LR1/E90 "N"

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Cliffdenyer
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LR1/E90 "N"

Thinking of converting a sipik68 clone from a single Aa to 2x N cells, would the extra voltage (1.5 to 3v) make the light much brighter? Should only need to shorten/remove the tail spring to fit. Try to keep it alkaline as it will most likely be a gift for a non flashaholic friend. Let me know your thoughts…….

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Edited by: Cliffdenyer on 12/29/2016 - 17:56
Cliffdenyer
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Anybody tried this or got any thoughts??? Also noticed NiMh N cells for sale might try with these too…….

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LightRider
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Is there a reason you wouldn’t want to just use 3.7v lithium ion 14500 battery. You would get greater capacity and the light should be about 2x as bright

Cliffdenyer
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Yes Lightrider,it will probably end up as a gift for a non flashaholic friend. I have many lithium lights just thought I’d try something different. Would it not be 2x as bright with 2x alkalines up from 1?

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dw911
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My thoughts are regards the N type battery idea, they are not always easy to get hold of and are very expensive here in the UK , ( £3.99 each ) at argos, that’s a lot of AA batteries or a very good torch after a couple of N Cell battery changes

wle
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N cells are very expensive and weak…

"You never have the wind with you - it's either against you, or you're having a good day."
    Daniel Behrman, "The Man Who Loved Bicycles".
It never gets easy, you just go faster.   
-Greg Lemond.
       ,ø¤º°`°º¤ø¸,ø¤º°`°º¤ø¸,ø¤º°`°º¤ø¸

Jerommel
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Since the SK68 usually has rather wide inside tube, you could put 2x CR2 in series, but you’ll smoke the driver and / or the LED.
…unless you put an XHP50 in it and skip the driver. Big Smile

Barkuti
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And you could also fit these inside:

Now, please bear in mind that, since SK68s use very simple boost drivers (to handle Ni-CDs/Ni-MHs/alkaleaks), not even with all my expertise do I find advisable to use unprotected li-ions on these crappy flashlights.

Thus, better install a protection PCB on these li-ion batteries meant to be used with SK68s and other multi-chemistry boost driver crappy torches.

Have a nice day. Smile

 

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Angler
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Cliffdenyer wrote:
would the extra voltage (1.5 to 3v) make the light much brighter?

The Led is already receiving 3v.
The driver is boosting the 1.5v up to 3v in order
to meet the forward voltage requirement of the led.

If the led was receiving 1.5v it would not light up at all.

Barkuti
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Angler wrote:

The driver is boosting the 1.5v up to 3v in order
to meet the forward voltage requirement of the led.

The feat those boost drivers have to accomplish is quite a bit finickier. Because of the actual battery load voltages (IR dependant) plus other component induced voltage drops (springs, etc), their operative voltage range window needs to go waay lower.

A couple of self-explanatory captures borrowed from HKJ's battery comparator:

Left, red: Ni-MHs. Right, blue: alkaleaks.

 

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Cliffdenyer
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I can get “N” cells for £2 at my local sainsburys that’s what got me thinking. Can any anyone confirm if 2x cr2’s fit this light? Next question do NiMh cr2’s exist? Are lithium manganese primary’s available in the Uk?Thanks everyone for you help trying to avoid lithium rechargeables with this one.

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Cliffdenyer
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Tried the light with 2 NiMh and a piece of wire and it was twice as bright as with one cell, so now I’d like to know if 1/2aa or cr2 NiMh cells exist anyone know?

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dw911
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Cliffdenyer wrote:
Tried the light with 2 NiMh and a piece of wire and it was twice as bright as with one cell, so now I’d like to know if 1/2aa or cr2 NiMh cells exist anyone know?

How long did you run it for, sometimes the magic smoke doesn’t come out straight away Wink

Found these, so they are available

http://ogazent.com/cscart/n-cell-500mah-nimh-rechargeable-1.2v-battery-n...

https://www.amazon.com/1-2V-500MAH-NIMH-N-CELL/dp/B00G9BLR9C

Cliffdenyer
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As far as I have read these lights can run on 14500s so two NiMh should be fine? Also just found these will join to make a 2.4v aa to use in this light, thanks everyone for your input. I will report back with the results when I receive the batteries….

http://m.ebay.co.uk/itm/1-2AA-Battery-Ni-Mh-1-2V-600mAh-/361854445007?na...

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Cliffdenyer
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If it works well could be a good substitute for those who don’t like like lithiums for 14500 lights.

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Jerommel
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Hey, nice find!

Jerommel
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I see there are 1/3 AA NiMH cells too.

Jerommel
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Cliffdenyer
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Nice find that could be good, might see if there’s a Uk supplier of those too.

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Cliffdenyer
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Just ordered 2 of these won’t last long but I will use them in rotation should be ok and will be very bright. Thanks for the find Jerommel.

http://m.ebay.co.uk/itm/400688068178?_trkparms=aid=222007&algo=SIC.MBE&a...

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Cliffdenyer
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Will post white wall shots with a single Aa NiMh and the 3.6v 1/3 NiMh pack when they arrive.

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Some notes about that 3S Ni-MH on an SK-68, Cliffdenyer:

With 3.6+V at the driver's input of a 3-mode SK68 I have lying around disassembled, I could measure ≈1.2A tailcap current in high mode. That's a 2.5C discharge rate for a 480mAh battery, equivalent to a 5A discharge rate for a 2000mAh Ni-MH. Now, if those batteries were real 480mAh Ni-MH's with low internal resistance, that could be acceptable in the hands of a tech knowledgeable user who would willingly turn-off the flashlight as soon as he notices a drop in output. However:

That “Flash AA” is an off-brand battery which barely tested close to 1400mAh at low discharge rate. I want to illustrate this to make this supposition: your “480mAh” cells battery is really more like 350mAh. Take a look at that “Flash AA” 5A discharge curve then, and think about it; also, bear in mind the SK68's boost driver won't cut the crap until all the way down to sub volt levels…

You said you want to give that out to muggles? Facepalm

The soothsayer sees a disaster down the road, and no need for a crystal ball (reverse polarized cells!)… 

BAD IDEA is my rating. 

 

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Jerommel
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I think i agree, Barkuti..
But i also think they’re cute little batteries. Smile

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My driver is Five mode so it’s different to yours, maybe Il keep this one for a while and test the batteries out and get another for gifting.

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itsme5k
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Oh wow I didn’t realise there 1/2 and 1/3 AA sized cells existed!

Have a few uses for these…

Thanks for the info. Smile

- John

Watch this space...

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Barkuti do think it would be better to use 2× 600mah 1/2 aa NiMh for the gift light? I will keep the 450mah 1/3 aa’s for myself.

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