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  • May 23rd, 2019 11:22 am
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[OP]
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Jul 29, 2005
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Mississauga

Dead battery

Two weeks ago I took my car in for an oil change and asked the mechanic if I needed to change my battery yet, and the mechanic checked the battery and said all was fine... I also didn't experience any problems with the car or starting the car.

Last Wednesday morning I went to start my car and the battery was dead (I didn't use the car for four days prior to that). So I had the battery boosted... All was working well. Today (five days later) I took my car out in the morning, came home in the afternoon. And then when I went to take the car out again, the battery was dead... I had it boosted again but it died again when I tried to start my car again after.

Why was the mechanic not able to see that my battery needed changing? Or what caused it to drain suddenly after the check up with the mechanic?

Also, I'll be bringing my car to the mechanic first thing tomorrow. When I boost my car tomorrow, will it have enough life to get to my mechanic 15km away? Or would it be better to find an auto shop closer to me (there's an Active Green & Ross not too far, but I would prefer to bring to mechanic).
Last edited by Raggie on May 20th, 2019 10:09 pm, edited 1 time in total.
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45 replies
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Dec 2, 2008
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GTA
maybe parasitic draw hello. my parents euro car died after parking for 2 days with new battery. we need to lock door now and tell car to sleep......
[OP]
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Jul 29, 2005
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qaz393 wrote: maybe parasitic draw hello. my parents euro car died after parking for 2 days with new battery. we need to lock door now and tell car to sleep......
I'm not a car person so I don't understand what you said .
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Mar 31, 2008
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What make and model? Recently, 2019 CRV on certain trims had a major issue on that. It was due to a software bug making the computer run all night and thus draining the battery.
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Jul 4, 2004
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As long as the alternator isn't shot, you should be fine to drive this car to your mechanic once you get the battery boosted. You'll know if it's the alternator as the car would quit on you withing a short while of driving.
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Feb 11, 2007
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How old is your car and battery? Did you ever let the battery die (like by leaving a light on or something)?
Have you ever given it a full charge? It's good to periodically charge your battery with a smart charger, especially if you have a shorter daily drive.
That said, since you've drained it so many times now it's probably dead. Take it to Part Source to be tested and just buy a new battery from them if dead.
Deal Expert
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Feb 11, 2007
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How old is your car and battery? Did you ever let the battery die (like by leaving a light on or something)?
Have you ever given it a full charge? It's good to periodically charge your battery with a smart charger, especially if you have a shorter daily drive.
That said, since you've drained it so many times now it's probably dead. Take it to Part Source to be tested and just buy a new battery from them if dead (or walmart/costco if you want a better deal).
[OP]
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Jul 29, 2005
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My car is a 2012 Mazda 3. This is a second battery about 3.5 years old. I thought batteries last about 5 years.. Ive never let the battery die. I have no idea why suddenly the battery suddenly went dead...
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Mar 9, 2007
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Think of the Childre…
maybe check the connectors, could be build-up on connectors.

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Dec 20, 2018
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Raggie wrote: My car is a 2012 Mazda 3. This is a second battery about 3.5 years old. I thought batteries last about 5 years.. Ive never let the battery die. I have no idea why suddenly the battery suddenly went dead...
Almost 4 years old, not that uncommon for batteries to go around that time
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Jun 12, 2007
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Raggie wrote: My car is a 2012 Mazda 3. This is a second battery about 3.5 years old. I thought batteries last about 5 years.. Ive never let the battery die. I have no idea why suddenly the battery suddenly went dead...
Goto any Partsource store. They can test your battery for free while it's still in your car
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Dec 27, 2007
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OP go buy a meter and do some testing
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[OP]
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Jul 29, 2005
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My car is dead, I need to bring it to the mechanic.
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Oct 23, 2008
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Check the connections just to make sure they are tight. Happened once to wife's car. Brought it in for service and it just happened mechanic didn't tighten one of the connections well. Car started & worked for several days and then one day wouldn't start. The jostling made the connection come off just slightly and the car wouldn't start.

If new battery is required, just get one from Costco.
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[OP]
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Jul 29, 2005
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I'll make sure the mechanics check them. Thanks.
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Jun 18, 2008
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Montreal
Raggie wrote: I'll make sure the mechanics check them. Thanks.
Car batteries don't take complete discharge very well. Just doing it once or twice and you've sucked about a year's life out of it as it will not hold a charge like before. Lead acid batteries like to be fully topped at all times, in other words they like to be started and charged every day. Starting your car after 4 days of sitting, you'll be replacing the battery every 3 years. At this point, if it starts and runs after a boost I wouldn't bother spending money on a diagnosis, just get a new battery. If you don't start and run your car daily ask your mechanic to install an AGM battery. They are more adept to not being started for longer periods.
Temp. Banned
Jun 18, 2008
5095 posts
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Montreal
Car batteries don't take complete discharge very well. Just doing it once or twice and you've sucked about a year's life out of it as it will not hold a charge like before. Lead acid batteries like to be fully topped at all times, in other words they like to be started and charged every day. Starting your car after 4 days of sitting, you'll be replacing the battery every 3 years. At this point, if it starts and runs after a boost I wouldn't bother spending money on a diagnosis, just get a new battery. If you don't start and run your car daily ask your mechanic to install an AGM battery. They are better designed to sit without being started and will last longer than a typical lead acid at a higher cost though.
[OP]
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Jul 29, 2005
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ottofly wrote: Car batteries don't take complete discharge very well. Just doing it once or twice and you've sucked about a year's life out of it as it will not hold a charge like before. Lead acid batteries like to be fully topped at all times, in other words they like to be started and charged every day. Starting your car after 4 days of sitting, you'll be replacing the battery every 3 years. At this point, if it starts and runs after a boost I wouldn't bother spending money on a diagnosis, just get a new battery. If you don't start and run your car daily ask your mechanic to install an AGM battery. They are more adept to not being started for longer periods.
I didn't drive for four days cus I was on vacation. The mechanic is changing the battery. That's what I thought as well no point in just getting a diagnostic.
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Raggie wrote: I didn't drive for four days cus I was on vacation. The mechanic is changing the battery. That's what I thought as well no point in just getting a diagnostic.
What's the warranty on the last battery?
You can try to get prorated refund.

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