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Old 07-07-2012, 08:09 PM #1
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Cool 5W laser from a 18650 battery? Can it be true?

What do you think about this? O-like selling them, so I am quite confused, they have good reputation here

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Old 07-07-2012, 08:14 PM #2
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Default Re: 5W laser from a 18650 battery? Can it be true?

The laser seems legit. 5Watt IR lasers do exist but the the beam and dot isn't visible. It is a pure burner.
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Old 07-07-2012, 08:20 PM #3
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Default Re: 5W laser from a 18650 battery? Can it be true?

Surely. However for that price it would be better to mention what diode amperage is and what is its efficiency. Without these, we can only speculate, or rely on some purchaser's review.
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Old 07-07-2012, 08:26 PM #4
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Default Re: 5W laser from a 18650 battery? Can it be true?

You can buy it and test it for us

I don't know what efficiency has to do with 5Watt laser. It is more useful with green lasers.
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Old 07-07-2012, 08:27 PM #5
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Default Re: 5W laser from a 18650 battery? Can it be true?

Its an IR laser. You must be very careful with them, as you cant easily see the beam or dot. Your eyes arent sensitive enough to that wavelength of light and so it doesnt seem that bright, this also means your blink reflex wont function properly...

If you mess up with 5 W of IR a retina could easily be toast...

Edit: I dont get the "Safe" bit in their description
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Old 07-07-2012, 09:17 PM #6
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Default Re: 5W laser from a 18650 battery? Can it be true?

I meant diode efficiency, sorry for confusion. You know, knowing the diode amperage & percentage efficiency would enable us to calculate real power

About safety -well, laser is as safe as a gun. The only unsafe element is human being, and from him depends if he use it properly.

But going back again with that battery supplied, I suppose it wouldn't burn long? Any way to estimate its power-on-battery time? (not duty cycle)

Last edited by btc5; 07-07-2012 at 09:20 PM.
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Old 07-07-2012, 09:42 PM #7
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Default Re: 5W laser from a 18650 battery? Can it be true?

Quote:
Originally Posted by btc5 View Post
I meant diode efficiency, sorry for confusion. You know, knowing the diode amperage & percentage efficiency would enable us to calculate real power

About safety -well, laser is as safe as a gun. The only unsafe element is human being, and from him depends if he use it properly.

But going back again with that battery supplied, I suppose it wouldn't burn long? Any way to estimate its power-on-battery time? (not duty cycle)
A while ago I built a >2W 808nm laser. It was powered by 1 18650 running at 2.8A and ~2.2V on 8 AMC7135 regulators in parallel. It produced a lot of heat and drained the battery quickly. I would estimate ~15 minutes.

A 5W diode needs >5A and 2.2V. Can an 18650 supply 11W of power to this diode?
And the host will need to move >6W of heat.
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Old 07-07-2012, 10:59 PM #8
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Default Re: 5W laser from a 18650 battery? Can it be true?

They run by 26650 Cell! Where you saw 18650?
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Old 07-07-2012, 11:32 PM #9
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Default Re: 5W laser from a 18650 battery? Can it be true?

Quote:
Originally Posted by eytyxhs View Post
They run by 26650 Cell! Where you saw 18650?
Where do read about the 26650 cell?

The description clearly says 1x 18650

Ok, I see, there is a 26650 cell in one of the pictures.
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Old 07-08-2012, 01:55 AM #10
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Default Re: 5W laser from a 18650 battery? Can it be true?

Quote:
Originally Posted by eytyxhs View Post
They run by 26650 Cell! Where you saw 18650?

Quote:
Specification :
(1) High Power 5W IR laser pointer
(2) Wavelength: 808nm
(3) Battery: 1 X18650
(4) Dimension :40x 228mm
(5) Output power: >4.0W
(6) Transverse Mode: TEMoo
(7) Switch: Constant on/off button
(8) Expected Lifetime: > 8,000 hours
(9) Body Material: Brass
Says 18650.
So which is it?

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Old 07-08-2012, 01:58 AM #11
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Default Re: 5W laser from a 18650 battery? Can it be true?

Looks like a 22650 from the scale of the picture.
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Old 07-08-2012, 02:04 AM #12
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Default Re: 5W laser from a 18650 battery? Can it be true?

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Originally Posted by ARGLaser View Post
Looks like a 22650 from the scale of the picture.
Well, yes... but what battery is the laser supposed to operate on?
I don't think a single 18650 can do the job so it must be 26650.

I don't have experience using 26650 batteries so I can't say how well it would hold up with a diode that needs 11W plus losses in the driver.
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Old 07-08-2012, 03:32 AM #13
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Default Re: 5W laser from a 18650 battery? Can it be true?

If you look at the battery cell . . .

it is a 26650 IMR cell which can easily deliver 6 amps.

A switching buck driver could run on a #18650 @ ~3 amps.

I have also drawn 6 amps from 3400mah 18650 cells.

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