Steve,

Thanks, you definitely know more about it than I do. Hey by the way--just got a JR XF421 5 channel radio off ebay and it came with a charger-- one lead for the radio itself and the other for a the battery for the receiver/servos etc. I have a BEC so obviously don't need that one and want to convert it into a trickle charger (its rated at 5.8 V 50 mah) but it has three leads - positive, negative and a sensor lead --guess that makes it the light on the charger light up. Can I just splice the connector lead to the positive lead and then use it to trickle charge my batteries? Obviously I will check this using the methods we have talked about but it is the sensor lead that is confusing me.

Thanks
Greg