+1

 

I keep mine on a porsche trickle at night, and the car has never not started. I run it around town all day 4-5 starts no problem.
on long trips I take a jump pack for saftey.

 

Tom, I tried to install the same holder that you have but could no get my drill into that small area so I went with the Rennline battery holder. Much more expensive, buy not fabrication needed.

 

That's an impressive weight savings, but that battery has almost no reserve. At least not for passenger car duty.

Half an hour of listening to the radio = likely jump start.

Carry cables! Just make sure they're lightweight ones!

 

Looks great.

What are the downsides to such a small battery?

 

One downside is its lack of reserve capacity. I would not let the car sit for more that two weeks without starting and a quick drive to recharge. I have gone 4 days and the car starts right up.

 

Arent you losing weight from the wrong end?

 

For track use, maybe. But since I weigh 210lbs I need all of the weigh reduction I can get. I am working on the back now (exhaust).

 

I've used pc680s on my previous Z cars and currently on my Supra. They're great in weight savings and cranking amps, but they don't last over 10 days of sitting in a car with a good amount of current draw (i.e. MKIV Supra). Supras are notorious for a high current draw while sitting off. The 996 turns off it's remote door lock circuitry after sitting for a few days to lessen current draw, so it might last a bit longer.

The biggest problem with these 680s is they can only take so many "deep" discharges before they start internally shorting their cells (unrepairable). They just hold less and less charge over time once this occurs. The old versions couldn't even take one deep discharge though, so these have come quite some way. I've gone through about 4 of these 680s so far, but I believe if maintained properly, they're still great.

Keep that trickle charger on there and you should be fine. Either that or disconnect the battery connection when you're done driving the car (as I do now).

 

If I do not disconnect, how long should it last? If 2 years, forget it. I will just buy another one.

 

When 680s are fully charged and disconnected...they can be stored for a long time. I wouldn't doubt they'd be fine after two years with minimal voltage loss.

 

oops. misread your post. you said if you don't disconnect. It depends on how often you drive the car and if you trickle charge it. If you drive weekly and/or trickle it, it'll last 3-8 years from what I've heard.

 

I had it previously on my other car. It died right after warranty period. Towards the end I had to jump my car frequently, stereo sounded bad, etc..

I'd rather take multiple big dumps to save 31lbs than buying another one of these...

 

good luck, i had one in my m3 and it lasted, but I had 2 die on me in the worst possible places (GT2). I then just went with the next size up....no trickle charger, just unplug the car when not in use....

 

When club racing or autocrossing in the summer season my engine bay fan will sometimes run for up to 10 minutes after initial cool down driving/ideling in the pit. Is this battery strong enough to handle the fan going for 10 min inbetween tracking?