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js said:
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Bullzeyebill said:
Wilkey, is there any advantage using a Kan 1800 AA, over say a Powerex 2000 AA when the draw is around 1.5 amps? Will the Kan maintain the current better than the Powerex, and longer?
Bill
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The voltage-current graph of a lamp (I-V curve) is sloped up such that increasing the voltage means a higher current draw, but it is nowhere near a 1 to 1 ratio. The current goes up rather slowly as you increase the voltage--in the operating range we are considering, anyway.
High current batteries--as Ginseng said--hold their voltage under a high current draw. High capacity batteries do not. Also, some batteries have an internal resistance which is too high for use at 3+ amps and they will overheat and get damaged over time, thus reducing the number of cycles of life you could expect from them.
I can't answer this specific question as I have no experience with either cell, but what I can tell you is that the 1185 draws over 3 amps on 9 cells, and that very few AA cells on the market today can really handle that kind of current draw gracefully.
If it were me, I would use the KAN 1300's. 3 amps is nothing to these cells, and many would say that they are "overkill" for this current draw, but that means a very nice voltage vs. time discharge curve, and significantly more lumens from the 1185. Plus, given the resistance of the 3-to-D holders and Mag switch, I suspect (BUT CAN'T GUARANTEE) that insta-flashing wouldn't be an issue. And these cells are a benchmark of AA cells and have a low internal resistance and will not heat up that much and will live out their full number of cycles with aplomb.
Just my $.02. Most people think I'm a bit out there, though, so be forewarned. hehe.
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"unofficial Ginseng researcher" chimes in with linky:
Preliminary Testing: V2 3-D Adapters
Instaflashing on Badass 4ah 1/2D Aero NiMH's---Nipples, nipples, nipples
Few RC style/high current delivery cells other than the 4amp/hour 1/2 D Aero NiMH can supply enough amps at sustained higher voltages as these 1/2 cells, so chance of instaflashing is unlikely.
Need to find a good AA Nimh cell
There are also these other 1800ma NiMH cells mentioned by js in this thread. I think there is a typo for the KAN, 1800 or 1300ma?
Although untested by Ginseng (see Ginseng, the questions are going to come back ;-), Wayne would have been happy to send you back the 3AA-D adapters to have you test other batteries /ubbthreads/images/graemlins/smile.gif);
I suspect, due to the fact they will take almost 8amps on charge; either the current Rayovac IC3 2000ma 15min. charge AA's will work well enough, as will the 2200ma 15min. charge Energizers due to hit the market by the end of the year. Can't have much fun if your high drain bulbs exhaust the batteries in 20 min or less---and it takes overnight to recharge them. These will not be a potent at the true high-current designed cells I suspect. They will heat up more, but the trade off is super fast charge time with the inexpensive dedicated chargers.
Huh js, only Ginny & I think Ur 'out there' /ubbthreads/images/graemlins/grin.gif, and since we're also mad scientist flashaholics, our opinion doesn't count. The adapters are not likely the 'weakest link' as far as resistance. Keep the electrical pathway of contacts clean on either a standard M*g or M*gChr; if you want full brightness, less heat generated inside the body, and more power actually going to the bulb.
Seems to me we will have to come up with longer acronyms for the various bulb M*g mods, M*g3D85? Can the EL 3AA-D's fit in the M*gChr also? If we ever see protected Li-Ion C-cell's, then we'll have M*g3C85 also.
Slavin4U Li-Ions thread
