Considerable effort has been put into making sure the unit functions on as little power as possible. The RallySafe unit draws no more than your road car’s radio does on standby. The unit recognises when it is stationary, and quickly dims the screen and turns off non-vital transmissions to conserve power.
We have tested RallySafe units on small dry cell batteries for several days consecutively (while sending constant transmissions) and still not reduced the battery to under 12Vdc.