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battery acid leaking

3896 Views 5 Replies 5 Participants Last post by  kmssgoten
need a new battery for a few months now,showing signs of needing it replaced soon(even more so now) i also installed a full on sound system in the OB. whats a good battery to get(never had to replace one before) what am i looking at in amps and in warranty also can handle a good load under sound system blasting, also the group, read about 34,35 and 25 all i know is the sizes whats the difference in them...price isn't a problem if i need it to last and work under torment

sound system spec

amp 112rms 4x with a 575rms mono, all one block
100rms front and 60rms back
350rms sub
and headunit with lcd screen (movable background)

i am not using the amps full on potential right now maybe in the future i will, also like to have better knowledge but these

other note i am not getting light dims when driving and system on,just seems to have a hard time starting then if i leave dome light for 10min working on the inside of the OB
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· Registered
Fresh Out of Outbacks!
14,519 Posts
A lot of batteries are made locally because they are so heavy to freight around. This means one factory spits out a bunch of walmart brand, then the same plant spits out a bunch more identical batteries labeled diehard for sears, then a bunch more identical batteries labeled for NAPA etc.

So local reviews count more than brand or model names. Some review sites/magazines take this into account, others ignore it.

There are some batteries which are made in one spot and trucked to wherever they are being sold. Typically those would be the super premium ones where they have a lot of profit margin in the first place. But now you know you're paying for freight, not necessarily battery quality.

· Registered
2000 Outback Ltd.
205 Posts
The 35 has top mounted battery terminals while the 25 has both top and side terminals. I think the side terminals are for GM cars but that's what I used because I wanted the versatility of tapping into the sides for future upgrades. There are 2 types of battery that you can use. There's the regular flooded battery and the AGM type. AGM's tend to be better because of the purity of lead and overall technology.
Looking at your amp specs, it looks like you can draw up to about 76 amps(1023/13.4) with them. If you add your car's essential operating draw, headlights, wipers, maybe heated seats and fogs, you probably easily exceed your alternator's max output capacity. This is when your car starts taking from the battery.
Since you are looking for a battery that "can handle a good load under sound system blasting", I would suggest a deep cycle battery. A starter battery is just that. It is meant to start your car. If you were to discharge a starter battery more than a few times, it would never be the same. A deep cycle battery is designed to be discharged hundreds of times and still offer the same power after it's recharged. Keep in mind that a battery upgrade is only part of the equation when you have a high electrical load. You might want to consider an alternator upgrade as well.

· Premium Member
(formerly) 03 H6 OBW , (presently) 06 WRX Sportwagon & 2021 Honda CR-V
19,685 Posts
yeah, if you feel you will be discharging the battery a lot, a 'marine' battery or other battery designed for deep cycling would be best.

For a more 'normal' but 'upgraded' auto battery, consider the top-of-line battery from O'Reilly's , made by DEKA (East Penn ?) and is a sealed, silver-improved AGM technology. Long replacement and prorated warranty too. Many folks like Optima and they make a deep cycle type.

· Registered
Car: 2008 Tribeca, 2010 LGT, Sold: 2005 XT Limited
2,942 Posts
Optima 'yellow top' is a favorite for deep cycle automobile batteries. Autozone often has 20% discount coupons and free shipping, making these a good value.
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