Dual Battery Options

[Haasman]

Porschenut in Colorado posted this about the U911-50. I think he is right. The price of sealed battery(s) is nothing compared to the damage of a boiled battery.

[merbesfield]

I'm not sure those Interstate batteries are Sealed AGM batteries. I think they are traditional wet batteries. Yes you can get a Sonnenshein sp? Battery, but get out you wallet, they are not inexpensive. Many threads about them. I wanted less expensive options as noted above.

[edmayo]

I agree with you Mark, the interstates are not sealed AGM but rather normal lead acid but with non-venting caps. There is a vent outlet on the side of the battery for you to attach a hose to and direct the acidic fumes overboard instead of on your trunk floor.

[keith]

I have to differ. I am not a fan of the side posts at all. Porsche's original design is a bit quirky but works very well and the battery terminals are well protected if the original rubber caps are present. The side posts expose the positive terminal to possible contact with items in the trunk.

This is why we use/stock the Interstate batteries as well.

[73-T]

This May will be the fourth year on my sealed Interstate U911 batteries. Wet-sealed and no issues. Finally! As long as it is driven weekly they stay charged for the next drive. Fits right and no regrets.

Cheers!

Jeff

[Richardnew]

I've use the U911 in the past and have been very happy with it. The big problem is convincing a dealer that it actually exists.

Richard Newton
Car Tech Stuff

[NorthernThrux]

Honestly, for a bunch of guys who nitpick every non-OEM detail of every car posted for sale, I'm really surprised that people would consider anything other than original Yeah, there are big advantages to modern day batteries, AGM, Lithium etc. But there are modern day engine mount and suspension and radio and other advances too and we don't consider those acceptable, so why are batteries up for debate (on original cars...all others ignore this mini-rant and continue enjoying driving your cars).

The two potential knocks against OEM are (1) price and (2) leakage. Well, price is what it is. You knew that when you picked a Porsche to drive. It was never going to be cheap, even before investors started driving the prices up. As for leakage, the modern, non cut-rate lead-acid batteries are well sealed. The Porsche versions have a vent, and if you actually use a rubber vent hose and run it below the battery box, there should be no issues. Or so says Fred, the master mechanic at my dealership. He's been working on these cars for 42 years, so I'm willing to give him the benefit of the doubt.

I am price conscious too. As I mentioned, when these die, I'll recycle the innards and mount AGM, Lithium ion or whatever clever battery technology appears at that point inside the cases.

Picked these up this morning. At the dealership. They are really ruggedly built. And they fit the car like they were made for it

[boxster03]

price on those P battery's

[jrbennett]

I purchased a pair of the Porsche batteries in August, paid just under $400 for 2 batteries, 2 new ground straps and 2 new + terminals.

Part number for the batteries is 999-611-014-91, price online appears to be between $165-$200 ea
Keep in mind these are empty and need to be filled with acid, my dealer filled them for free (included in the price of the battery)

[NorthernThrux]

Same pricing. Plus tax. Dealer filled for free. They shipped dry from Porsche's PA warehouse in 5 days over Christmas. Not the cheapest, but not insanely priced, given the perfect fit and "properness". The -90 version was a white case I believe, superseded quite some time ago by the black -91.