Paralell Battery Question

Tross2023
Tross2023 Member Posts: 77
in Battery/Electrical & Solar
I just got a new to me 2018 TAB 320S
It came w/ a new Interstate battery w/ theses specs

Group HD25-DP, 505 MCA, 64 AH, and 100 RC

I have a line on a second battery, also Interstate for only 79 bucks/new:

It is a: 

Group 24DC Marine/RV, MCA700, CCA 550, and RC140

Can I use them together...can I parallel them, even if one has different specs? 

thanks

Tom 



2024 Hyundai Santa Cruz and 2018 T@B 320S
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Comments

  • ckjs
    ckjs Member Posts: 135
    @Tross2023: Those cannot be used in parallel.  To start with, the first presumably is 12 volts while the second is 24.
    You can safely place identically spec'd batteries in parallel.
    Charles & Judy, Santa Cruz, CA
    2018 T@B 320 CS-S; Alde 3020; 4 cyl 2020 Subaru Outback Onyx XT
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  • NorthIsUp
    NorthIsUp Member Posts: 197
    @ckjs - I think it's size 24 deep cycle (24DC), as opposed to being anything other than 12v.  It's not advised to mix different battery configurations even though both are 12v. They will not charge or discharge at the same rate and one battery can "fry" while the other is still charging. Alternately, one may finish charging while the other is not fully charged. Those are radically different batteries. Your performance will suffer and both batteries will probably die prematurely. 
    Jean & Arnie  Nevada
    2019 T@B 400 BL
    2021 Toyota Sequoia 4WD

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  • Tross2023
    Tross2023 Member Posts: 77
    By the way, the first one is HD24, not HD 25
    does this change your advice?
    2024 Hyundai Santa Cruz and 2018 T@B 320S
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  • SLJ
    SLJ Member Posts: 649
    Tross2023 said:
    By the way, the first one is HD24, not HD 25
    does this change your advice?
    No, you should not mix different types of batteries even if they're the same voltage. (not safe). I wouldn't even mix the same type of battery from different manufacturers.
    2021 T@B 320 S Boondock
    2025 KZ Sportsmen 130RD
    2025 Ford Ranger
    The Finger Lakes of New York
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