I have bought a couple of cheep toy tanks, just out if curiosity really. 
they have a 2.4 G TX that takes 2X AA`s and a small 3.7v  lithium in the 
tank. Im actually quite impressed with the range/control of the little 
fellas. they have a run time of about 20-30 minutes then its a usb 
re-charge. they even have a little sound board making tank noises, inc 
cannon/ machine gun/ engine. 
The only thing that lets these tanks down is the machanical build 
quality.the tracks fall off all the time. 
What I am wondering is if the electronics could be "up powered" to trigger 
12v relays, I have searched t`interweb for many hours never finding any 
clue if a 12v relay can be triggered by a 3.7v source. 
Does anybody know of such a relay or solution ? 
Much appreciated 

Neil R 

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