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Battery for high Lumen LED Torch
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#1 (permalink)      3/12/2017 6:07:26 PM US Central   quote/reply + tips
El_Echad
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Battery for high Lumen LED Torch
Are these batteries suitable to use with my high power head strap LED torch and other high lumen led torches around 5000lm?
Please advice if this is not suitable what is suitable? I am curently using my vape pen 18650 battery Samsung 25R and I rather get something suitable for the LED Torch if it doesn't require 20A.
#2 (permalink)      3/12/2017 6:14:51 PM US Central   quote/reply + tips
wuwei.ap
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What's the current draw of the flashlight?
#3 (permalink)      3/12/2017 11:33:15 PM US Central   quote/reply + tips
El_Echad
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It's a generic flashlight. I have to email the seller to find out. It's using XML LED.
What is the current draw on this battery? Is it truely rated at 3400mA/hr?
#4 (permalink)      3/13/2017 12:49:03 AM US Central   quote/reply + tips
wuwei.ap
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That's the capacity mA/h.

You can find more info here and the data sheet of the battery here:

If you read carefully this PDF document from Panasonic, you will see that typical capacity is 3350mAh, and 2 C (bottom right - battery discharge characteristics graph).

2 x 3350 = 6700mA

In Amps (Ampere) : 6.7 Amp - much easier number to read.

Maximum NCR18650B discharge amp limit is 6.7 Amps under continuous current load.



http://www.batteries18650.com/2015/05/Panasonic-NCR18650B-3400mah-limit-datasheet-li-ion-18650-battery.html

#5 (permalink)      3/13/2017 2:16:21 AM US Central   quote/reply + tips
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Sossij
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I would think the most your flashlight will take is 2.8 amps. If it's a generic knockoff with a fake Cree it's likely to be nearer one amp. I think these batteries will be fine :)
"You quit cigarettes, you started vaping, and now you're Einstein"
#6 (permalink)      3/13/2017 3:36:49 AM US Central   quote/reply + tips
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Sossij
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Thinking about it, an XM-L will produce about 1000lm with taking around 3 amps. That would suggest that your '5000lm' light is using 5 XMLs and taking 15 amps, in which case these batteries are going to struggle at 7.5 amps each.

I'm a little dubious about that 5000lm rating though. I wonder if it's only got 3 LEDs and is realistically only about 2500lm, which to me sounds about right. Ancient Chinese proverb say "Chinese Lumen Is Twice Normal Lumen" ;)

Oh, you probably know already, but make sure you get button-top batteries if they are necessary. I'm guessing this light has a separate battery pack, so it probably doesn't matter though.
"You quit cigarettes, you started vaping, and now you're Einstein"
#7 (permalink)      3/14/2017 7:15:47 PM US Central   quote/reply + tips
El_Echad
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These are the head torch I bought.
It say it's 5000lm using XML LED but I hightly doubt it's 5000lm cos it only has 1 LED chip.
This is is the torch from ebay.
http://www.ebay.com.au/itm/5000LM-Zoom-XML-T6-LED-18650-Headlamp-Torch-Headlight-Rechargeable-Head-Lamp-BA-/391557796383?hash=item5b2aa9d21f:g:-LcAAOSw3YNXbPl-

it got the battery pack you put the battery in at the head strap at the back of the head.
#8 (permalink)      3/14/2017 7:36:30 PM US Central   quote/reply + tips
airbagz
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It's an $8.00 generic zoom light. It will probably be about 4750 lm short of 5000.

The Panasonics should give good runtimes, but you might need button tops.
I just need one more flashlight. Just one. Honestly. :D
#9 (permalink)      3/14/2017 7:45:27 PM US Central   quote/reply + tips
El_Echad
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What's a button top. Sorry I don't know much about batteries.
Currently I'm using my Samsung 25R x2 on this torch but I don't want to ruin those batteries from charge and discharges because I use them with my Kengartech Top tank mini
#10 (permalink)      3/14/2017 8:15:43 PM US Central   quote/reply + tips
airbagz
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The + end of the battery protrudes a few mm, but if the Samsungs work, than you don't need button tops.
I just need one more flashlight. Just one. Honestly. :D
#11 (permalink)      3/14/2017 8:47:54 PM US Central   quote/reply + tips
wuwei.ap
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It says that the working voltage is 3.7V, so I assume it's a parallel battery arrangement. The XML T6 is pretty bright. I'd be careful using that on high for long periods because it creates a lot of heat and it doesn't look like it has much material to dissipate it.

You can find the NCR18650B with protection PCBs here. The problem I had with my T6 was heat. The wire insulation melted when I had it on high for a long time and caused a short. With protected batteries you won't have an issue like that.

Think safety first.