- :
- CX5 GT
It depends.....biggest killer is low state of charge which brings sulfation from frequent low SoC and also second one is water/acid levels dropping below critical.
Although the mazda oem battery is very well sealed and designed + the smart car alternators nowadays rarely charge above 14+V to prevent water escaping at fast pace.
But that brings sulfation on frequent short drives (less than an hour a drive, etc.) and speculatively the battery eventually dies in 3-4 years.
Mine gets to only 85% max state of charge and is sulfated a bit. Also had to put some water even though it wasnt under critical levels. That is for almost 2 years.
Its hard to keep it in high charge nowadays unless you put it on a charger frequently, one that also has regulated desulfation option. Which is too much hassle for everyday users.
Good way I think to estimate when it may start to die is to check water level every oil change and test regularly with a cheap battery tester to see its degradation over time.
Car electronics nowadays has a min voltage under which it wont work.
Back in the days, you could fire up the engine even at very low SoC battery but no more nowadays with all those computers.
A "dead" battery sometimes may just need to be taken out, desulfated if possible and charged properly (not just for 30 minutes but much more) and in many cases can last year or two more.
I have tested quite a few lead acid batteries now, all on new cars 2-3 years old and you would be surprised in how bad state they were. 10+ years ago used to be not normal for lead acid batteries to last 3-4 years but that seems the new norm.
Although the mazda oem battery is very well sealed and designed + the smart car alternators nowadays rarely charge above 14+V to prevent water escaping at fast pace.
But that brings sulfation on frequent short drives (less than an hour a drive, etc.) and speculatively the battery eventually dies in 3-4 years.
Mine gets to only 85% max state of charge and is sulfated a bit. Also had to put some water even though it wasnt under critical levels. That is for almost 2 years.
Its hard to keep it in high charge nowadays unless you put it on a charger frequently, one that also has regulated desulfation option. Which is too much hassle for everyday users.
Good way I think to estimate when it may start to die is to check water level every oil change and test regularly with a cheap battery tester to see its degradation over time.
Car electronics nowadays has a min voltage under which it wont work.
Back in the days, you could fire up the engine even at very low SoC battery but no more nowadays with all those computers.
A "dead" battery sometimes may just need to be taken out, desulfated if possible and charged properly (not just for 30 minutes but much more) and in many cases can last year or two more.
I have tested quite a few lead acid batteries now, all on new cars 2-3 years old and you would be surprised in how bad state they were. 10+ years ago used to be not normal for lead acid batteries to last 3-4 years but that seems the new norm.
Last edited: