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LaserSam & jmgallego; The review button is nice for checking the maximum current setting. I have used it for several years, and it has no voltage spikes to take out laser diodes, like the MasTech. I can sell it for $215. PM if you need one. Thanks; LarryDFW

I have used a Mastech, but this Extech is a much better supply: The 4 Digit readout allows plotting diodes with better precision. Here I am charging the newest lithium ion #18650's to 4.35 VDC in Constant Current mode. The 5 amp capacity allows charging several cells at once. Also switching...

This is the reason enthusiasts should buy quality #18650 cells. Panasonic has actual 3400mah cells in #18650 size. Much greater capacity, lower internal resistance and UL 1642 safety testing . . . gives you higher current, and longer run times. (and shorter charge times) Larry

IF they are quality battery cells . . . you can solder a positive pole on them. Takes up less space than some of the add-on metal pieces used. Photos of Positive Terminal Modified LarryDFW

Blaster; The Panasonic cells are probably delivering considerably more current to your laser than the "protected" cells. Driver may be overheating, and shutting down. Try a Panasonic that only has about half capacity left. That should be "equivalent" to your other cells. LarryDFW

Update on International shipping: An inexpensive circuit will be required to ship them internationally. I have found some very inexpensive equipment to ship the cells in. I think two cells will ship for $8, in an inexpensive circuit holder. Three/Four cells will ship for $11, in an...

Zeebit; Two things could be responsible for the low current: 1. LED requires higher voltage than normal. 2. Battery voltage is sagging under load (more likely). Check the voltage on LED when lit. LarryDFW

Big; Those Panasonic cells will insure the maximum power from your laser. Low Internal Resistance means more voltage delivered to drive the laser. LarryDFW

I got another shipment of Panny cells today, if you still need some more cells with positive buttons. Thanks; LarryDFW

I would expect the copper heat sink to work better. Your 300ma @ ~3 VDC is 900 mw. I would suggest a max of 600 mw (200ma) LarryDFW

There are several 18650 cells that are rated @ 4.35 VDC +or- .05 VDC. The Sanyo 3000 mah cells have the lowest Internal Resistance. :D I use them in my Direct Drive 445 lasers. Never had a driver or laser diode failure . . . LarryDFW

Having used hundreds of various #18650 cells, I am not a big fan of Sony cells . Internal Resistance is generally too high. They are better than the Chinese brands. I like Panasonic & Sanyo better. LarryDFW

First of all, two 16340 cells store less power than a name-brand #18650. Looking at the most popular 16340 cells, they are 880 mah. The Panasonic 18650 cell has 3400 mah or or 386 % more current capability. This means the 18650 cell will have much more power, enabling longer run times before...

I'm not a fan of most cheap chinese protection circuits. I've seen too many fail, and don't like the added internal resistance. All the cells I sell are without protection PCB's. LarryDFW

Misho; I also think the problem is the flat top on your cell. I have 3400mah Panasonics with the button top: You could also get an electronics guy to solder a button on your 3100 Pany cell. LarryDFW

They do have two 7135 current versions: 350 ma & 380 ma. LarryDFW

Just use a NCR18650PD cell. It will deliver up to 10 amps depending on operating temperature. http://laserpointerforums.com/f67/new-panasonic-18650-high-discharge-cell-80701.html LarryDFW

Even though this is a high drain lithium iron phosphate cell, the red hot strap could melt thru the PVC tube at the positive end, causing even more dangerous higher currents ! Does show the potential damage of shorting a charged cell's terminals. LarryDFW

Panasonic has a low IR, high current 2900mah cell: http://laserpointerforums.com/f67/new-panasonic-18650-high-discharge-cell-80701.html Of course, I would not torture the Cree XML any more. :evil: LarryDFW

If these are in series, then you are drawing too much current. (especially if they are not name-brand cells) IMR cells would perform better. LarryDFW