Front battery replace

[Oraclem19]

Using a 700 CA battery in back @ somewhere near 50 aH in the rear of the car wired with 0ga, trying to not overload the front old battery and overcharge it as I also have a 200+A alternator.

Would it be possible to replace the front battery with a smaller 15 aH 200 CA battery and be able to safely start the car with that in addition to the battery in back? I have started the car with only the batter in back, mostly am concerned about battery drop at the engine, and blowing up the smaller battery.

Else i'm considering replacing the front battery with a power cell just to get the car started and voltage stabilized and a good amount of amps to start the car.

Logic on this: I don't see any 8 gauge going to the starter, let's say it takes 4 seconds of crank to start the engine. 4 seconds at max amperage for 10 gauge? 120-160A

Accounting for voltage drop to still be able to deliver that, wouldnt a 4-500 CA battery alone work MOST of the time?(CCA not a concern to me. I'm in Arizona, snow is literally a joke here)

I figure if I have 200 amps avaliable at the starter, and near 1000 amps avaliable in ther whole system, should work correct?

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[NASTY08IMPALA 5,000+ posts]

Go to sams and get a duracell agm 99 bucks..stronger than all the batts u have now

 

---------- Post added at 01:57 PM ---------- Previous post was at 01:56 PM ----------

 

Use that to replace ur front battery

 

[Oraclem19]

D1200 in the back and a spare interstate with 900 CA sitting in garage. Looking to lighten weight-clean engine bay, my electrical needs are covered 10x over.

I mean I can play the system for 3 hours while working on the car with only that 1200 attached lol. Just need to know if attaching a 15ah cell to a 45ah cell will blow it up if I try to draw 300 A from it/the 0 ga that will be going over top of it.

 

[NASTY08IMPALA 5,000+ posts]

I ran 290ah worth of batt power on my setup before i got my ho alt and i run 4k+rms ..id say you should be fine.

 

[mylows10 5,000+ posts]

just dont mix battery types

 

[NASTY08IMPALA 5,000+ posts]

Also switch over to all agm batts if u can..or dont already

 

[Oraclem19]

just dont mix battery types

Also switch over to all agm batts if u can..or dont already

This is why the concern. I'm running lead acid in front and agm in back, have a 200 CA agm in garage but wanted to make sure it wouldn't blow-leak from the massive draw of current.

I suppose if I can start the car off a 0 gauge connection only though, should overheat the 0 gauge before the battery is overdrawn.

 

[mylows10 5,000+ posts]

This is why the concern. I'm running lead acid in front and agm in back, have a 200 CA agm in garage but wanted to make sure it wouldn't blow-leak from the massive draw of current.I suppose if I can start the car off a 0 gauge connection only though, should overheat the 0 gauge before the battery is overdrawn.

should be fine ,as long as both are agm

 

[NASTY08IMPALA 5,000+ posts]

Yes ditch the wet cell up front

 

[Oraclem19]

Just did the swap, runs fine. Even 0ga'd the starter cable since it was old and boring looking, 8 ga going to the rest of the fusebox(4ga in the mail)

Fun fact. You CAN start a Honda on

 

[robert420 10+ year member]

the most efficient way i can think of is to just run a standard battery to power your cars electronics normally. then run your system off the back battery. that way the system is on a completely different setup.. thus reducing light dimming etc.

 

[naughtyca 10+ year member]

Go to sams and get a duracell agm 99 bucks..stronger than all the batts u have now 

---------- Post added at 01:57 PM ---------- Previous post was at 01:56 PM ----------

 

Use that to replace ur front battery

the duracell in sams club is that better than the optima yellow top?

 

[NASTY08IMPALA 5,000+ posts]

the duracell in sams club is that better than the optima yellow top?

Hell yes they are made by east penn same as deka

 

---------- Post added at 04:27 PM ---------- Previous post was at 04:26 PM ----------

 

Yellow tops r crap for the money

 

[naughtyca 10+ year member]

i thought optima's are better i got a refurb for $36 with 6 warranty

 

[NASTY08IMPALA 5,000+ posts]

i thought optima's are better i got a refurb for $36 with 6 warranty

Not at all...but for 36 bucks u cant get much