Russel
Enlightened
I don't remember the material sizes of the top of my head, but I'll look when I get home and post more info. Do you have a mill and or lathe?
Testing C/D cells in Maha C9000
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I have neither. However, if you can just provide a link to the white plastic "dummy" cell and the brass ends, I will be able to fabricate the rest myself.
I wonder if there is a place that sells good quality brass or copper springs. I have one of the original 2 D cell black battery holders (I got it from Radio Shack) and if I can get a better spring with less resistance I'll be good to go!
I also hear there are magnets people use. Do you know anything about those?
I wonder if there is a place that sells good quality brass or copper springs. I have one of the original 2 D cell black battery holders (I got it from Radio Shack) and if I can get a better spring with less resistance I'll be good to go!
I also hear there are magnets people use. Do you know anything about those?
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Russel
Enlightened
I wish that I could, I'm sorry if I wasn't clearer in my earlier posts. I made the dummy cells from teflon rod. I drilled out the center, cut internal threads on the inside of both ends and milled the center opening where the wires come out. The brass ends were turned from solid brass rod, threaded, and center drilled with a lathe.
I don't think that brass or copper would work very well as springs, too soft. I don't know of any, but it may be possible with brass, it isn't quite as soft as copper. You might consider just using copper as the contact with a wire soldered directly to it on the end of a steel spring.
Darn. I wonder where to get a teflon rod like that? Would me cutting a wooden dowel into pieces that's the width of an AA cell be a good idea instead? If you don't know where I could get a teflon rod like that?
I just got a great deal on Tenergy D 10,000 mah cells on ebay. THey are the model number 10100. Of the five modes of the MH-C9000, which is the best for D cells? And what did you put as the charge and discharge rates?
I just got a great deal on Tenergy D 10,000 mah cells on ebay. THey are the model number 10100. Of the five modes of the MH-C9000, which is the best for D cells? And what did you put as the charge and discharge rates?
Russel
Enlightened
OnlineMetals has nylon rod, as well as many other plastic and metal materials. Both wood or plastic would work for making a dummy cell.
For normal charging of 10000mAh NiMH cells, I use a MH-C808M charger at it's default rate of 2 amps. I do however use the MH-C9000 to run the D cells on a break in cycle once a year. I set the break-in capacity to 10000mAh.
Unless you have one of the original MH-C9000 chargers, it won't fully charge a 10000mAh cell in one cycle. The break in mode does work with large capacities, but I think the other charging modes are limited to something like 4500 to 5000mAh. (The charge capacity max. is in this thread somewhere) To charge large capacity D cells with the C9000 you could always set a 2000mA charge rate, then when the charger stops due to it's programmed maximum charge capacity, simply start another charge cycle and it should completely charge the D cell, assuming the cell was completely depleted. Of course, if the cell needs less than say 4000mAh to fully charge it, one charge cycle will do the trick.
Do you know what size specifically of the nylon rod for me to buy for my adapters?
If I do a discharge at the maximum capability of the MH-C9000 (what is it, 3,000 mah?) and then just charge it in the MH-C808M wouldn't that be fine? That should tell me the mah capacity of each, correct? My main goal is to make sure none of my D cells are bad, and to do cell matching. After doing MANY tests of my specific MH-C9000 I have found the four bays are skewed with thier readouts. From highest to lowest readouts of battery mah capacity, it goes Bay 1, 2, 4, 3. And I have the percentage difference so I will apply that when I record the data using my D cells in the MH-C9000 charger.
I wonder why Tenergy recommends charging their D cells at 1,000 mah instead of anything higher?
C & D adaptors are now made by Maha for the C9000!
Go get 'em...
The one time I actually liked a neco-poster, thank-you sir.
I can't say I use C/D cells very much at all, but, it's still handy to have the adapters.
Think I'm well overdue to update the whole unit actually, unless it hasn't changed at all in the last 2yr?
P.S. You got any actual links to these adapters?
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AFAIK Maha does not make adapters like these. I got mine from an ebay seller called 'rdana'. I believe they're made by a company that also makes the BM200 charger. This charger has some interesting functions, but I prefer to stick with the Maha. The adapters fit in either one... but I did have to shave a tiny bit of plastic off the Maha, just above the positive contacts, for the adapters to work properly.
samgab
Flashlight Enthusiast
Have you seen the SkyRC NC2500?
The C9000 hasn't been revamped in any way recently that I've heard of, but the NC2500 is a bit like a revamped updated C9000 with a few new tricks, eg graphs and control via bluetooth to iPhones/smartphones.
Almighty1
Newly Enlightened
Anyone know if these works with the skyrc NC2500?
C & D adaptors are now made by Maha for the C9000!
Go get 'em...
Where?
Turbo DV8
Flashlight Enthusiast
Search eBay for seller "rdana." He sells two for $9.95, free ship. However, he states in red that although these will fit the C9000, "...Measurements are unreliable in discharge mode. Therefore, capacity testing is unreliable in some C9000 chargers. The adapters are not guaranteed to work in the C9000."
I bet it's right back to the same old problem ... contact issues.
I bet it's right back to the same old problem ... contact issues.
