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

228,285

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 out of 1 people think this is helpful.
150,625

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 out of 2 people think this is helpful.
150,625

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

1 out of 1 people think this is helpful.
150,625

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 out of 1 people think this is helpful.

Your Answer

Add photo

Related Questions

  • battery drains out overnight 3 answers

    I got an A/C recharging done by an auto repair shop two days ago. At the time of recharging, the mechanic replaced a new relay in the fuse box at the engine compartment. Unfortunately this morning,m...

    2003 Toyota Corolla CE

    -

    Maintenance & Repair

  • How can I find out a bad relay that causes the battery drain out overnight? 2 answers

    2003 Toyota Corolla CE

    -

    Maintenance & Repair

  • 2012 Toyota Corolla S won't start 1 answer

    3 weeks ago the car wouldn't start. There was corrosion all over the battery and cables. Battery tested bad so I replaced the battery, cleaned and neutralized the clamps and cables and about a w...

    2012 Toyota Corolla S

    -

    Maintenance & Repair

  • car only starts after sitting 3-4 hours 2 answers

    car has been running great. Couple weeks ago was running errands. Came out of store and car wouldn't start. Battery was fine and starter was fine. Left it there overnight, next morning it fired ri...

    2006 Toyota Corolla S

    -

    Maintenance & Repair

  • Battery/alternator/cranking 3 answers

    Car would not start. Clicking sound. Started immediately with a jump. I went straight to AutoZone and they replaced 3 year old battery. Three days later same thing. My mechanic replaced alternato...

    2000 Toyota Camry XLE V6

    -

    Maintenance & Repair

Corolla

Looking for a Used Corolla in your area?

CarGurus has 75,282 nationwide Corolla listings starting at $1,790.

ZIP:

Search Toyota Corolla Questions

Toyota Corolla Experts

#1 FordNut
FordNut
Reputation 16,360
#2 Tom Demyan
Tom Demyan
Reputation 2,330
#3 tenspeed
tenspeed
Reputation 1,790
View All

Related Models For Sale

Used Toyota Camry
881 Great Deals out of 92,136 listings starting at $1,300
Used Honda Civic
510 Great Deals out of 81,592 listings starting at $558
Used Honda Accord
739 Great Deals out of 82,789 listings starting at $500
Used Toyota RAV4
595 Great Deals out of 66,439 listings starting at $999
Used Nissan Altima
808 Great Deals out of 78,287 listings starting at $470
Used Nissan Sentra
488 Great Deals out of 53,947 listings starting at $1,600
Used Hyundai Elantra
514 Great Deals out of 52,485 listings starting at $1,699
Used Toyota Tacoma
540 Great Deals out of 38,026 listings starting at $2,900
Used Toyota Yaris
107 Great Deals out of 13,762 listings starting at $1,995
Used Mazda MAZDA3
216 Great Deals out of 29,549 listings starting at $1,495
Used Toyota Prius
173 Great Deals out of 20,313 listings starting at $1,500
Used Honda CR-V
698 Great Deals out of 57,125 listings starting at $1,600
Used Ford Focus
558 Great Deals out of 55,845 listings starting at $1,495
Used Hyundai Sonata
519 Great Deals out of 50,230 listings starting at $1,300

Used Cars For Sale

2017 Toyota Corolla For Sale
7 Great Deals out of 46,257 listings starting at $13,900
2016 Toyota Corolla For Sale
102 Great Deals out of 6,240 listings starting at $10,444
2015 Toyota Corolla For Sale
154 Great Deals out of 5,903 listings starting at $8,999
2014 Toyota Corolla For Sale
183 Great Deals out of 5,798 listings starting at $8,385
2013 Toyota Corolla For Sale
67 Great Deals out of 1,927 listings starting at $6,899