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Discussion Starter #1
Went to start my 2019 Mazda 3 today and the battery is dead. In fairness, it's been sitting in my garage for a week and it was probably at the dealer for some time as well. With all of the electronics in this car are Mazda's notorious for battery problems?

If so, should I invest in a good portable jumper?

Thanks!
 

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Mazda's are not known for battery problems. With that said, chances are either your new battery is not fully charged or it is a dud. It is most likely not fully charged. I suggest that you get it fully charged. As for the jumper, that is always a nice accessory to own regardless of which car you drive. I also recommend a good portable tire inflator as well.
 

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Discussion Starter #3
Thanks for your help. Is there a particular battery jumper brand or model you prefer?
 

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Thanks for your help. Is there a particular battery jumper brand or model you prefer?
Your situation is odd. The battery should not be dead after one week, month or even 6 months if it's new. Once you get the car started and it's a good battery then the battery will charge itself to full assuming you drive the car long enough. Consider checking any interior lights are on. Possible a bulb is put in and the polarity is causing it to stay on and just needs to be turned around...a lot of cars in general have issues with lights in trunks and hatch backs even when the lights are suppose to shut off by themselves.

I've always considered one of those air compressor/battery charger combos but they are just too big to keep stored in my hatchback with the other things. The charger by itself is much smaller and doable and may consider. I do keep jumper cables in the car and haven't needed them yet except to help my Super get his new Subaru SUV started cuz he left the rear light on in the back.
 

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Went to start my 2019 Mazda 3 today and the battery is dead. In fairness, it's been sitting in my garage for a week and it was probably at the dealer for some time as well. With all of the electronics in this car are Mazda's notorious for battery problems?

If so, should I invest in a good portable jumper?

Thanks!
I suspect its just a bad battery. The dealer had to replace the battery in my car within the first week of buying it. No issues since.
 

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Discussion Starter #7
CTEK is a good brand. I bought a CTEK CT5 Start/Stop charger since my car has istop.
I just saw a few reviews on this, most of which were extremely positive. Is this the one you purchased? [ame]https://www.amazon.com/CTEK-56-158-Automatic-Battery-Charger/dp/B000FQBWCY/ref=sr_1_8?keywords=CTEK+CT5&qid=1556372142&s=gateway&sr=8-8[/ame]
 

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If you don't use your car for a long time, my understanding is that the battery will go into a deep cycle discharge because the BCM and security systems use a small amount of power even when the ignition is off. This type of discharge is the worst type of discharge for a starter battery, especially in the winter. This is the reason boats or recreational vehicles that get occasional usage use deep cycle or marine batteries. These type of batteries can be revived from deep cycle discharge.

The standard starter battery cannot be fully revived from this type of discharge. This is why people connect trickle charger to top off for weekend cars or disconnect the battery for storage.

If you use the car frequently, you won't notice that the battery has degraded, but it progressively will become worse at holding a charge. After all, the starter battery purpose is essentially to start the car. Once started, the alternator largely does the job.
 

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If you have a garage buy a battery tender and hook it up right away when you bring your car home, then periodically or any time you store the car.

In my experience, it takes a day or more to top off a new battery in a car that has been shipped/sitting for a while.
 

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Discussion Starter #13
If you have a garage buy a battery tender and hook it up right away when you bring your car home, then periodically or any time you store the car.

In my experience, it takes a day or more to top off a new battery in a car that has been shipped/sitting for a while.
Thanks for the info. I actually just purchased a CTEK battery tender.
 
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