The reasons for battery voltage drop overnight

Asked by Oct 12, 2015 at 02:42 PM about the 2003 Toyota Corolla CE

Question type: Maintenance & Repair

After about 60 miles driving on the highway, I used multimeter to check the battery voltage, the reading was 12.25. Then I disconnected the negative wire from the battery post.  The next day I checked it agian,the voltage dropped to 10.43.  My battey is only 48 months old VS. 108 month guarantee. What does cause the battery voltage suddenly drop that much?

4 Answers

285,985

Could be one of the cells is failing. Since you have a warranty, remove the battery and have the shop replace it for a new one. If it's a better retailer or auto part store, they will test the battery for free.

1 people found this helpful.

You have a parasitic draw, from something that is either shorted or drawing juice that shouldn't be using battery power. You have a multi-meter, that's good. You need to pull eacj fuse, one at a time from both underhood PDS, (Power Distribution Center) and from the fuse box behind the flip-down coin-holder, which is a real pain unless you are a midget contortionist. It's difficult to access but can be done.

2 people found this helpful.

https://www.youtube.com/watch?v=zdIKNnwEjIs http://www.batterystuff.com/kb/articles/charging-articles/testing-your-battery-for-parasitic-load.html http

1 people found this helpful.

Now, after all that, your 4 year old battery is ready for re-cycling, use the (probably pro-rated) warranty and get a new one, A lead-acid battery warranty of 108 months is 9 years.... only a selling push... no automotive battery will last 9 years except certain conditions and/or fluke, the normal life span of a battery is 4 to 6 years , maybe some will live longer. Most folks will not even have the same car after 9 years and they (the battery seller) knows it, and who saves paperwork for 9 years and can produce that paperwork warranty.... it will just be rejected anyway But use that warranty regardless. Also Now, after re-reading your question, did you re-connect the battery cable overnight or leave it off and the voltage dropped that much? If the Neg-cable was disconnected then it's simply a battery failure and as before, use the warranty, get a new one, problem solved

1 people found this helpful.

Your Answer

Corolla

Looking for a Used Corolla in your area?

CarGurus has 66,738 nationwide Corolla listings starting at $1,449.

ZIP:

Toyota Corolla Experts

  • #1
    Tom Demyan
    Reputation
    2,640
  • #2
    tennisshoes
    Reputation
    1,880
  • #3
    tenspeed
    Reputation
    1,870
View All

Related Models For Sale

Used Toyota Camry
761 Great Deals out of 70,900 listings starting at $1,200
Used Honda Civic
333 Great Deals out of 52,980 listings starting at $1,200
Used Honda Accord
424 Great Deals out of 101,059 listings starting at $1,200
Used Toyota RAV4
425 Great Deals out of 74,147 listings starting at $1,995
Used Nissan Altima
720 Great Deals out of 70,156 listings starting at $1,495
Used Nissan Sentra
457 Great Deals out of 50,802 listings starting at $1,795
Used Hyundai Elantra
423 Great Deals out of 48,041 listings starting at $1,995
Used Toyota Tacoma
439 Great Deals out of 44,078 listings starting at $1,995
Used Toyota Prius
203 Great Deals out of 17,025 listings starting at $1,200
Used Mazda MAZDA3
215 Great Deals out of 25,792 listings starting at $1,950
Used Honda CR-V
479 Great Deals out of 72,005 listings starting at $1,300
Used Toyota Yaris
40 Great Deals out of 2,564 listings starting at $1,800
Used Hyundai Sonata
365 Great Deals out of 49,687 listings starting at $1,250
Used Ford Focus
406 Great Deals out of 76,949 listings starting at $1,195

Used Cars For Sale

2018 Toyota Corolla For Sale
6 Great Deals out of 39,943 listings starting at $11,900
2017 Toyota Corolla For Sale
75 Great Deals out of 4,772 listings starting at $10,990
2016 Toyota Corolla For Sale
101 Great Deals out of 5,761 listings starting at $8,700
2015 Toyota Corolla For Sale
186 Great Deals out of 6,343 listings starting at $7,500
2014 Toyota Corolla For Sale
52 Great Deals out of 1,853 listings starting at $6,900

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.