dual battery help

[dlg3413 10+ year member]

hi i need some help with my system. ive got 2 sundown 10's an a 1400 watt hifonics amp. even though my truck has a decent electrical system as it is stock, the voltage still drops sn i want to put another battery in it(it has an extra tray for one). when doing this, how would i wire them up an do i have to have 2 of the same batterys or can they be different. really dont want (or have the $) to buy 2 new batterys. any input appreciated

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[mylows10 5,000+ posts]

2 of the same kind is better, but just add the extra battery and run + to+ and - to -

 

[dlg3413 10+ year member]

k. thanks. i was just wondering because i read somewhere that 2 different batterys would draw off each other an drain each other out

 

[mylows10 5,000+ posts]

k. thanks. i was just wondering because i read somewhere that 2 different batterys would draw off each other an drain each other out

they can .just wanna have the voltage as close to each other as possible

 

[dlg3413 10+ year member]

alright. thanks man

 

[PSturmer 10+ year member]

many people run two different types of batteries. if it doesn't happen what will happen is the battereis will go dead after some time. you can alwasy buy 1 battery, try it, and if this does happen then buy a new one up front too.

 

[i2ain2thunder 10+ year member]

Any person good with batteries will tell you not to use non-matching batteries, as one may hurt or constantly drain the other, or affect the resting voltage. I've done mismatched before and it worked out alright, but it is a general rule to be followed to use the same brand/model/make/size. In order to wire them in parallel simply connect the + on one to the + on the other. The - can be done 2 ways, 1 is to connect it to the other -, the other is to simply ground it to the chassis like the other one.

 

[Fattony911 10+ year member]

youtube has some good videos for installing multiple batteries as well fyi

 

[Full Tilt 10+ year member]

I'm thinking about throwing a second battery in my trunk to begin my new build. Instead of running a decent battery with the POS I have under the hood, I'm gonna try to buy two decent ones. I saw an ad that I could pick up a Shiruken BT45 and a Shiruken BT20. Are these decent batteries to run? Would they be okay together, or would their size difference create some issues?