View Full Version : TR2/3/3A TR3 Battery Size

11-22-2013, 02:53 PM
Hi All

Really simple question for the collective. What size battery (form factor) fits well in the TR3? I'm just going for a simple lead acid battery for now.
For extra credit, what size fits well in a TR-250? (may be a trick question?). I need to purchase both.

Thanks very much


11-22-2013, 03:56 PM
Group 27 was the original size in the TR3, although a lot of guys use the smaller group 24.

Here's a chart with the different sizes. You can just measure the battery well in each car to see what fits.


11-22-2013, 03:59 PM

I use the same battery in both the TR3 and the TR6, so I assume you could do the same for the 250. My thought is, I will never be driving both at the same time, so why have two batteries? There are a lot of different sizes and different ratings you can consider, but be sure the positive/negative terminals are where you want them to be. I went with what was available at the local parts store.


Geo Hahn
11-22-2013, 05:01 PM
Typical Group 24 in a TR3A. About 1 1/4" of space on each side, I have wood blocks in there to keep it from sliding.


A Group 27 would fill the space better, but I went with what I could get at W*Mart.

11-22-2013, 05:48 PM
George who did you get the caps from, and do they push in or screw in?

Geo Hahn
11-22-2013, 07:09 PM
I got those particular caps from a battery recycling shop but that was a few years ago -- hard to find caps on discarded batteries now not to mention the rarity of neighborhood battery recyclers.

On other batteries I have picked up caps on eBay though you have to look awhile to find some that are reasonably priced. If they say 'Mopar' on them or they are correct for a Corvette you can forget about it.

Most recently I got a set that were for Harley batteries: these (https://www.ebay.com/itm/HARLEY-66031-91-LARGE-BATTERY-FILLER-CAP-GREEN-3201329-/370782171869?pt=Motorcycles_Parts_Accessories&hash=item565456f2dd&vxp=mtr#ht_648wt_981).

I had to grind down the threaded portion to make them into push-on caps and (in the case of those Harley caps) had to add a vent hole.


The batteries are so prominent in our cars (and never more so than in a TR) that it seems a shame to have to look at an overtly modern unit, yet I drive the car enough that I prefer an economical and readily available battery from that big W store.

Obviously I have more time than sense.

11-23-2013, 01:53 AM
+1 on the group 24 battery. I've had good luck with batteries from Costco.

Geo, have you added an E type to your collection?

Geo Hahn
11-23-2013, 09:38 AM
...Geo, have you added an E type to your collection?

I have. I began this hobby/infliction 40+ years ago with a TR3 & an E-Type. Seems I am back where I started.

11-23-2013, 09:59 AM
I have. I began this hobby/infliction 40+ years ago with a TR3 & an E-Type. Seems I am back where I started.

May we see it please?

11-23-2013, 11:20 AM
Thanks George on the information for the caps. I looked on ebay and saw a set of Mopar caps for only $135.00, what a deal, to bad the battery wasn't under them.

Geo Hahn
11-23-2013, 12:44 PM
May we see it please?

Sure. Here it is on the Mt Lemmon Hwy (it's first appearance with all body parts installed):


I am still first and foremost a TR guy -- but the E-Type presents a somewhat different technical challenge and very enjoyable ride.

11-23-2013, 01:23 PM
Sweet. I like the look.

11-23-2013, 03:10 PM
Thanks for the useful responses and especially the great photos, Geo.
Much appreciated.

11-24-2013, 11:58 AM
"W" store ditto here for group 24. They stocked them with posts either front or back. No fancy caps on mine, I just pulled off all the stickers.

Looking for a story I'd read on the Coventry to Geneva blast I saw this:
"The E-Type was presented to the world's press at the restaurant du Parc des Eaux Vives in Geneva on 15th March 1961. Such was the media excitement and clamour for demonstration runs up a nearby hillclimb that Jaguar founder Sir William Lyons instructed chief test driver Norman Dewis to drive through the night from Coventry to bring another model to Switzerland. Even Enzo Ferrari admitted it was 'the most beautiful car in the world.'"

Enzo never mentioned it being a "somewhat different technical challenge."