One bat at 12.3V second and third bat at 13V Parallel problem?

[timma100 10+ year member]

I asked something similar to this a while back, but I just took a DMM to my batteries. The two I purchased from RAM are 2 years old and both sit exactly at 13V. The brand new everstart my sister bought sits at 12.3V, would I have any problems paralleling all three together? Would the everstart constantly drain my other two? Nothing is installed yet, just trying to avoid problems

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[Buck 5,000+ posts]

The everstart is going to pull your other batteries down. Whenever you have batteries that rest differently, they usually drop down to the voltage of the lowest one. I have 4 batcaps, 1 3k and 3 2k's. The 2k's rest at about 12.8 where the 3k rest about at 13.1. But all together, they rest at about 12.8.

 

[timma100 10+ year member]

The everstart is going to pull your other batteries down. Whenever you have batteries that rest differently, they usually drop down to the voltage of the lowest one. I have 4 batcaps, 1 3k and 3 2k's. The 2k's rest at about 12.8 where the 3k rest about at 13.1. But all together, they rest at about 12.8.

hmmm, so long as I don't explode my everything....

 

[mylows10 5,000+ posts]

The everstart is going to pull your other batteries down. Whenever you have batteries that rest differently, they usually drop down to the voltage of the lowest one. I have 4 batcaps, 1 3k and 3 2k's. The 2k's rest at about 12.8 where the 3k rest about at 13.1. But all together, they rest at about 12.8.

^ this

 

[sacsking916 5,000+ posts]

The everstart is going to pull your other batteries down. Whenever you have batteries that rest differently, they usually drop down to the voltage of the lowest one. I have 4 batcaps, 1 3k and 3 2k's. The 2k's rest at about 12.8 where the 3k rest about at 13.1. But all together, they rest at about 12.8.

this as well as try putting a little charge on the everstart batt. might help it out a little, not saying that will fix your issue but it might bump up the everstart some

 

[Buck 5,000+ posts]

Charge the batteries before you put them. People do not realize how much of a difference this makes. Btw, if that bat is resting at 12.3v and it's brand new, you need to get a refund imo //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

 

[timma100 10+ year member]

Charge the batteries before you put them. People do not realize how much of a difference this makes. Btw, if that bat is resting at 12.3v and it's brand new, you need to get a refund imo //content.invisioncic.com/y282845/emoticons/fyi.gif.9f1f679348da7204ce960cfc74bca8e0.gif

I completely agree, this was my sisters car, and this battery is the fifth one from walmart. The batteries before would drop to 6v when the temp dropped below 30~ degrees. This one starts the car but the starter sounds very under powered. Also they don't own a battery charger, would any charger do? or would I be better off buying a nice one.. (not from walmart)

 

[Buck 5,000+ posts]

Screw wal-mart. No car product should be bought from wal-mart, aside from cleaning **** and oil.

 

[timma100 10+ year member]

Screw wal-mart. No car product should be bought from wal-mart, aside from cleaning **** and oil.

 

[Buck 5,000+ posts]

Can you get a refund?