I'm lighting up the car as much as possible and looking for a lightweight battery. Thought about the Porsche Lithium Ion battery but it seems pretty expensive ($2,395) and only 18 Ah. Weighs 12 lbs too, lightweight but still more than most.

Any brand/model suggestions? I am driving my car daily. I can carry a battery charger that can be used from lighter, but don't like to charge it everytime I leave the car in garage for 2 days or so.

Thanks,

 

$300 for this setup. Not as good as the Porsche product. I use a battery charger that plugs right into the battery.

 

how long can you have the car without starting before the battery dies?

 

I had some good experience with http://www.braillebattery.com/ . Don't leave the car without a trickle over winter or so.

 

You can get both the battery and mounting online. Mounting bracket is rennline and the battery is Odyssey. I have the Battery Tender battery charger and I keep it on the battery when parked. If you drive the car every day, no need to keep it on. If you let it sit for more than 4 days, I would hook up the charger.

 

With a charger, no issues. No charger, one week.

 

Is there any battery which is same spec as stock buttery but weigh less?

 

Robert , why is it that these damn cars kill batteries so fast ? i have to replace my battery once every 9 months or so , and i even arm the car when its not beeing driven... drives my absolutely nuts !!!!

whats the best battery tender/ charger for these cars ?

 

funny, I just noticed this thread, and coincidentally I had to replace my original battery today.

 

me too LOL.

 

Check out Voltphreaks
http://www.voltphreaks.com/

 

I use the Battery Tender Plus 12V battery charger. I always have her hooked up and have not had an issue for three years now with the battery you see in the picture. The 911 eats batteries due to it's large voltage needs even when you set the alarm. I had to replace mine during the first 10 months I owned the car.

 

3 years and 42K miles and original battery is fine. I'm sure it will be dead tomorrow

 

my oem battery lasted 4.5 years. i use a trickle charger when not driving it over a week. when it's in the garage, doors are not locked. pretty normal if you ask me.