Question about 2001 Mitsubishi Eclipse Spyder

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Battery keeps going dead

I'll charge the battery, and if the car sits for 3-4 days, when I go to start it, it's dead. The battery is one year old. I brought the car to a shop, they checked the alternator, and said there was no problem with the alternator.

Do you think the problem is a short or bad battery?

Thanks in advance.

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Hello raiderfan520....Have the battery "load tested" this will tell ya if the battery is defective, one bad cell will draw the others down. If it's bad and only 12 months old you should have warranty left. (free replacement or pro-rated)...If your battery load tests OK, then you have an amperage drain going on while the vehicle is parked.
This is called a "parasitic drain"
Make sure no interior lights, under hood, trunk lights...etc. are remaining on. I hope you don't need the following information i'm about to give you, but here are the steps to locating a parasitic drain.....

  1. Remove the negative side battery cable from the negative battery terminal.
  2. Attach an ammeter(this measures amperage) between the negative cable and the negative battery post. wait a few seconds to several minutes for the car to go into sleep mode. i.e. when you make the contact with the test light the cars computer systems "wake up" after a bit of time they will go to "sleep".
  3. If the ammeter is reading over 25-50 milliamps, something is using too much battery power.
  4. Go to the fuse panel(s) and remove fuses, one at a time. Pull the main fuses (higher amp ratings)last. Be sure to observe the ammeter after pulling each fuse.
  5. Watch for the ammeter to drop to acceptable drain. The fuse that reduces the drain is the draw. Consult the owners' manual or service manual to find what circuits are on that fuse.
  6. Check each device (circuit) on that fuse. Stop each lamp, heater, etc. to find the drain.
  7. Repeat steps 1&2 to test your repair. The ammeter will tell you exact numbers. There you go...everything you never wanted to know... I hope this will fixya up...good luck.

    PS...what kind of season are the raiders going to have this year? I'm in LA county and "Manny being Manny" has turned me away from baseball for now.

Posted on May 14, 2009

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Possibly a shorted battery most likely not only after a year.
sounds more like a parasitic drain, something in the car is not shutting off. check the battery first to be sure.

then you can take an amp meter attach it to the positive post. and the battery connector. do not disturb the car.(do not try to start play the radio or anything)for an hour.
attach a amp meter to the battery positive post(red lead) and then attach black lead to positive battery wire clamp. while it is attached.
then remove the clamp while keeping all leads connected. remove fuses till the meter reads zero.

Posted on May 14, 2009

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