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1986 930: Battery took a dump; Need a New Battery

Well, after 4 years of ownership, the battery took a dump this week. What is a good battery for the 930? I have a red top Optima in my 914...

Suggestions?



Old 05-23-2013, 04:12 PM
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I am running a battery for a gold wing and I haven't had any issues. I made a little mount for it out of scrap metal I had laying around because I am cheap. Although the battery wasn't cheap it was like $149 IIRC. I bought it at batteries+ and had a 3yr warranty.

It uses existing threaded holes to stay in place.
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84 911 Carrera w/ 930 t/p,efi'd,dizzy free,HFS turbo[/COLOR], 78 930 RoW no option sunroof coupe, 64 Corvette roadster, 71 911T, 73 911E, 67 Bronco survivor. 71 FJ40, 2001 Boxster
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Old 05-23-2013, 04:37 PM
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Interstate - great value for the money.
Old 05-24-2013, 04:16 AM
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Just dont get a full size 930 battery! I replaced my battery a few years ago and looked at the ones in the rccomended size.........holy crap they are huge. I just picked a battery with similar width and height but only about half as long.


Batteries in the 930 seem to last forever. They are away from the engine bay heat and there arnt any modern parasitic draws like an ecu or alarm. My last die hard battery lasted a decade.
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Old 05-24-2013, 05:40 AM
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they are HUGE! they are as big as truck batteries.

i like you adpater plate. i may have to look into making one as either my batt is going bad or i have a drain. been working on my miss ahd not done anything else to it yet.
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Old 05-24-2013, 05:44 AM
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The origonal battery size seems bigger and heavier than it needs to be.
When you remove it you'll see a hole in the batttery tray for the origonal bolt and clamp that holds down the battery about 3 inches back from the front.
Get the less expensive next size shorter length, same width, same hight battery that fits in there using the origonal clamp and bolt and everything works fine.
Costs less and takes a little weight out of the car while leaving a little room in front of the battery for other things is you like.

I use the standard Walmart "Everstart" batteries for my cars and have had good luck with them. I don't thnk there's much difference in quality if there is any and they cost less than others and seem pretty fresh because there's always a little manufacture date sticker on the top of them. I've always found one less than a month old so I guess alot of people buy Walmart batteries and there's a good turnover.
Old 05-24-2013, 08:07 AM
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I haven't had the best luck with the wal-mart batteries. I had 3 of them in 3 different cars and I have had to replace each of them 3 times. They finally said "we are going to just refund your money", they did and I bought different batteries. I have heard good things about the interstate batteries. I'm not sure who make them. I think there are only 3 manufacturers, but I am sure the specs are different to meet their pricing models.
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84 911 Carrera w/ 930 t/p,efi'd,dizzy free,HFS turbo[/COLOR], 78 930 RoW no option sunroof coupe, 64 Corvette roadster, 71 911T, 73 911E, 67 Bronco survivor. 71 FJ40, 2001 Boxster
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Old 05-24-2013, 09:21 AM
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I did some voltage and current tests on the car with the engine on and off with the old battery.

The voltage at idle was 12.5 to 13V. This seems low.

After starting the car and idling, the voltage was about 12.5V and the charging current was around 1amp. I expected this current to be higher.

I don't have experience with the 911 alternator. What can I check or test to make sure the alternator is working correctly?
Old 05-25-2013, 06:22 PM
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OK, I disconnected the old battery and put it on a trickle charger all night. Its terminal voltage went from about 12.5V to 12.3V.

Yep, the battery is toast. Maybe the alternator is ok. I'll put the new battery in and see how it works.
Old 05-26-2013, 04:47 AM
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your battery seems to be bad but your voltage at idle is way off. it sounds like your voltage regulator is toast or your alternator? you should be getting about 14+ volts if memory serves me at idle.. others will chime in.
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Old 05-26-2013, 07:52 AM
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Yeah I thought I should be seeing +13.5V at idle and running.

What are my options for optaining a new alternator? Pelican? Which alternator should I look at?
Old 05-26-2013, 09:48 AM
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Put the new battery in. Battery is from NTB and is branded "Service Central" and made by Interstate.

Started the car and at idle I had 14.00V so it appears the alternator is working. I will keep an eye on this to see if there's something else wrong besides a dead battery.
Old 05-26-2013, 01:17 PM
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I have a 3.5 y/o Optima red top in my 88 and it won't hold a charge and the battery in the 930 is weak so i'll need to replace both. i started the TR6 up Friday after it had been sitting for 6 months and surprisingly the Walmart Battery battery didn't need to be charged.
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Old 05-27-2013, 04:49 AM
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Bosch.

Anything up to 14v at idle is fine.
More than that is no good and generally an issue with the reg and you will cook the battery.
If that was the case you can smell the thing from 20ft and the battery can have a bit of a pregnant look to it.
Good luck.

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Old 05-27-2013, 02:12 PM
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