Second battery draining first?

[microhaxo 10+ year member]

So i had a thread a few days ago where i bought a nice battery for the rear. Ive had it for two days now and i notice that in the morning when i go to start my car it takes two tries to start it, i turn ignition for a second and it doesn't fire, turn again and she is good.

I am thinking that after driving around listening to music my back battery is drained a bit and when i park and turn off the car the back battery drains the front to recharge?

IS this true?

If it is will there be more problems than what i have already seen or will it eventually get worse?

Do i need an isolator?

I really dont want to have to manually charge my back battery. And i never listen to music with the car off.

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[jco1385 5,000+ posts]

you need a DMM to find out what's up. we need numbers.

what batteries, and how are they wired?

 

[microhaxo 10+ year member]

front battery reads 12.4 back reads 12.6

when car is on both read 14.1 because of alt.

 

[jco1385 5,000+ posts]

ok, so whats the problem with that?

 

[jdawg 5,000+ posts]

i dont think you have a battery problem

 

[01 S 10 10+ year member]

disconnect them from each other, check them in the morning when 1 of them drains. maybe the connection between your starter and battery is weak or bad.

 

[microhaxo 10+ year member]

Well i just put this new battery in like 2 days ago. And before then i had no problem. The problem just started occurring.

 

[jco1385 5,000+ posts]

is everything TIGHT?

you can show good voltage, but when a load is put on a loose terminal it's not gonna make good enough contact to provide for the load.

 

[microhaxo 10+ year member]

everything is tight.. when i play music i get zero dimming and no substantial voltage drops. Its just after a night sitting the car doesn't start like it did before on the first turn, it takes two and that usually means a slightly drained battery in my experience.

 

[jco1385 5,000+ posts]

hrm. i'd let it go. numbers look ok.

 

[microhaxo 10+ year member]

alright, if it does become a problem then i would need to get an isolator and charge the rear batt every once and a while then huh..

 

[jco1385 5,000+ posts]

just keep an eye on it. the alt should keep it up. i've had mine connected for about a year now w/o a hitch. and i don't have an isolator or a relay or anything.

if it keeps doing it, i'd get the rear battery checked/replaced

 

[kaimana 10+ year member]

maybe your starter itself is going bad? What kind of batteries do you have? Maybe it has something to do with the cca's of the batts?? I don't know...just throwing some stuff out there..lol...

Just weird that both of your batts seem to be charged...

 

[microhaxo 10+ year member]

the rear is 650CCA and the front is 650CCA Brand new rear battery.

 

[jco1385 5,000+ posts]

does it click or anything on the first try?