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26 Size Battery for Thames 300E?

 
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BigFred



Joined: 30 May 2013
Posts: 60
Location: New Jersey, USA

PostPosted: Thu Apr 03, 2014 4:42 pm    Post subject: 26 Size Battery for Thames 300E? Reply with quote

I'm finally getting back to my 1959 Thames 300E project after life & weather got in the way for a while. I'm getting ready to do a test fire-up (first one for this vehicle since the 1970's) and need to buy a battery. I can get a good deal on a new size 26 size battery with 525 CCA's. I'm not at all familiar with this small battery size (a bit smaller dimensions than a 24 size battery) and was wondering if it would suit my purpose. I don't yet really want to invest big bucks in a battery for a project that may not go anywhere. Can anyone help?
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Brett Wilkie



Joined: 16 Sep 2012
Posts: 1081
Location: Vancouver British Columbia Canada

PostPosted: Thu Apr 03, 2014 10:27 pm    Post subject: Reply with quote

I would say it should be okay, I am guessing that you won't be using your car in cold winter conditions anyway?? I have been using a slightly bigger battery in my Prefect without a hint of trouble. If your posts are in the correct position and your connections/grounds/starter motor are good you should be fine.

My battery


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JAN



Joined: 21 Oct 2007
Posts: 125
Location: Wigan, UK

PostPosted: Fri Apr 04, 2014 1:25 am    Post subject: Reply with quote

The battery's size merely dictates how long it can continue to deliver a given output. The 100E is, or should be, very good at starting so doesn't take a lot from the battery.
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peteleo



Joined: 24 Aug 2008
Posts: 879
Location: San Mateo,California

PostPosted: Fri Apr 04, 2014 2:56 pm    Post subject: Reply with quote

Physical size has nothing to do with battery capacity rating.

Auto batteries are rated by AH, amps per hour, and CCR, cold cranking amps. Battery needs to get a high CCA rating no matter the size.
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DonG



Joined: 26 May 2010
Posts: 102
Location: Tilton, NewHampshire

PostPosted: Fri Apr 04, 2014 7:42 pm    Post subject: Battery Reply with quote

Yah, 12 volt is 12 volt. This is one time bigger comes up short. However needs to be Positive ground.
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JAN



Joined: 21 Oct 2007
Posts: 125
Location: Wigan, UK

PostPosted: Sat Apr 05, 2014 1:31 am    Post subject: Reply with quote

If we're getting technical, the Amp Hour rating is useful only as a comparison between batteries output. Theoretically, a 40 AH battery will put out 40 amps for one hour or one amp for 40 hours, which doesn't work in practice. The Reserve Capacity is more accurate, and is the time in minutes that the battery can deliver 25 amps at a temperature of 25 degrees until the battery is fully discharged, i.e. its voltage drops to 10.5.

But generally speaking, the bigger the battery of the same type, the greater its capacity.
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peteleo



Joined: 24 Aug 2008
Posts: 879
Location: San Mateo,California

PostPosted: Sat Apr 05, 2014 10:08 am    Post subject: Reply with quote

Jan,

Don't know where you are getting your info from. You may want to check this out esp. under CCA: http://www.carsdirect.com/car-maintenance/car-battery-capacity-understanding-amp-hour-and-cca

Pete
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JAN



Joined: 21 Oct 2007
Posts: 125
Location: Wigan, UK

PostPosted: Sat Apr 05, 2014 11:15 am    Post subject: Reply with quote

Maybe things are different in the States, but that's how we do things over here. It's what I've been teaching for the last fourteen years!
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BigFred



Joined: 30 May 2013
Posts: 60
Location: New Jersey, USA

PostPosted: Sat Apr 05, 2014 12:37 pm    Post subject: Reply with quote

Thanks for all of the feedback and link. I think I'm going to get the group 26 battery. I'll look into getting a higher quality (and larger dimension) battery later if it looks like this Thames will someday be roadworthy.

Regarding the "needs to be positive ground" comment, isn't that just a matter of ensuring the battery cables are on the correct posts (i.e., ground cable on the positive post)? I did see that they offered the posts in both configurations (positive at one end on one model and positive at the other end on the other model {designated "R" for reversed}).
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DonG



Joined: 26 May 2010
Posts: 102
Location: Tilton, NewHampshire

PostPosted: Sat Apr 05, 2014 7:09 pm    Post subject: Positive Ground Reply with quote

Big Fred, If you have got all original equipment in the van then it will be positive ground as the manufacturer set it up that way. so attach plus to plus and neg to neg. But keep in mind if you want to run down to walmart and pick up a radio you will probably start a meltdown (fire) in your new radio. All American cars are neg. ground. FYI. Dong.
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BigFred



Joined: 30 May 2013
Posts: 60
Location: New Jersey, USA

PostPosted: Sun Apr 06, 2014 10:33 am    Post subject: Re: Positive Ground Reply with quote

DonG wrote:
Big Fred, If you have got all original equipment in the van then it will be positive ground as the manufacturer set it up that way. so attach plus to plus and neg to neg. But keep in mind if you want to run down to walmart and pick up a radio you will probably start a meltdown (fire) in your new radio. All American cars are neg. ground. FYI. Dong.

Yeah, for now I am thinking of keeping everything 100% original. So it'll be positive ground with no electronic accessories.
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BigFred



Joined: 30 May 2013
Posts: 60
Location: New Jersey, USA

PostPosted: Sun Apr 06, 2014 6:29 pm    Post subject: Reply with quote

Minor update... I installed that Group 26 battery with the 525 CCA's. I gave the starter knob a few quick pulls, the starter did engage the flywheel, and the flywheel did turn a few revolutions. (I have the transmission removed and the panel around the shifter removed, so I can see the starter shaft and the back of the flywheel from the driver's seat.) That's as much as I wanted to do at this point. Looks like this battery will work fine for now. I'll now be prepping the rest of motor for the test fire-up. Maybe in the next few days.
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DonG



Joined: 26 May 2010
Posts: 102
Location: Tilton, NewHampshire

PostPosted: Mon Apr 07, 2014 6:07 pm    Post subject: first startup Reply with quote

Big Fred, Just a reminder to put oil in the cylinder tops before starting since its been sitting around so long. Also, if your anywhere near NH, I have some extra parts.
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BigFred



Joined: 30 May 2013
Posts: 60
Location: New Jersey, USA

PostPosted: Wed Apr 09, 2014 10:45 pm    Post subject: Re: first startup Reply with quote

DonG wrote:
Big Fred, Just a reminder to put oil in the cylinder tops before starting since its been sitting around so long. Also, if your anywhere near NH, I have some extra parts.

Already squirted Marvel Mystery Oil in the cylinders a couple of times. Motor turns relatively freely using the hand crank. I live in southern New Jersey.
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