Help picking a battery

[CrazyKenKid 64]

Hey guys my little brother is looking to purchase an extra battery for his setup.

Here is what he has:

1-SAZ1000

2-SA12's at 1ohm

Big 3

Decent 35-40ah starting battery, it has a green top so an interstate I beleive.

his car is a 96 ford escort

soon he will be adding a 2 channel amp to drive a pair of speakers or maybe a 4 channel we will wiat and see. The amp will be driving normal coaxial speakers! the amp might be a 125.2 or 50.4~

I was looking into a battery for him on the SSA store and these two caught my eye's

http://www.soundsolutionsaudio.com/store/products/XS-Power-D975-12V-AGM-Battery%2C-Max-Amps-2100A-%252d-2000W-.html

and

http://www.soundsolutionsaudio.com/store/products/XS-Power-XP950-12v-AGM-Battery%2C-Max-Amps-950A.html

to me the basicaly look like the same battery with similar rating just a different price and the XP (cheaper one) appears to be more geared towards an extra battery and not an starting battery.

Is what I am thinking correct? Will this battery suit his needs? is there another battery I should look into. And no he doesn't plan to upgrade for about 3 years or so.

[CrazyKenKid 64]

actaully i think I found my answer to XP vs D

http://www.soundsolutionsaudio.com/forum/topic/54011-battery-selection-confusion/

basically D=comps and XP=daily! lol enough said!

now will the 950 be what we are looking for? opinions? comments? suggestions? and thanks in advances!

[KyleBrown 121]

need more powa for those subs unless you build a big box, that batt will work fine

[CrazyKenKid 64]

the box is 4ft^3 tuned to 33hz with a 18"x3" port

and on 1krms (500rms each) those subs get down and loud! I feel they can take more power but for a budget build this is good enough!