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-   -   Inexpensive Smaller Battery for Stored 1979 911SC (http://forums.pelicanparts.com/porsche-911-technical-forum/1053487-inexpensive-smaller-battery-stored-1979-911sc.html)

michaelm101 02-24-2020 09:31 AM

Inexpensive Smaller Battery for Stored 1979 911SC
 
I've owned this vehicle since 1985 and it has basically been "non-operational status" in the last 15 years, starting on occasion and rolling around the local area to keep fluids flowing.

I'm in sunny SoCal and do not require lots of CCA.

Although I keep it on a trickle charger, I have gone through several batteries.

I simply need a battery that'll get her fired up and I don't want to handle those monster sized batteries anymore.

Does anyone know an option for an easy, smaller, low cost replacement?

Thanks in advance!

Sailkane 02-24-2020 09:48 AM

Install a battery cutoff switch...then put in an Odyssey battery. The battery cutoff is the only way you will always have a fresh battery.

911pcars 02-24-2020 09:50 AM

Avoid using a trickle charger that doesn’t know when the battery is fully charged. For full-time charging, use a battery maintainer with “smart” circuitry. Many out there.

Sherwood

michaelm101 02-24-2020 10:33 AM

Quote:

Originally Posted by Sailkane (Post 10762707)
Install a battery cutoff switch...then put in an Odyssey battery. The battery cutoff is the only way you will always have a fresh battery.

Thx. I've been using a cutoff since way back when, and still I find that that the battery requires recharge... and eventually dies of the stresses or draining and recharging...

michaelm101 02-24-2020 10:35 AM

Quote:

Originally Posted by 911pcars (Post 10762710)
Avoid using a trickle charger that doesn’t know when the battery is fully charged. For full-time charging, use a battery maintainer with “smart” circuitry. Many out there.

Sherwood

Thx. I've been using a "float" charger from HFT...Is this the same as a maintainer?

eastbay 02-24-2020 01:22 PM

The standard smaller replacement is a glass mat H6, but I have an even smaller H5 in my Targa and it fits great.

911pcars 02-24-2020 02:02 PM

Quote:

Originally Posted by michaelm101 (Post 10762762)
Thx. I've been using a "float" charger from HFT...Is this the same as a maintainer?

Yes. However, lifespan (build quality) is questionable at the $10 price point.

As for a temporary battery, assuming it’s just for storage, periodic running and budget is an issue, purchase a pre-owned good battery. Interstate usually has a large wall of good used trade ins for $20-$30. If it doesn’t have to nestle into the factory compartment, all the more flexible.

Sherwood

michaelm101 02-27-2020 08:42 PM

Since there are other vintage stored vehicles in the same situation as this one--Would it be a good idea to simply acquire and use a lithium jump starter?

mepstein 02-28-2020 04:45 AM

Battery tender jr. $25 at most flaps or online. Works great.

NYNick 02-28-2020 04:56 AM

I found a 300CCA 12 volt garden tractor battery for $55 at Lowes and used it as a temporary for my longhood. Fully charged and maintained, it should start your car.

froggert 02-28-2020 06:30 AM

I use a battery sized for Harleys. Works fine except when it's super cold which shouldn't be an issue in your case.

Sboxin 02-28-2020 10:16 AM

Quote:

Originally Posted by NYNick (Post 10766907)
I found a 300CCA 12 volt garden tractor battery for $55 at Lowes and used it as a temporary for my longhood. Fully charged and maintained, it should start your car.

Yep . . . we also use a garden tractor battery from Auto Zone in our 911 race car . .
.cheap and cranks the engine just fine - also carry a spare just in case - and easy to
replace at the parts store in an emergency (which we had one race day) . . . but, the
wire connections are small bolt/nut type - not the usual car battery type . . . we also
run the radio, cool shirt pump, trans cooler pump and fuel pumps off this battery with
the alternator charging of course . . .


Regards,
Roy T


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