I’ve got plenty of high drain liPos since I also do RC flying, but aren’t NCR18650B’s tested above 10 amps and favored by e-cig folks? I’m also pretty sure they can do more than 7A bursts, perhaps not their protective circuits.
For accu screwdriver I need only over discharge protection, I don’t need overcurrent protection. If it turns out to be too complicated, I’ll just run them without protection and look for torque reduction as end of charge signal.
I’ll do a review and high current test when they arrive.
edit: yup, I got something mixed up, in my head. They are not recommended for 10A currents.
I don’t quite see how to modify the above linked device for 1 cell, you need 2 more or in series to use that device. Now I’m guessing it wouldn’t be too hard to adopt this idea for these cylindrical cells. Perhaps this would be another option, that way you don’t have to mess with protected cells.
I got plenty of those voltmeters and low voltage notification thingies from hobbyking, with light and/or sound, and voltmeter readings, but I wanted more of a fully automated disconnect circuit that would simply stop supplying current when input voltage is below 3V.
edit: to have sort of a conclusion for reference, this seems like a very good high drain battery, up to 30A
it’s not an easy task to find high drain protected cells with a circuit capable if providing more than 7 amps without tripping
if you really need protected and need that current, I can’t tell you any cell other than that one you linked, maybe other have an idea, i don’t, sorry
I think you misunderstood - I’d like to buy unprotected or protected NCR18650PF based cells, if they’re protected I can remove the protection if it will be tripping.
I’m only asking where to buy genuine NCR18650PF cells.
Nice price, 10 cells are $17.5, but the shipping is also additional $17 for me (Sweden). Have you had a chance to test their capacity? i can’t find a review of those cells, only 2600mAh version comes up. Perhaps these are old 2600 cells which lost their capacity so they are now being sold as 2000mAh ?
I have not tested them. They look identical to the laptop pulls I have found in the past. I forgot to test the voltage on the last batch I bought. If I recall my first batch they were around 3.8 volts when I got them (that depends on the meter you use too, lol). I can say that they took about a hour or so to fully charge up on the I4.
If all you’re interested in are 15A pulses, the Panasonic NCR18650BD might be a better choice. Maximum current may not be as high as the VTC5 - only 10A maximum continuous and 15A pulse (enough for your needs). But with 3200mAH, capacity is quite a bit higher - almost as high as the NCR18650B.
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that’s a much better option for your needs, take a look at mountain electronics to see more options, if you like[/quote
Just bought 6 panasonic 18650 3400mah protected from them.