Do SCs kill batteries like 964s and 993s?

[Kansas]

Just bought my first SC. My other 911s : 964, 993 and 997 all killed my battery within 10 months so I just disconnected the battery between uses. Problem solved. I never cared for battery tenders. Do SCs also kill batteries as well? Because I’ll disconnect the battery on my SC if I need to between drives. Thanks.

[kimlangley7]

the early SCs - at least mine - 1980 SC Euro spec - the only electrical component to operate with the key off - out - is the clock. I have no computer - components talking to each other in my absence. But if you are going to leave it dormant for 2+ months - disconnect neg term../ just my opinion

[Kansas]

Originally Posted by kimlangley7

the early SCs - at least mine - 1980 SC Euro spec - the only electrical component to operate with the key off - out - is the clock. I have no computer - components talking to each other in my absence. But if you are going to leave it dormant for 2+ months - disconnect neg term../ just my opinion

Yes, mine is a 78 SC. It’’ll never be dormant for more than 2 weeks.

[Reiver]

Never had an issue...a radio that saves stations...that's it.

[87maniac]

Less thaN $10

[Flojo]

Originally Posted by kimlangley7

the early SCs - at least mine - 1980 SC Euro spec - the only electrical component to operate with the key off - out - is the clock. I have no computer - components talking to each other in my absence. But if you are going to leave it dormant for 2+ months - disconnect neg term../ just my opinion

mine is a 79, let's call it identical, no issues either.
and since I don't even have a radio my little 45Ah VARTA battery (9,8kg) does a perfect job. 2 years now.

[Quickstep192]

What's wrong with a battery tender?

I have a Noco on mine. It keeps the batteries topped up which prolongs their life and makes it crank fast for quick starts after hibernation.

[Mervo]

My '88, 3.2 batteries last between 5-6 years only.

[MBAtarga]

I've owned my '83 for 20 years as of this May. I've bought 2 batteries - don't recall how long the "original" battery lasted that was with the car when I bought it.

[G450X]

I just replaced my ‘82 SC battery after 10 years (and I don’t know how old it was). I replaced my original 2005 e46 M3 battery in 2019.

I use a tender with quick connections, very easy to use, and I do believe it adds years to the battery life.

[glewis80SC]

1980 no issues with battery drainage.

[Mike Andrew]

My clock will drain my battery to a point that the car won't start in about 4 months without a tender. It will turn over briefly but that's it until I charge the battery. QAD tender has solved that issue and made for a Spring smile when I can just get in and take that first drive with no mucking about.

[Walt Fricke]

If you hook an ammeter into the system with the ignition off, you can see the clock tick - the solenoid pulling the spring tight again. Not much current, though.

Still, batteries self discharge, so a tender is a good idea, and probably better than a disconnect.

[911pcars]

Porsche made battery-killing cars? Hmmm. Maybe an electrical, charging, storage or voodoo issue.

Sherwood

[Bill Douglas]

My 1979 SC's Bosch brand battery lasted about 12 years. No battery tender/charging system, it was just there when I needed it.

I replaced it with the correct sized battery from Supercheap Auto and it died 8 months later. They got a bit snarly when I pointed out to them it had a three year guarantee and please replace it. Haha, after a few kind words on my part they replaced it.