Well if you want to get technical. If your only ever using the sound system while the car is running. No matter how big the battery is it wont make a difference. Its all about the alternator!!

Maintenance free battery. means its 100% sealed. no adding water extra. Its a gel battery and generally have a longer life!


To add all a battery does when a car is running is stabilizer the voltage.

So as i said go to the shop. Pick out one exactly the same. And choice what quality you want. Depending on how much u wanna blow. I always get the cheapest as they still last 2-3 years!!!!!