I changed the battery, and fully charged it. The car ran fine. The voltage stayed around 13V while driving. The next day, the car has trouble starting after like 12-15hrs. It did start, but seem having trouble like the battery was without juice. After driving awhile, the battery seem to charge up a bit, and starting the car was ok. The problem is when I leave the car overnight. The battery will keep draining.

Also, I noticed that after I locked my car, the LED on the door lock blink about 20 times before turning it off. I checked the manual, and it said there might be some fault. Anyone has this problem before? Any solution?

 

How old is that battery? Have you taken the battery some place to get it tested? Have you checked the acid levels? That is where I would start. The summer heat and winter cold kills batteries every day.

 

Parasitic drain. Just been there done that. Most likely your trunk or hood light is staying on, but the way to test it is take a multimeter and connect one end to the negative battery cable and the other to the negative battery terminal and see what the reading is in milliamps. Meter between the two. Normal draw after the car is turned off for, something like 20 mins is 30ish milliamps and no more than 50. The meter will read either pos or neg., it does not really matter, you will get a reading and that is your drain. Then start pulling fuses to see which one makes the amp draw decrease the most. Your door will be open, so when you pull the door light fuse, that will show a drop. Sometimes that light is the culprit also, however, but rule out everything else. Common problems are trunk light stays on, hood light stays on, door lights stay on, ignition is not contacting all the way off, so the car thinks the ignition is on, the rear spoiler gets a leak and causes a short, the starter solenoid can cause a drain, and there are others, I'm sure. My problem was my factory alternator had a short inside that was drawing 135milliamps and the battery drained in about 6 hours. Sometimes the alt grounding strap gets loose or corroded and causes this problem too. If you have just installed an amp or new stereo, start there first. Hope you find it with the fuse pulling method. If that does not find it, then you just have to start checking grounds everywhere. Good luck.

 

Oh, the glove compartment light is another issue from what I have read when I had this problem. You can just remove the light bulb for a cheap fix if you do not want to start digging too deep. Hope it's an easy find. A way to check the battery is just charge it fully and test it 24hours later. With it out of the car and not on pavement/concrete. It should be around 13.5 volts, but not 100% sure the exact voltage. You just do not want to see a big drop. Autozone can check your battery for free, but I've seen them lie to people b4 so they would buy a new battery. You can look at the readouts yourself and it will let you know. LOL true story.

 

Thanks for the inputs. I will start checking with a multimeter.

 

Turn out it was a defective new battery from Walmart. Now I got Interstate.