The only reason that I've been tempted toward electric turn signals is the inability of drivers to understand the signal for a right turn. (Hard to believe they don't understand, but it seems to be the case)

Maybe I'll try using the hand-up right turn signal with my hand curved over my head, index finger pointing to my right. The stop signal might be used with all fingers spread in an obvious "stop" gesture.

Electric turn signals are still tempting, but I'm afraid that anything that is really up to the job will require quite a battery.