A diy’er can do a basic voltage check with a volt meter probing the battery terminals. When the car hasn’t been used overnight, and before starting the engine the next morning, the battery should measure about 12.6 volts. After starting the engine , should measure in the 13.5- 15.5 volt range. What does yours measure?
Do you know what caused the battery to go dead the time after work?
I found this in an older post:
_Honda alternator is controlled by the engine computer so it cannot be diagnosed by any one that does not have a computer link to the manufacturer -
It’s correct, but a diy’er can still do some basic diagnosis, as mentioned above. If it fails that test, most likely there is a alternator or battery problem. If it passes the test, good chance the alternator at least is ok.
The conductance battery test is not without fault, you can get different results from a battery after sitting over night. It is unlikely that you are driving around with a failing alternator, your weak battery would allow the vehicle to operate for just a few minutes without an alternator.
Good for you for getting the problem correctly diagnosed and repaired. Best of luck. Auto batteries as reported here rarely last more than 5-6 years, so you got your money’s worth out of that one.