I have just purchased 4 new Sla batteries for my EVT4000e. Along with the batteries I purchased 3 battery optimizers ( http://www.powercharge.dk/default.asp?lang=en). I was told that 3 were required but I can't figure out how to install them. I assume the installation will be similar to that of the Batteq and powercheq omptimizers. Can anyone help me out?