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Thats a pretty old peak charger I've got. It's not really made for smaller batteries, its for 1/10 cars.
I just use the trickle function which is 400 ma.
To make a similiar charger, take apart the charger part of your controller and remove the plug. You could also go to radio shack and buy a similar plug.
Connect it to your battery charger and viola!
Peak chargers aren't cheap, for one that charges 1-8 cells, you're probably looking at $75-100 dollars, take a look at towerhobbies.com.
If you don't have a charger, I'd go to radio shack and buy a 800 ma ac adapter and wire that to the plug.
Go read in the bit section about stand alone chargers, there are better instructions there.
If you go with the ac adapter, get a multi voltage one so if you add more batteries you can flip a switch instead of buying a new adapter.
Also with the ac adapter be sure to time it for about 5 min, you don't want the batteries exploding.
About adding batteries, I don't think it'd be that hard, I'm thinking about doing that this week, I'll let ya know how it goes. I'm going to try and add one under the pcb.
Sorry for being long winded, hope this helps, I know it can be frustrating getting started.
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