Recent content by Ron Schroeder

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  1. R

    Test for how well batteries suit your charger

    I think the most important thing for consistancy of the tests is that the batteries be at a consistant temperature (preferably room temperature) before put back in the charger. I put mine in the flow of a fan in a 70 degree room for a while before putting them back in the charger.
  2. R

    whats your favourite low level light

    Nite-Ize 3 LED drop-in in a 2AA MiniM@g cut down to 1AA or a X1 gen 2.
  3. R

    What should be the Li-Ion battery voltage immediately after charging?

    Many chargers don't even have the CV phase at all so they don't give the maximum capacity or life of the cell. If they don't have the CV stage of charging, they will loose a few percent capacity by cutting off at 4.20V. Some chargers raise the cutoff voltage a little to retain capacity but...
  4. R

    Is there a charger that charges EVERYTHING?

    That's an interesting charger. I just might buy a few just to use the housing for cell holders. As a universal charger, it only has one cutoff for Lithium chemistry and one cutoff for Ni chemistry. So it's not very "universal". The Lithium cutoff is not suitable for LiFePo4 or Saphion or...
  5. R

    Is there a charger that charges EVERYTHING?

    Do You need to charge multi cell packs or just individual cells? Pictures won't help much. It's just a cigar box sized box with connectors on the front to go to various battery holders and a power cord and control cable on the back to go to a computer running LabView. By the way, I use a...
  6. R

    Is there a charger that charges EVERYTHING?

    Do you mean any individual CELL of any chemistry? That's easier.
  7. R

    CAP-XX Supercapacitors: 4.5V/cell for up to 100A in a CR123-like space!

    Yes, but you can charge a Super Cap in a couple of seconds, not minutes. A couple of second charge could give you an hour of 25+ lumen light. Not a replacement for batteries but it fits a niche.
  8. R

    Is there a charger that charges EVERYTHING?

    Except for the all voltages part, it's possable. I built a charger that will charge NiCad, NiMH, Li-Ion, LiFePo4, Li-Poly, Li Nano Phosphate, Ni-Silver, Lead Acid, AGM, Gell and even Super Caps. I am limited to a full charge voltage of 100V. Charge current limit can be controled from 10mA to...
  9. R

    Replacing cordless screwdriver battery.

    Re: Agree, but The reason that I didn't reccomend LiFePo4 was charge termination. The NiMH can probably handle the origional charger but the Lithium cells could be easily overcharged.
  10. R

    CBA II charge monitoring?

    I have used mine as a graphing voltmeter when set for a discharge current of .010 A.
  11. R

    CAP-XX Supercapacitors: 4.5V/cell for up to 100A in a CR123-like space!

    Maxwell makes a couple of larger ultracaps that are in sizes that are somewhat useful for flashlights. They are C and D size at 140F or 350F respectivly at 2.5V. That's still only a few hundred mAh but it's enough for a Rebel 100. You can get over 70% of the energy out of a supercap if you...
  12. R

    Replacing cordless screwdriver battery.

    Re: Agree, but Take 3 AA batteries and see if you can wiggle them around to fit the same space. If they will fit, make up a pack of 3 low self discharge Ni-MH AA batteries like Enloops to replace the dead pack.
  13. R

    Minimags - do they boost current?

    If you are going to use this for star charts with dark adapted eyes, you may want to run it at a much lower current. I would start with a 100 ohm resistor and see how bright it is in the actual aplication.
  14. R

    White LED lumen testing

    Hi jtr, Can you get reliable measurements from a very wide angle LED that only puts out about 5 lumens? I have some of the JKL 5mm LED "condoms" that convert a blue LED to diffused white. I am very interested in comparing that technology to the phosphor on die technology.
  15. R

    lighting up a room (power outage)

    Run a CFL on a string of those AA batts? 8 cell battery holder at Radio Shack - $2 bucks?
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