Somewhat Confused

[argenis69 10+ year member]

Hello Guys, Last week I disconnected my trunk battery and took it home to do the bi weekly scheduled trickle charge maintenance. So I've left it at home on the charger a few days and I've been lazy to go put that battery back in the car. But during those days that the car was without that secondary battery, I've noticed that the voltage is dropping less than it was with the secondary connected, even at loud bass/volume.(My system is completely described in my signature)

Why is this happening? Isn't it supposed to be the other way around?

Thanks in advance.

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[bgowdy 5,000+ posts]

Hello Guys, Last week I disconnected my trunk battery and took it home to do the bi weekly scheduled trickle charge maintenance. So I've left it at home on the charger a few days and I've been lazy to go put that battery back in the car. But during those days that the car was without that secondary battery, I've noticed that the voltage is dropping less than it was with the secondary connected, even at loud bass/volume.(My system is completely described in my signature)
Why is this happening? Isn't it supposed to be the other way around?

Thanks in advance.

may want to check that secondary battery. it may kind of weak or dropped abit in the time that you didnt reinstall it

 

[argenis69 10+ year member]

How to check that?

 

[phemps 10+ year member]

How to check that?

Multimeter set to dc voltage. To see if the battery is good you want to do a load test though

 

[azmcrae 10+ year member]

Most auto parts stores have a load test for batteries that they will perform for free.

 

[argenis69 10+ year member]

I checked the battery and after charged and disconnected for a while it reads below 12v. Will this cause that problem of more voltage drop with the secondary battery connected?

 

[mylows10 5,000+ posts]

I checked the battery and after charged and disconnected for a while it reads below 12v. Will this cause that problem of more voltage drop with the secondary battery connected?

yes if the battery is below 12 volts ,its bad

 

[phemps 10+ year member]

I checked the battery and after charged and disconnected for a while it reads below 12v. Will this cause that problem of more voltage drop with the secondary battery connected?

That batts done for

 

[argenis69 10+ year member]

So, that means for now, I'm best without using that battery?

 

[phemps 10+ year member]

Yes its just putting extra load on your alternator as it is

 

[argenis69 10+ year member]

Thanks. And does anyone have had experience with a Duralast Platinum H7 AGM battery? It's it worth buying? Will it support heavy loads like those optima, kinetik, xs power batteries?

 

[2Dcore 10+ year member]

Yes, don't put it back in. time for new. it will keep trying to charge but not hold a charge, it's doing more harm than good.

 

[Side Show 10+ year member]

get two new batts and fit at the same time, take out the one that's still working and keep as a spare

 

[argenis69 10+ year member]

Does anyone have had experience with a Duralast Platinum H7 AGM battery?

It's it worth buying?

Will it support heavy loads like those optima, kinetik, xs power batteries?

 

[argenis69 10+ year member]

??