M4 stainless steel hex screws & lock nuts are provided for this. Mark other 2 bracket holes, twist bracket to
one side (or remove completely) and drill helmet. When fixing bracket to helmet, nuts should be on the
outside. The extending arms of the alloy lamp bracket will need to be adjusted to suit lamp and accommodate
curved helmet profile. They can be bent carefully by hand as required.
The Edna2 battery box can be attached with shock cord (suggested 4mm) or two cable ties. This will require
up to 4 suitably positioned holes drilled in helmet, depending on preferred fixing method and helmet design..
The lamp can now be fitted to the lamp bracket. Nora has been designed for cable to run inside the helmet, ,
though many arrangements are possible. The lamp housing and cable can typically be threaded under the
rim of the helmet, behind the cradle inside the helmet and back and out at the front of the helmet, though
many arrangements are possible
The lamp is fitted to the bracket with 2 off M5 cap head screws. The M5 stainless spring washers fit between
the screw heads and the bracket, the M5 stainless washers fit between the bracket and the lamp body.
Orientate lamp to desired angle and lock up both screws, using 4mm allen key. To maintain good water
integrity, high viscosity silicone grease can be used on battery box O ring and front window O ring.
The battery box is opened at the opposite end to the cable gland. Battery and lamp connectors are polarized
so correct polarity is ensured. Battery connections should be made outside of the box, and battery pack
orientated in battery box, with wires and connectors typically orientated down inside wall of box (opposite side
to cable entry). Take reasonable care when fitting battery in order that wires do not get trapped / damaged,
and individual batteries are orientated correctly in Nora battery holders. The battery holder has li-ion protection
circuitry. Take care not to damage this. The cable gland end of the battery holder can be opened for service /
maintenance purposes.

The Modification of Helmets for Caving
By necessity helmets have to be modified in order that they can effectively be used for caving or adapted to
suit the requirements of a particular task within the caving environment. Invariably holes will need to be drilled
in the shell so that lamp brackets or reserve lamps can be fitted. Cavers drill helmets; as they principally use
these to mount lamps and protect from light bumps.
If holes are drilled in sensible positions and kept to a minimum they are unlikely to have an adverse effect on
the overall strength or protection offered by the helmet shell, but obviously this can't be guaranteed. Drilling
holes into a helmet shell technically invalidates its certification as Personal Protective Equipment (PPE) and
may have an adverse effect on the amount of protection provided by it, so anyone who modifies or uses a
modified helmet must be aware of, and fully accept, the potential incurred risks of the modification beforehand
and during subsequent use.
Li-ion Batteries
Knowing some fundamentals li-ion batteries will help to ensure that you maximise the life of your cells. While
li-ion batteries are fairly robust, they are potentially susceptible to damage particularly from severe impact,
temperature and water ingression. Our lamps have been designed to best protect the battery, while
maintaining a practical helmet mounted solution for underground use. If carrying spare batteries, take care to
avoid severe impact and water as they will potentially break. A hard case waterproof container is probably
advisable.
We do not take responsibility for injury to persons or damage to property from cells or chargers. These should
be used and charged under supervision, stored safely, appropriately maintained and correctly disposed of if
there is any suspicion that they have been damaged or are defective.
Battery Charging
Although the charging algorithm for li-ion cells is relatively complex, this is typically sorted out by the charger
and battery protection circuitry. Consequently, chargers are invariably simple plug in and go solutions. Red
light charging, green light fully charged, with automatic charging shut off. Li-ion batteries can be part
discharged or part charged without consequence. There is fundamentally no rapid high current charge option
for li-ion cells (though they will reach 80% charge fairly quickly). Although charging is automatically shut off on
completion, it is always advisable to disconnect battery packs from chargers when charging has finished.
Battery Storage
The capacity of li-ion batteries is reduced with age. The chemical process that relates to this is accelerated
with increased temperature and charge level. To realise maximum battery life, cell packs should be stored
around half charge and in a cool and dry environment (around 15 degC, do not freeze). Under no
circumstances should battery packs be left discharged for an extended period, in order to avoid self discharge
below 2.5v and permanent damage.
Battery Compatibility
Edna2 operates from 3.7v li-ion, and is not compatible with high voltage li-ion battery arrangements, typically
ranging from 7.4v to 14.8v, connection to which could result in damage. Always ensure correct battery
polarity, to avoid potential damage to lamp.

Li-ion Battery Summary
Avoid getting batteries wet
Avoid severe impact. Do not puncture.
Store batteries somewhere cool, around 15 degrees C
Store batteries part charged, around 50% is good
Do not store batteries discharged (as deep self discharge will kill them)
Do not store batteries connected to lamp
Use a Little Monkey charger, or a suitable equivalent
Keep a watch on general battery condition (avoid damage to leads and connector)
Do not use or charge a potentially damaged battery
Dispose of dead battery packs at suitable recycling facility
Do not short circuit or reverse polarity batteries
Keep away from children and monkeys
High Power LEDs
Edna2 lamps use high power LEDs which are fairly bright! Do not look at LEDs in operation. Eye injury can
result. Be especially careful of this when programming light settings. Do not shine you light into other people’s
eyes, particularly at close range. For more information, see Cree website.
Warranty
Edna2 has a standard 1 year warranty against defects in material and manufacture. If your product or
accessories fails to operate to specification during the Warranty period we will arrange for your product to be
repaired or at our discretion replaced. This warranty is subject to reasonable wear and tear (in our opinion)
and correct use and maintenance of the product as applicable. We will not provide warranty repair /
replacement if the problem, in our opinion, resulted from use outside the product specification, modifications
or alterations, incorrect connection, operation or fitting where applicable, external damage due to accident,
impact/ abrasion, poor storage, poor maintenance, use of non approved parts, wear and tear parts (e.g. front
window). We will always endeavour to keep any costs due to damage to an absolute minimum.
Edna2 has been designed for ‘wet caving’ including submersion (not diving), operating effectively in a hostile
environment, i.e. caves, and be as robust / reliable / practical as possible for this purpose. As a consequence
it will get battered and while we appreciate that it is entirely feasible to break things occasionally, any such
damage is beyond the scope of the product warranty. Expect to pay for any damage related repairs. We
advise against pressure washing or rough submerged washing where it could be possible to force moisture
past the switch seal. If water, even the smallest amount is forced in to the lamp, you will note condensation
behind front window when lamp is operated. If you notice this, then remove front window (with hex key
provided) and run on a medium setting to warm lamp and burn off moisture, before reassembling.

Disclaimer
Caving is not without risks. We would not presume to tell you how to kit up and use your equipment. What we
will say is that the Edna2 is not, and should not be considered as, Personal Protective Equipment (PPE). How
you interpret any guidance that we give on the use of our products and how you use our equipment is entirely
at your own risk. Caving is a rigorous activity that is harsh on equipment. Edna2 has been designed to be
safe, robust and best withstand the demands of caving, while remaining practical as a tool for this purpose.
This does not mean that it cannot be broken. Lights can fail without warning, and we take no responsibility for
any consequence of this. Always carry a reliable and accessible independent backup light source for any light
crucial activity / function. Good caving practice is your own responsibility. We do not take responsibility for any
accident, injury, liability or cost, to yourself or that you may cause to anyone else, or to any property. This
applies to caving or any other function for which you choose to use and place reliance upon our product. We
are aware that our lights are often used for cave diving. Information relating to the scope of this activity will be
published on the little monkey website.
Please note that you personally assume full responsibility for the risk of property damage, bodily injury or
death which may occur from the use of this product in any manor whatsoever. If you are not able, or not in a
position to, assume this responsibility, or take the risk, then do not use this product. We are not responsible
for the consequences (direct, indirect or accidental) or any other type of damage befalling or resulting from the
use of this product. If you are not entirely comfortable with the above, then do not purchase or use any of our
products.
About Us
Edna is designed and manufactured by us, trading as Customduo. We are based in Cheddar, in the Mendip
Hills, a significant UK caving region. To contact us or view latest version of Edna2 manual, product guidance
and terms & conditions, please visit website www.littlemonkeycaving.co.uk