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Old 03-27-2012, 01:14 AM #1
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Default 18650, power vs. duration? best cell?

Say I'm not concerned with length of use,
just raw voltage feeding my 532/445 lasers

What is the "best" cell to produce the highest mW from the laser?

either of these?
Panasonics
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18650 Batteries & Chargers

or ?
thanks in advance for recommendations



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Old 03-27-2012, 09:21 PM #2
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Default Re: 18650, power vs. duration? best cell?

Some chemistries will give you 0.15 more volts at fully charged conditions. I think samsung and sanyo make some of these. NCR18650a is a 4.2V cell. Great capacity, but you stated that you don't care for that, so don't pay extra for the highest capacity when you don't care about it.*
Other chemistries' cell voltage won't sag as much under heavy loads (IMR). These cells can withstand discharge currents of tens of amps.

*-ncr18650a has the highest capacity, but can only be discharged at 1lt, i.e. if 2900mAh cell, can only be discharged at 2.9A max, 3100mAh cell 3.1A discharge max.
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Old 03-28-2012, 06:56 AM #3
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Default Re: 18650, power vs. duration? best cell?

Quote:
Originally Posted by Tman View Post
Say I'm not concerned with length of use,
just raw voltage feeding my 532/445 lasers

What is the "best" cell to produce the highest mW from the laser?

or Samsung
18650 Batteries & Chargers

or ?
thanks in advance for recommendations
For the 532nm laser, you will need high current capability.
(I would use low a I.R. cell, like Panasonic 3400mah)

For the 445nm laser w/boost driver, you will need highest voltage capability.

The 4.35 VDC Samsung cell will give you the highest output.

Larry
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Last edited by LarryDFW; 07-06-2012 at 04:27 AM.
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Old 04-01-2012, 02:33 PM #4
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Default Re: 18650, power vs. duration? best cell?

Quote:
Originally Posted by LarryDFW View Post
For the 532nm laser, you will need high current capability.
(I would use low a I.R. cell, like Panasonic 2600mah)

For the 445nm laser w/boost driver, you will need highest voltage capability.

The 4.35 Samsung cell will give you the highest output.

Larry
Hey larry, do you sell 16340's too? And you have IMR AW cells?

Let me know!

(srry for the offtopic)

greeting,,
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Old 04-08-2012, 05:01 PM #5
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Default Re: 18650, power vs. duration? best cell?

offroad;

I have not found any name brand #16340 cells yet.

I have inquired with lots of vendors.

IMR cells are available, but a minimum order would probably be ~10 cells.

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Old 05-20-2012, 05:46 PM #6
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Default Re: 18650, power vs. duration? best cell?

So the green Pana's are "not" low IR, correct?
they'd be better for 445nm?

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Old 05-20-2012, 06:16 PM #7
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Default Re: 18650, power vs. duration? best cell?

Quote:
Originally Posted by Tman View Post
So the green Pana's are "not" low IR, correct?
they'd be better for 445nm?
I thought the NCR18650a's had low IR, isn't that what it's advertised for?
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Old 05-20-2012, 07:35 PM #8
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Default Re: 18650, power vs. duration? best cell?

Quote:
Originally Posted by LarryDFW View Post
For the 532nm laser, you will need high current capability.
(I would use low a I.R. cell, like Panasonic 2600mah)

For the 445nm laser w/boost driver, you will need highest voltage capability.

The 4.35 VDC Samsung cell will give you the highest output.

Larry
Larry

Will you need a new charger? my chargers output is 4.2v 500 Ma
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Old 05-21-2012, 07:03 AM #9
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Default Re: 18650, power vs. duration? best cell?

Quote:
Originally Posted by LittleGeenLaser View Post
Larry

Will you need a new charger? my chargers output is 4.2v 500 Ma
To charge to the full 4.35 VDC . . .

you will need a new charger.

I have a 1 amp 4.35 VDC charger for $17.95 each .

Samsung 3000ma 4.35 VDC cells are $11.95 each prepaid.

LarryDFW

P.S. Panasonic 3100mah cells are fairly low I.R. (about 90 milliohms)
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Old 05-25-2012, 07:12 AM #10
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Default Re: 18650, power vs. duration? best cell?

Quote:
Originally Posted by LarryDFW View Post
To charge to the full 4.35 VDC . . .

you will need a new charger.

I have a 1 amp 4.35 VDC charger for $17.95 each prepaid.

Samsung 3000ma 4.35 VDC cells are $11.95 each prepaid.

LarryDFW

P.S. Panasonic 3100mah cells are fairly low I.R. (about 90 milliohms)
The lowest internal resistance Panasonic are CGR18650CH.
I measured them at 54mΩ compared tp 97mΩ for NCR18650A
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Old 05-25-2012, 10:24 PM #11
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Default Re: 18650, power vs. duration? best cell?

Quote:
Originally Posted by Torchy View Post
The lowest internal resistance Panasonic are CGR18650CH.
I measured them at 54mΩ compared to 97mΩ for NCR18650A
Capacity of CGR18650CH is 2200mah

vs.

Capacity of NCR18650B is 3400mah,
and has "safety layer".

I measure DC Internal Resistance @ 55 milliOhms.

In some cases, the higher voltage 18650 cells will deliver more output with a boost driver.

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