Ok this has been going on for like a year or two already but im lost with it
and BTW the car appears to have a batter to small for it since it sits like 2 inchs less than the battery space
But when the cars on and for example i press the brakes the power drops from 14volts to 12 and makes my stereo skip sometimes , or when anything with power turns on it drops to 12 but then go's back up

 

But my battery is very weak and its died about 15+ times on me , so i think a optima would fix that right?

 

you could try taking it to a place to get your battery recharged, if it can hold a charge if not than if you have warranty they should replace your battery. I have a 300 watt memphis amp running (2) 12's (comp kickers) and running a radar with two outlets to charge my IPOD...your car should be fine cause you don't have cams or pulleys

 

Yeah a more cost efficient way to help would definitely be just get it recharged, no need to go out and buy a high performance battery... unless you really want one

(I do too) lol.

 

How old is the battery?

 

Its been on the car since i bought it in august 06
but they annoying thing is that the Stereo cuts off when the volts drop down alot

 

Check your alternator too.

 

Size of it isn't a problem. I'm running a battery that's almost half the size of the oem battery and I'm running fine.

Check for shortage, bad grounds or alternator issues.
Does the battery light come ON when power drops?