2 of 2 people found the following review helpful
Great batteries for my Fenix lights,
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This review is from: Smart Li-ion 4 Channels Battery Charger and FOUR 3100mAh Panasonic 18650 Lithium-ion Batteries Charging Kit (Electronics)
Got this set of four Panasonic 18650A batteries due to the high esteem that Panasonic batteries enjoy in high-performance Li-PO circles. They cost more than some, but also are heavily documented on Panasonic's site, various forums and several high-quality review pages. You get what you pay for.
* High-quality cells bearing the NCR lettering and a faint QR code
* Spec sheets and full manufacturer information available on Panasonic's website
* Take a full charge (4.21V with no load, after charging)
* All four work correctly (tested for a couple minutes on my flashlights)
* Comes with a 120V US wall wart with 56-inch (appx 1.5m) cord
* Comes with a 12V cigarette lighter plug with the same length cord (56-inch / 1.5m)
* Four bays, each operating independently of each other
* Charge indicators are large and easy to discern (versus a small LED)
* Red indicators, one per bay, light while charging
* Very useful 90% charge indicator (blinking green, one per bay) is also a safety feature
* Solid green indicators, one per bay, upon completion
* Did not cook the batteries (they stayed room-temp for the entire cycle) -- especially important for Li-PO cells
* Lightweight case with attractive styling
* Door is vented, and latches closed for safer charging
* Spring-loaded negative pole adjusts to accommodate various length cells within the 18650 family, and also is labeled as capable of charging these other cells: 17500, 17650, 17670, 18490, 18670
* None discovered. Everything is as expected.
Seems like everything's in order here, a solid purchase. Some random items: input requirements are 12V DC, 1.8A. The per-cell charge current is listed at 1000mA at 4.2V. The 4.2V specification squares with the max recommended charge voltage per Panasonic's specsheet. The conversions are a bit odd, but the 1000mA appears to be within spec of a safe charging duty cycle. Given that the cells did not heat up at all, I believe the charger and cells are well-matched for safe charging.
I see differing information on whether Panasonic makes, or doesn't make, protected cells. Panasonic's specsheet for these 18650A cells lists a requirement that Li-PO cells are protected by a thermister and have a circuit, but the negative end of these doesn't have the telltale disc and they're shorter than advertised-protected cells. I can't speak to the cells being too short for Nitecore PM11 flashlight, but these indeed are a bit shorter than the pair of UltraFire 18650 batteries I have. These cells measure 65.2mm, which is exactly what the Panasonic specsheet lists as their size (with protection circuit). I am not about to run a live test to verify that they have the necessary thermal, over- and reverse-current protection, but given that everything else agrees with Panasonic's design sheet, I am inclined to believe they are protected in some fashion, though perhaps not by the tiny chips that some have in them.