My 2021 Mazda3 battery was out of juice in only 16,000 miles. It was under warranty and replaced by a Mazda dealer. The service department told me it was because of all the electronics the cars have these days.
I'm not really buying that because one of my other car's is a 2019 Hyundai and has the same features as the Mazda3 and it's battery lasted almost 5 years before replacement.

Has anyone else had these issues? I have noticed that the Mazda takes about a second longer to start than all my other non-Mazda vehicles which start pretty much instantaneously after pushing the start button Is this slow start common in Mazda's?
Thanks

 

Ok so not sure why you were told that, and you are an exception to the rule regarding your other vehicle and battery life?
Your problem should be monitored by you and if you have any problem go to the dealership. Your case is isolated and asking if other have had this problem would only give opinion and seldom if ever real tangible or data to state it is any problem with a model MAZDA currently in production over the last 7 years.

But to answer your question based on empirical and empirically found information there is no MAZDA 3 in 2020,2021 that has a battery eating problem! No TSBs or even personal reference with our service records showing any unusual battery short life other that the normal ones. Batteries seldom last more than 3-5 years anymore on most all platforms. The only way to help prevent a battery from needing replacement sooner than you would expect is to check the battery at least every 6 months specifically before winter and then before summer. Have the battery load tested at least once a year. These 2 suggestions can vastly reduce you chances of a no start engine and needing roadside assistant because of a failed battery.

I might add your battery that was replaced in your Mazda, you have no idea how old it was, and you have no idea about the use of the battery while it was on the sales lot of the dealership? For that matter you also have no idea unless you looked personally if it was even a Mazda battery.


Welcome to the forum

 

"The only way to help prevent a battery from needing replacement sooner than you would expect is to check the battery at least every 6 months specifically before winter and then before summer. Have the battery load tested at least once a year. These 2 suggestions can vastly reduce you chances of a no start engine and needing roadside assistant because of a failed battery."

How does this prevent the battery from needing replacement?

 

It gives an indicator of the state the battery is in. Just because the battery passes a load test is only one part of the reason why you do a load test on a battery. If the load testing, follow ups shows a drop in base line voltage or static voltage after charging prior the load test then likely the battery is not getting enough charge in-between use and the battery. If this were to happen, I would look at the battery terminals and the connecting area at the ground and at the starter to make sure they are clean and have good contact. I also may likely would recommend using a battery tender once in while (1-4 times minimum per month, best more often) will help reduce the decline of a battery and thus preventing an early battery failure and replacement needed. In this example.
Contrary to the widespread belief that newer vehicles don't need all this small kind of attention. Look at it this way when the warranty is up on different areas of the vehicle it is your money now to spend to first get a shop to look for the issues and then to purchase a part and have it installed?

PREVENTAITIVE MAINTENANCE is more than the common things and should be considered on less common things like battery maintenance and health checks.

 

My two cents: My battery, even after replacement ( Gold Series) consistently has a ridiculous amount of gross blue deposits build up on both battery terminals.
Twice, I had no power because I had to scrap this crap off the terminals in order to get a proper charge.

After washing and scrapping the terminals with Baking Soda and warm water... ( sounds scary, but totally safe)
cleaning up & removing everything that disintegrated off the posts using a metal brush. Even placing Positive and Negative circular felt red & black colored pads on the bottom of the terminals, I thought might help.. didn't do much just made it look semi pretty for about a month.
It only took build up on the terminals a month or less to return. In mild weather conditions.
There is something terribly wrong with the design... I have no idea what it is.
I keep a multimeter in my car, now.

 

You should have started you own thread about your problem. Mainly it is not related to this thread and the responses here!

You did not give what year and Model Mada you own or the miles?
You may want to include where you live or at least the basic climate information?
The type brand of battery has no bearing on your problem.
Its not the design....of the power supply sytem and cables.
Generally, what you are describing you grounds poor.
The connection is important not only at the battery but at the starter and also on the body/chassis for the ground.