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  1. W

    Charging A123 cells with a PSU

    One thing to be careful about when using a CV/CC power supply unit to charge cells. Be sure to set your voltage and current before attaching the cells, not afterwards. If your voltage is set lower than your cells when you hook them up, there is a good chance you will fry some diodes in your PSU...
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    2 Year "AW123" Test

    Li-ion cells don't seem to gain from cycling. I tested each of my AW R123 cells 3 times, and they did not improve over those cycles and usually got a little bit worse.
  3. W

    2 Year "AW123" Test

    Testing ten recently purchased AW R123 cells, I found a wide variation in their ability to maintain a 1 ampere draw. Amp-hour capacities varied from 288 mAh (way too low) to 515 mAh, the latter being reasonable for that rate of draw.
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    Maybe in the wrong forum? 17670 U2 Runtime

    You can find the actual runtimes somewhere on this forum, but it should be about an hour, maybe a bit more, on maximum level.
  5. W

    Undercharged 18650s

    Yes, my math was off. But hey, last night was a late one.....
  6. W

    Undercharged 18650s

    With the Triton 2, The final charge current for a 2400 mAh Li-ion cell will be 240 mA, so voltage drop will be .012 v for 0.1 ohm leads at that current. That means the cell would be at 4.188 volts when the charger was reading 4.200 volts. I can see where lead resistance will be a more...
  7. W

    Undercharged 18650s

    Lead resistance (within reason) will have not much effect on end of charge determination with the Triton charging Li-ion cells. The constant voltage phase of the charge is terminated at 50 mA. Each increase of 0.1 ohms in lead resistance will result in a voltage drop of .005 v at 50 mA, so it...
  8. W

    Batteries with low self discharge "LSD"

    Nimh cells are supposed to be capacity rated at a discharge current of C/5, which would be 400 mA for those Varta cells. Discharging at 100 mA instead will give slightly more favorable results.
  9. W

    Hobbico Accucycle Elite

    In my limited experience with the inexpensive RS cell holders, they do not handle high currents well, so charging rates were very limited. They are cheap enough to experiment with, though!
  10. W

    Batteries with low self discharge "LSD"

    My C9000 gave my Hybrids an average 2050 mAh and my Eneloops 1950 mAh. Obviously, YMMV.
  11. W

    Dissilussioned with NiMHs

    My Garmin GPS 60C works very well with Nimh cells.
  12. W

    My Eneloops charge to and hold a higher voltage than other LSD's

    In my simple tests, the Eneloops do hold a higher voltage than the Ray-O-Vac Hybrids during a discharge cycle. This even though the C-9000 gives the Hybrids about a 100 mAh total capacity advantage. This higher voltage can be important in some electronics that are not designed specifically for...
  13. W

    Eneloops - reduced capacity...

    Re: Eneloop AA are not that good due to reduced capacity My big beef with the 2500+ mAh cells was the high failure rate of some percentage of the cells after a few months. Their self-discharge rates went sky high, and charging cutoff became hit or miss. I haven't had this problem with the...
  14. W

    Energizer battery charger by USB.

    The first Thinkgeek charger is much bigger than the Energizer USB charger, and the second one only charges itself, not standard AAA or AA cells. They each have their niche, but they don't fill mine.
  15. W

    Energizer battery charger by USB.

    This is something I've been looking for. Can't wait to try one out.
  16. W

    new Kodac "Pre Charged" NiMH batteries?

    Kodak is using the phrase "stay charged up to 4x longer", just like Ray-O-Vac for their Hybrid cells. Given that phrase, the price, and the mAh capacity which is the same, I'd bet they are relabeled Ray-O-Vac cells.
  17. W

    Charging Li-Ion with ripple current

    Its about 10%. And about the same between 4.2 and 4.3 volts. Charging to 4.3 volts wouldn't mean the cell is going to explode, it would simply last many fewer cycles of cell life.
  18. W

    Charging Li-Ion with ripple current

    I think if left on the charger it would almost as damaging as charging to 4.3v. Could you set it for a nominal 4.1v end of charge voltage? That would probably be easier on the cell.
  19. W

    Managed charge level -- 95% lithium Ion

    The DuraTrax ICE, and I think the Triton let you choose either LiPoly (4.2v) or Li-ion (4.1v). 4.1v would correspond to about 90% charge level. I think you can also have the Duratrax ICE input charge to a percentage of maximum input capacity, which will give you some more control. I'm not home...
  20. W

    ProGold or DeOxit, I don't get it

    I'm of the same mind as Abouna. The DeOxit instructions say to leave a very thin film of DeOxit on the contact. Seems that is serving the same function as Pro-Gold.

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