Here is what you need to do.
1. Fully charge the battery. If your mechanic charges you for that service, go to Autozone or Checker O'Reilly, they will do it for free.
2. Once that is done, get a voltmeter and get a reading on the battery voltage. For example, say you get 12.65 volts.
3. Install the battery into the car. Once installed, get another reading. If the new reading drops more than 0.1 volt, then you have an open circuit somewhere. That has to be fixed, if not your battery will get continually drained every day. Most electric drains that I have seen come from door switches, trunk switch, brake light switch, and believe it or not, improperly installed stereo system.
4. If your reading is good, drive the car back to the store and have them test your electrical system (battery, starter, and alternator). If you have a bad alternator, your battery will last you probably about a day and a half (may be), and you will need to recharge.
Let me know.
Saturday, November 15th, 2008 AT 10:51 PM