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What battery should I use for my e30

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    #31
    I agree with a Ctek or one of the other brands of battery maintainers versus trickle chargers. Also, as I understand, the deep cycle batteries are designed for loads then recharge versus sitting for long periods of time.
    2004 525i Manual - 1985 325E Coupe Manual

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      #32
      No battery really likes to sit unused and unattended for any period of time so you are partially correct in that deep cycles are designed to run "house lights" as they say and are separate from your starting batteries. Deep cycles are geared towards higher discharge percentages and more charge cycles whereas if you run a car battery stone dead enough times it will give up the ghost entirely. We use deep cycles on the boat and when on shore power it's on a marine charger 24/7
      Seat Shocks....I have passed the baton to John Christy from Ninestitch. Email John or Garrett at ninestitch1@gmail.com

      https://www.r3vlimited.com/board/sho...86#post4944786
      Alice the Time Capsule
      http://www.r3vlimited.com/board/showthread.php?t=360504
      87 Zinno Cabrio barn find 98k and still smells like a barn. Build thread http://www.r3vlimited.com/board/show...20#post3455220

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        #33
        Nando, I use a 3A Deltran Battery Tender which works great on standard and AGM batteries.

        Good point. They also have Redtops which I believe are starter batteries. The Yellowtop H6 however, has 928CA/800CCA and 140 Reserve Capacity which is more than typical "starter" AGM's and plenty for an E30.

        I pulled this from Optima's site:

        "So if a YELLOWTOP can start a vehicle, why should someone even bother buying a REDTOP? Both batteries have three-year free replacement warranties, so there's no difference there, although REDTOPs tend to be priced slightly lower than YELLOWTOPs. REDTOPs can also provide more cranking amps in a given group size, than their YELLOWTOP counterparts. This might be of importance to someone running a high-compression engine, that needs a lot of power to get started. REDTOPs are also slightly lighter amongst like group sizes, for the weight-conscious crowd.

        While YELLOWTOPs do sacrifice some cranking power, they do offer more reserve capacity in like group sizes, as well as the ability to be deep-cycled. Which battery is right for you? It depends on your application. REDTOPs will work just fine in the vast majority of applications, but if someone is running significant electrical accessories, including winches, large stereos or a vehicle without a charging system (like a dragster), a YELLOWTOP might be a more appropriate choice."

        I scored the Yellowtop for $150 so it was a no brainer for me.
        Last edited by reelizmpro; 04-08-2021, 01:29 PM.
        "I'd probably take the E30 M3 in this case just because I love that little car, and how tanky that inline 6 is." - thecj

        85 323i M TECH 1 S52 - ALPINEWEISS/SCHWARZE
        88 M3 - LACHSSILBER/SCHWARZE
        89 M3 - ALPINEWEISS II/M TECH CLOTH-ALCANTARA
        91 M TECHNIC CABRIO TURBO - MACAOBLAU/M TECH CLOTH-LEATHER

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          #34
          $150 is cheap, they're like double that now! But what are you going to do.. the battery it replaced was also $150 and only lasted a few years. :|
          Build thread

          Bimmerlabs

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            #35
            Never mind - just realized the OP is years old.
            Last edited by cory58; 04-13-2021, 09:57 AM.
            1992 325i Cabrio
            1988 320i Touring
            2000 M5
            1977 530i
            2015 328i - Euro Delivery/Performance Center Delivery
            BMWCCA
            E30CCA

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              #36
              i hate buying batteries and i hate having a dead battery. if a car sits for more than a day or two, it gets the trickle charger, no questions asked. it's a good way to ensure battery health, particularly on a car that doesn't get driven daily.
              Portland, Oregon
              E28M5 | E30S50 | E30M3

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                #37
                I have a trickle charger - but after a few years, still dead batteries..

                Build thread

                Bimmerlabs

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                  #38
                  Interesting this thread has 7k views ..

                  Interstate is great. Surprisingly Duralast gold batteries are quite nice, most all of them have said made in Germany. Im sure a rebranded Deka, but you can warranty out about in every city.


                  I was up above it, Now I'm down in it ~ Entropy - A Build thread.

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                    #39
                    I was not able to get the correct size battery from Costco, it's a bit too tall to fit in the back tray; the lid didn't really fit nice anymore.
                    I'm pretty sure there is more selection in the States though...I would just measure and compare the batteries in the store to make sure it fits.

                    My car sat a lot last winter and so failed to start without re-charging...just took the battery back to Costco and got a new one...can't beat that.

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                      #40
                      Originally posted by finnmole View Post
                      I was not able to get the correct size battery from Costco, it's a bit too tall to fit in the back tray; the lid didn't really fit nice anymore.
                      I'm pretty sure there is more selection in the States though...I would just measure and compare the batteries in the store to make sure it fits.

                      My car sat a lot last winter and so failed to start without re-charging...just took the battery back to Costco and got a new one...can't beat that.
                      They didn't carry the H6(group 48)? It's costco fitment #29 I believe. Costco stock changes all the time. Thankfully, there are 4 of them in a 25 mile radius, so I just called around to find one that had it.
                      "I'd probably take the E30 M3 in this case just because I love that little car, and how tanky that inline 6 is." - thecj

                      85 323i M TECH 1 S52 - ALPINEWEISS/SCHWARZE
                      88 M3 - LACHSSILBER/SCHWARZE
                      89 M3 - ALPINEWEISS II/M TECH CLOTH-ALCANTARA
                      91 M TECHNIC CABRIO TURBO - MACAOBLAU/M TECH CLOTH-LEATHER

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                        #41
                        My 30 sits for a few months a year too and I just keep the brand name “battery tender” on it. The Bosch batt that came with it when I got it is still strong. It is one of the things that worries me though as the years pass. The batt on my e39 went dead as I was bleeding the cooling system after it sat for about a month. Woke me up and now keep power on my cars all the time.

                        I do sympathize with the thread topic. Heck, my Deere diesel tractor sits for 6 months and I just go out there and crank it up and it’s a 2006 model. How do they do it? JD branded stuff is pricey but it tends to be true to OEM expecatations.
                        My son has the 1987 325e, 2 door, 5speed
                        I daily the 1989 325i, 4 door, 5speed

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