I am planning to remove the power supplies on my remote repeaters and connect directly the RBs to the Battery Pack.
I found out they can work at 12v generated by a 150A Battery without problems, but it was a laboratory test..
In a remote site I have like 12 RBs (532, 333, 600, 433) with max 4 radios (in the RB600). In that site there are 12 batteries 150A each.
ATM the power supplies are 24v and the cpu and radio load is pretty high on some RBs. Right now they are working good.
Will I have troubles with power switching everything to 12v? Do RBs and Radio suffer of it?

Should i make a 24v battery system? Or i can stay to 12v?
(P.S. The distance from PoE and the RBs is max 10m cat5 eth cable)

Thank You

Looks good to me. I use a 150A 12V marine deep-cycle battery to power:
1 RB333 with 3 R52s
and
1 RB433 with 1 R52.
From a full charge, it will easily last 48 hours with no charge at all. I use solar to charge mine. I run a separate 16ga outdoor-rated power supply wire rather than PoE, but the length of your run does not look too long for PoE.

ADD: If you are going to use batteries, I highly recommend a Low Voltage Disconnect, or risk losing the product key or damaging the Routerboard. See my response to the post at http://forum.mikrotik.com/viewtopic.php?f=2&t=28687

Thank you SurferTim.
Then the only thing i need to be aware is to not let the voltage drop under 10v..