I just use an old "wall wart" with a current limiting resistor in the plus line. 200 ma for 2000 mah eneloop cells. Monitor with a voltmeter and stop when getting up around 4.0 volts. These batts will hold a charge for over a year!
Missed you at Tulsa!
Don

Jim
I use three of the eneloop AAA batteries in my Go Devil with Stovepipe Atwood...   good for 5 - 6 flights or more....

Jim

Jim
I normally use a booster withe three AA eneloop batteries, just because....   However, if your sparker is starting in a flip or two ( like yours normally does!!) I don't think the booster is necessary....
Jim

The Eneloop cells will put out all the current you need to start without a booster. I will assume you are using some kind of transistor unit. Takes the point problems out of the equation. Typically, the ignition system draws about 7-800 milliamps while running so in theory the Eneloop cells should run over two hours of run time. A 6 minute run will consume about 80 milliamp hours. Translates to 20-25 flights. I like these cells!
Don

I think just about everyone is using some sort of transistor ignition now. Don, I have one of yours with the cut off that now has many hours of running on it and it is still going strong. I also have one of Floyds that is still going strong. I have a few with just a single transistor that work well also. All of them work, even a condenser will work just fine. The transistor units are better in that they do not burn the points, and it is not so critical to have them perfectly clean but it sure helps. I was out flying Ringmasters today with Andrew Hathaway, and he brought out his Humongous. He put up four flights with it and it started second flip every time and had a perfect motor run every time without touching the needle from the last time he flew it at Topeka's contest a couple of months ago. He is running one transistor and three AA NIMH batteries. When things are right these old sparkers will start easier than glow and make you smile.