HELP?? to isolator or not to isolator

[Joe562MMA]

ok i been deciding weather or not to run an isolator for when i install my 2 back batteries i heared isolators are usless ..
then i heard that i can run a isolator relay,,which just looks like a solenoid to me any help would be appreciated..

im running a 235 h/o alt//
one yellow top optima in front
an i plan on running too UPS 12-370FR c&d batteries in the back

[mclerico83]

if you decide to isolate i have the only isolator you want, do not use a real one they are no good. I used one and loved it as i didnt have to worry about power drain from my car system.
Stinger S2402 240-Amp 3 Post High Current Isolator

will do 60 shipped on it supports up to 240 amps