Everyone seems to be hot on this battery mod to use two 3.7v NiMH batteries for longer life in your TX. Great idea, but once you have them configured in the two battery (2 cell) pack, how do you charge them? Most good chargers will have settings for the NiMH batteries but how do you monitor them for balancing - they don't have a balancing plug like LIPO's.

Any thoughts or ideas? Most have protection circuits, but how do you know when they are fully charged?

Thanks in advance for any useful information.