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Old 07-13-2014, 10:08 PM   #1
bad
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Checking Battery

I haven't had any problems with my battery but a garage checked my battery without me asking them to and they told me my battery was "dead" as it "was putting out 100 A when it needed to put out 500" ... I'm pretty sure that is what he said. I decided to say no to whatever he was trying to sell me and came home and took a look.

I watched this 2 min and 27 second video on youtube about checking your battery...

http://www.youtube.com/watch?v=tsJUuLu1cw0

... the guy in the video says if your battery goes below 9.6 V while starting it, that it is a bad battery. My battery was at 12.6 V before starting the car and at 8.4 V while starting it. So according to this video my battery is bad. The car had been off all day, but I started it a few times for about 30 seconds at a time about 20 minutes prior to this test. The dome light was probably on while my dad was starting the car. No other lights were on besides the dome light while occasionally opening the door throughout the day, and the high beams for about 10 seconds twenty minute before the test.

Also, I checked the battery water and it is at at the correct level.

Do you think my battery needs replaced and why?

Thank you.
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Old 07-14-2014, 05:08 AM   #2
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The battery dropping below 9 volts while cranking says that you do not have long before it starts to not start when cranking. Overtime the battery's lead plates get coated with sulfate, which reduces their surface area and hence the battery's capacity.
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Old 07-14-2014, 11:00 AM   #3
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stranded

Yes, replace before you are stranded. It will quit at the very most inconvenient time.
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Old 07-14-2014, 11:31 AM   #4
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Quote:
Originally Posted by alanwagen View Post
Yes, replace before you are stranded. It will quit at the very most inconvenient time.
This!

My experience http://www.yarisworld.com/forums/showthread.php?t=43255

My battery suddenly died while on vacation last summer deep in the heart of french speaking New Brunswick and I don't speak a lick of french.
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Old 07-14-2014, 12:31 PM   #5
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s it the original battery?
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Old 07-14-2014, 12:38 PM   #6
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Quote:
Originally Posted by bronsin View Post
s it the original battery?
I bet it is. I bought the car with 50K miles and now it has 100K miles. I never changed it.
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Old 07-14-2014, 12:44 PM   #7
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Thanks everyone. I'll replace it. My dad will be so disappointed in me ... lol.
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Old 07-14-2014, 02:10 PM   #8
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On this same subject, I often leave my car for 4-6 days between being away for work (airport parking lot etc), and I've twice noticed that after starting and beginning to drive, the red battery symbol warning light is on for the first few minutes, sometimes very dim and barely illuminated.

I assume this indicates a low voltage.

So...

standby drain too high?

bad alternator, not strong enough to recharge it?

bad battery? (about 3-4 years old, replaced).
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