67 OTS Battery Amperage (Ah)

[Dan219]

Fellow Jaguarists,

The battery in my 67 OTS died and I need to replace it. To my surprise, I am unable to find any indication or discussion about the correct amperage needed for my car. The sticker on my old battery is long gone so I don't have real guidance to buy the correct replacement. Can anyone help?

[mgcjag]

The Jag service manual gives you that info... Electrical section/battery...huge amount also on the forum..see similar topics below and this viewtopic.php?f=2&t=16642

[MarekH]

Why would you even care? Batteries only start cars and then act to smooth out any voltage fluctuation due to charging and current usage. As soon as the alternator kicks in, it is what powers the car. All things being equal, I'd buy the battery which has the most cranking power.

Ampere hours are only a concern if you want to keep the lights on whilst the engine is not running.

kind regards
Marek

[malcolm]

I found "how it fits" to be the most important factor.

[mtnjag]

A good modern battery will be more amps than the orig spec so ignore orig amp specs.
You will not 'overpower the car. The battery doesn't send amps out, it supplies amps drawn from it.
The more amps in reserve the better.

That said I agree with both posters-Fit and high amps are your goal.
I have the "Better" grade flooded acid group 26 because it is not a huge battery and is an easy fit and has good CCA/CA.

It's an Interstate MT-26R (R is for the +/- Post position). Nice and small, fits easy, decent amps that crank the Eng with no problem, never let me down, quite long in the tooth now. I think 7-8 years old but forgot to clip the date codes.

I don't car about battery originality so I run a modern battery. Personally I'd stay away from the big hulking Group 24 or similar size you have to shoe horn in even though you can get the big amps out of em.

My next battery will be an AGM since they don't gas off as flooded batteries do and a little smaller and lighter too.