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Thanks everyone for your comments and concerns! After disabling "dual mode" with a FlashPro, I get steady voltages of 14.6 to 14.8 V when the car is running. (And no more flickering!) That might be a little high, but after driving for an hour I looked at the battery, and it wasn't hot or...

I had Advance Auto test the battery. They said it's good. I use an aftermarket audio amplifier to drive my front speakers and an 8-inch subwoofer. With the car turned off, the audio amp draws 3.5 milliamps. The amp powers on as soon as I start the car, but if I have audio turned off at the...

I started the car with the audio system turned off, and the lights still flickered. This evening I pulled out the fuse for the audio amplifier's power cable; we'll see what happens in the morning. I had Advance Auto test the battery. They said it's good. I've ordered a FlashPro so I can...

I have just become aware of Honda's "dual mode" charging. Is that potentially an issue?

This morning the battery was at 12.7. I started the car and turned on the headlights. At first it was reading 14.4, but then the headlights started flickering, and the meter was swinging between 12 and 15. At one point it held steady at 11.9 for a few seconds, then resumed vacillating. The...

I checked it again after a few hours, and the battery had dropped to 12.8. I suppose that's still "normal". I started it, turned on the headlights, and measured 14.5 while idling. I didn't notice any flickering this time. I'll check it again in the morning. Hopefully I can get a reading...

I just checked the battery immediately after driving - 13.2 V.

Sometimes when I drive my 2013 Civic Si sedan, the headlights will randomly dim then get brighter, vacillating between bright and dim. I believe it happens to both headlights simultaneously. I don't think it's related to hitting bumps in the road. It happens only when the car has been sitting...