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2018 Accord Sport 2.0T 6MT
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There is never going to be a definitive answer for this question. It always depends on battery quality, weather, driving habits. I had batteries that lasted through 5+ NY winters and I've had batteries last through 5+ Texas summers. I've also seen people have batteries go bad in a year or less. Average battery life overall is 3-5 years, thats probably as good of an answer as you'll get to that question.
 

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Mine lasted a bit over a year. I like my 2020 2.0T, but I am also deeply disappointed in car quality. Between the Bluetooth not working, all the rattles and the fact that the battery quit after only 12 months? Yeah, I'm a bit hesitant on keeping this car for too much longer. Probably dump it right when the warranty expires.
 

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2018 Accord Sport 2.0T 6MT
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Mine lasted a bit over a year. I like my 2020 2.0T, but I am also deeply disappointed in car quality. Between the Bluetooth not working, all the rattles and the fact that the battery quit after only 12 months? Yeah, I'm a bit hesitant on keeping this car for too much longer. Probably dump it right when the warranty expires.
Where do you live? and do you run the car in accessory mode without the engine running for extended periods of time? all that can factor in, plus OEM batteries are notoriously bad. Get a good aftermarket with a good warranty and don't let the battery discourage you. Sorry to hear about your rattles, can't say I've experienced any of that in mine. As far as the bluetooth have you had it checked at the dealer seeing as I assume you bought the car new if you're talking about the warranty?
 

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Where do you live? and do you run the car in accessory mode without the engine running for extended periods of time? all that can factor in, plus OEM batteries are notoriously bad. Get a good aftermarket with a good warranty and don't let the battery discourage you. Sorry to hear about your rattles, can't say I've experienced any of that in mine. As far as the bluetooth have you had it checked at the dealer seeing as I assume you bought the car new if you're talking about the warranty?
I live in Arizona. Yeah the heat does slice off life from the battery, but, I've never had a battery go bad after just one year. No, not running the car in accessory mode or anything like that. Once the warranty is expired, I'll definitely look for a good aftermarket one. The car before the Accord I owned for 5 years. Never had to change the battery. But, the dealership did say that the batteries in the 10thgen Accords are awful.

And yes, I took my car to the dealership for the Bluetooth issue. The service department said that as long as the Bluetooth was connecting, albeit 30 seconds to several minutes later, it was considered normal and they couldn't fix it as it was working fine. They even witnessed the lag. The second time I took it in for the Bluetooth, it took nearly 5 minutes for it to connect. The dealership blamed my phone. I've tried 3 different phones over the 1.5 years I've owned the car, and BT connectivity issues across all devices. Maybe when I get some free time I'll bring it to another dealership.
 

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2018 Accord Sport 2.0T 6MT
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I live in Arizona. Yeah the heat does slice off life from the battery, but, I've never had a battery go bad after just one year. No, not running the car in accessory mode or anything like that. Once the warranty is expired, I'll definitely look for a good aftermarket one. The car before the Accord I owned for 5 years. Never had to change the battery. But, the dealership did say that the batteries in the 10thgen Accords are awful.

And yes, I took my car to the dealership for the Bluetooth issue. The service department said that as long as the Bluetooth was connecting, albeit 30 seconds to several minutes later, it was considered normal and they couldn't fix it as it was working fine. They even witnessed the lag. The second time I took it in for the Bluetooth, it took nearly 5 minutes for it to connect. The dealership blamed my phone. I've tried 3 different phones over the 1.5 years I've owned the car, and BT connectivity issues across all devices. Maybe when I get some free time I'll bring it to another dealership.
Yeah, they're not great batteries. Get a good one one and forget about that. The bluetooth thing just sounds like they were lazy. I don't use bluetooth often so I haven't had any issues to speak of. Hopefully somebody can help you on that so you can at least enjoy teh car while you've got it
 

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Yeah, they're not great batteries. Get a good one one and forget about that. The bluetooth thing just sounds like they were lazy. I don't use bluetooth often so I haven't had any issues to speak of. Hopefully somebody can help you on that so you can at least enjoy teh car while you've got it
I'll definitely get a better battery. As for the BT issue, unfortunately there just isn't a solution to. I've scoured the forums, reddit and just about everywhere. The problem will remain unless Honda takes the issue seriously.
 

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'20 Sport 2.0T 6MT, Still Night Pearl. '07 EX-L I4/Nav sold.
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The surprising thing for me is that heat is worse for batteries than cold. (Cold reveals their flaws faster, but it's not particularly hard on a battery unless the battery gets discharged too far, in which case the electrolyte can freeze and destroy the cells. This is fairly easily avoided though.)

Here in Saskatchewan, batteries last about four to five years which is longer than they last in Arizona or Florida, despite our climate being much colder in winter. But our summers are fairly hot, so batteries can last longer elsewhere. I would expect places like Washington and British Columbia coast might have among the longest battery lives since the weather rarely gets too hot there.
 
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