really looking into getting specific batteries for each unit, the 7cv and 7sv. the down view draws .55 amps and the sv draws .66. if I were to get a couple little batteries, say 12v 7ah or 10ah that are sla and rechargeable, that should do the trick? anybody else go this way? I have so many other things to my cranking battery and am concerned about the interference from it all and with two units hooked up to the same battery. those little 12v can be had for 20-40 bucks and I can tuck them in my compartment in front of the dash. thoughts?