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The new Sanyo NCR18650BF cells do maintain their voltage better with lower Internal Resistance. Anode has added Silicon Oxide . . . Here is more detailed discharge graph comparisons: Cell Comparison NCR18650B vs. NCR18650BF

The Samsung 25R #18650 cells are the top performers for high current draw . But they only have a capacity of 2500mah . . The new Sanyo NCR18650BF cells do maintain their voltage better with lower Internal Resistance. And, of course, they have the highest capacity @ 3400mah (36% more than the...

The ONLY cells that have been completely tested to UL1641 safety standards are: Sanyo, Panasonic, LG, Samsung and a few other "name brands" . . Do not buy any others for safe operation . .

Those aren't Panasonic cells in your photo. Panasonic cells should NOT be dropping that much under the 2Amp load you described . LarryDFW

I recognize the Samsung (pink), Panasonic (turquoise) and Sanyo (red) cells . . . Lose the low voltage cells (below2 VDC) , and check out the rest . . . Watch for any excess heating when charging . . . . I have changed over to the Sanyo NCR18650BF cells for slightly better voltage output ...

Sorry about that error . . . It should be working now . . . LarryDFW

I would use the Samsung 18650 25R cells . . . They will easily handle the 4 amp load without sagging . . . I have some available @ $11.95 prepaid in contin. U.S. If you want 26650 cells, then I would buy King Kong 4000 mah cells.

I solder a button on the cells for my customers that need them . . . I do think the new NCR18650BF Sanyo cells are better . . . and we are currently switching over to them . . . LarryDFW

Re: Panasonic Releases 3400mah Cell ! Panasonic has printed labels with info on the heat shrink . . . Sanyo has data & info printed directly on the metal cover, but under the red heat shrink . . . LarryDFW P.S. we are changing to the new Sanyo 3400mah cell NCR18650BF which has improved...

The electronics may not have been the problem . . . Did you have the black heat sink on the laser diode when you were testing it ?? If not, it could have been overheating that caused the demise. Even your current setup with metal clamps is not ideal . . LarryDFW

There are some new "power 18650" cells that I would use . They are the Samsung 18650 cells with 2500mah capacity and a 20 amp current rating. These would work with three in parallel and not require such a large diameter . . LarryDFW

Just remember that the Panasonic NCR18650B cells will deliver more power to your laser diode . . . Keep that duty cycle down to reasonable times . . . I need one of these Green diodes to play with . . . LarryDFW

Benefits of a true 3400 mah Pany cell. LarryDFW

Bryan; You will need a Zener Diode + resistor to limit the voltage going to the 7135 to under 6VDC. Then you won't have to worry about the cell voltage. LarryDFW

Today, I checked the final voltage on some Sanyo cells I was charging. After the registered the "Full" display, I pulled them out and checked the voltage. It registered 4.22 VDC on both cells. LarryDFW

Jeremy; Did you ever test the runtime with the new Panny cells ?? LarryDFW

No; there are some cells rated for 20 amps continuous (25-30 intermittent). They do sacrifice capacity, to get higher current levels (about 2500 mah for the best ones). I plan on bringing some in to stock LarryDFW

This new 2-Cell charger . . . Charges 18650, 26650, 16340, and 14500 Lithium Ion Cells Selectable Charging Current of 1/2 amp or 1 amp on each channel Discharges Cells to Determine Capacity Analyses Cells to Determine Internal Resistance Comes with 115 VAC adapter, but also works off 12 VDC...

The order of 4 Panny cells was shipped and received. Thanks; LarryDFW

Alessandros; Your 4 ohm resistor is fine for testing . . . With my new analysing charger, I check I.R. every time a cell is inserted for charging. The good 18650's (Sanyo and Panasonic) are down in the 50 milliohm range consistently. According to 18650 Battery Testing Experts @ Cadex ...