Futaba Chargers. - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Electronics Discuss radios, chargers, etc...

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Old 06-03-2007, 05:48 AM   #11
I am: Boolean21
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moo is right on with a series resistor to limit the current. An even better way is to start with a high enough voltage to put a LED in series. The LED is "non-linear resistance" acting much better to regulate the current with an added benefit of visual indication. That is how the radio manufacturers make their chargers.

It is ok to charge longer at lower current, to a limit. If nicads are left on a very low charge for a long time (<c/20), they will grow crystalline structures internally. That would dramatically increase the self discharge. I am not sure if nihms are affected the same way.
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Old 06-03-2007, 02:46 PM   #12
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I am: John Davidson
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EVO(12), Futaba
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Sorry I missed you but I had a great afternoon with Dennis and the guys. Maybe next time when I am down. I also have to figure out how to get a model on board. I still have my 2 box's that I made for my FAI's and will have a look at them for travel.

No problems Although if it were me doing the charging on the battery's I would look for something at least C10 rate. The only time I charge at C10 is when cycling. Otherwise I fast charge and don't seem to have any problems. The LED inserted in the charge output line should as far as I am concerned be mandatory. From the old systems I don't know how many times I thought I was on charge overnight and in the morning I could not fly. The Royal EVO does not have an LED but I installed one in mine.
John Davidson
Keep the shiny side up and the wheels down
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