when i started this thread, the only thing i knew was that this alarm sounds when some1 is trying to enter the car for stealing it (the purpose of it).
now i know:
1- that this battery is the only other besides the 1 to start the engine;
2-that if the battery built-in goes bad, there are no signs that warn you in advance. just dies.
3-and this may happen in the worst situation (as in the middle of the night), and if you dont disconnect the cars battery right there, it will discharge and you cant start the engine and have to recharge it.
4-even if you are able to disconnect the car battery right there, you still have to disconnect the alarm, and this means doing all the procedure right there, or you cant drive the car.
with all of this considered, and, as i dont live in a place that is high risk, i decided just to disconnect the alarm, and did this at my convenience.
in my case, i installed a bar at the steering wheel, that is visible, so it discourages the thief. the car cant be driven if not removed.
and this is all that i need after all.
thank you all that have contributed.
this is the bar: https://store.winner-intl.com/the-cl...llow-p257.aspx