Nice to see you hear @chaudhary9. For your first question: That's why I created this thread so that we can discuss any security ideas like the one with separate battery. Charging should be no issue as you can get a thick wire from main battery to secondary battery and additionally can have a high amp diode with it so that separate battery has nothing to do with other functions but only alarm system.
Now I was also thinking why installer chose hood for placing security system.... due to battery near by?? So if we have separate battery then why choose same place? we can choose some other place for installation of this system like under the dash or in the trunk (idea is to use a wood box for holding the stuff).
Yes a I mentioned in my main post opening the hood and cutting alarm/speaker is not big deal.
and yes I am thinking of getting 2 way steelmate installed in my car but need to clear few things.
1- What types of sensors its equipped with?
2- Does it also has connection with Hood so it vibrates the transmitter when hood is opened? as mostly I have seen trunk option.
3- If thief manages to open hood without notification and cuts wires then?
Any idea what would be its price now a days as I visited a shop yesterday but they only have 838 model which they offered to install in 4500 complete with labor and door locking motors.