Recent content by jasonck08

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  1. jasonck08

    Test/Review of Keeppower 18650 3500mAh (Black) 2015

    Double wrapped may have compatibility issues in maybe 10-20% of flashlights.
  2. jasonck08

    Any 100A 26650 Batteries on the Market?

    125A continuous? I'm only aware of a 70A A123 26650 with 120A 10s pulse. The ANR26650m1
  3. jasonck08

    KP3100 (4) not taking a charge...

    The behavior is strange. I would probably remove the heatshrink to test the cells voltage to insure it is healthy and to check for damage on the PCB board. You can always buy replacement heatshrink for a buck or two on ebay.
  4. jasonck08

    Xeray BarnBurner battery PCB problem. (previous model)

    Re: Xeray BarnBurner problem. Help please. (previous model) I'm not sure what LRD P730 is, but it looks like it could be a fuse or thermal fuse. Check for continuity from B- to the other connection in the bottom left corner. Also, have you checked each individual cells voltage? Make sure all...
  5. jasonck08

    Batteriser on Indiegogo

    Yea so on average, people that buy this product will probably end up wasting more batteries than they are saving. Most people buying this type of product wont have the knowledge to know what types of devices they should and shouldn't use this product in. And the type of people that do know...
  6. jasonck08

    Batteriser on Indiegogo

    It might help in those 0.1% of devices that can not operate when the cell voltage is <1.4v. Useless device for 99.9% of situations IMO. Their marketing is downright deceptive.
  7. jasonck08

    Batteriser on Indiegogo

    It's a bs product, it's been debunked. https://www.youtube.com/watch?v=4iEshd6izgk
  8. jasonck08

    Test/Review of Keeppower 16340 700mAh (Black) 2015

    The button top is probably built into the cell itself by the cell manufacturer, rather than being spot welded on (as in the case with basically all 18650s). So it adds less length.
  9. jasonck08

    Internal Impedance Measurement Sharing - Lots of Batteries

    I'd love to see some examples of where it can be off by orders of magnitude. The site you linked to has some really wild results such as a cell that has roughly 0.8 mili ohms DC resistance has around 15 mili ohms AC resistance. But it does not state the cell type/chemistry used in the test.
  10. jasonck08

    Internal Impedance Measurement Sharing - Lots of Batteries

    I understand what you are saying. But for me personally if I test a power tool grade battery and I do a 1Khz impedance test on say the Samsung 25R, it registers around 14.8 mili ohms. Then I do one on a VTC5 and it registers about 12 milio ohms. If I do a discharge test and compare the...
  11. jasonck08

    Found: a good looking high current cylindrical cell holder for charging/discharging

    Interesting, I personally use a clamp I made for myself. Would be nice i f they had a higher current version for up to 30A. Guess I'll stick with my home made clamp for now.
  12. jasonck08

    Recommended Charging Currents?

    Tom is right. I would say probably the industry average for "recommended" charge rate for 18650 (laptop grade cells) is about 0.5C. Sometimes I see as high as 0.7 or 0.8C. Generally you never want to charge a non-high drain Li-ion cell at above 1C, or discharge above 2C. I would say though...
  13. jasonck08

    Internal Impedance Measurement Sharing - Lots of Batteries

    AC 1Khz impedance tests though are still the industry standard. I've always seen a direct correlation between AC 1Khz resistance tests and DC load curves from cells.
  14. jasonck08

    Protected battery giving higher output than unprotected?

    Several things could come into play. A protected cell could cause your light to put out more lumens, in the same way that adding a resistor could. For one though, a protected cell (depending on how many and what type of mosfets) will generally have about 10 miliohms (measured at 1Khz AC) more...
  15. jasonck08

    Continuous vs intermittent discharge

    Re: Added: Panasonic NCR18650 B Interesting comparison. Also take note that most 4.35v cells have a rated average voltage of ~3.75 to 3.78v @ 0.2C discharge. The Panasonic on the other hand has a 3.60v rated voltage @ 0.2C. Also, LG is coming out with a 3400 and 3500mAh cell very soon!
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