Its a Corvette thing. I've owned a C2, C3, & C5 also my friend has a C4 all would eat a good battery in about 3 weeks. The C2 & C3 had ground issues, the C4 & C5 like many newer cars have clocks, alarms, PMC's and seat memory etc, etc that use battery power. If yours dies in one week it sounds like a weak battery. When you put a new one in and plan on storing the vette for 2 weeks or more get a mini-charger.
G/L

 

So what equipment does a Corvette have that an Escalade doesn't? Or an LTZ Suburban or Tahoe? There should not be any more drain on the system than those SUVs.

 

All C5s came with-an electric "Seeing eye"--You wont find it but it takes juice and keeps your corvette secure from thieves

 

Batteries, any of the automotive types last from a few weeks old to seven or eight years. I have a Optima Red Top and I have a really good float charger for it. The batteries have a parasitic 20Ma drain. So when I know I'm not going be using the car for a few weeks, I lift the hood and hook up the float charger and close the garage door. I never had a problem. But I know that if push came to shove, the Optima could go 2 or 3 weeks, but not much more. If you look after the battery, you won't have any problems.

You need to find out what the heck your amps or radios and or any monster wiring is sucking all the juice out of the battery. The C5 in stock configuration has a 20Ma draw, which is really very small and you'd never notice it if the cars started and run everyday. Look your electricity drain is. I'd disconnec everything that isn't stock. And start adding one more amp or whatever music radio or stereo hooked up. You should see that one or more is a bad or heavy draw on the battery. Measure it with a meter hooked up. Once you find it it should show up on the meter and you'll find that what it is gounding out on. Good Luck !

 

If you have a good battery, you should be able to go a few weeks of not driving without having any problems. The C5 has an electrical draw on the battery even though the car is not running so it will eventually discharge the battery if left sitting long enough.

Not all cars have the fuel sending unit problem, but it is a common issue with the C5s. A good preventative measure is to run a bottle of Techron in the gas every now and then to help keep the sulfur deposits from building up.

 

I have a 3 year old DieHard Platinum P3 that's been drained a couple times over the winter from sitting too long (4+ weeks). Drained soooo badly, you can't even open the door with the remote & weird electrical things start to happen.

We've trickle charged it each time (for weeks) and it's back up to 13-14volts - but It's still sluggish to start.

Perhaps we should've had the trickle charger on it the entire winter to save the battery? I'll probably take it to Sears for a load check.