ZeroEmissionRequiem wrote: ↑Fri Nov 17, 2023 11:28 pm
EEEE wrote: ↑Thu Nov 16, 2023 10:01 am
Was the test performed with the battery still connected to the vehicle?
Perhaps the batteries that have depleted are a little more resilient than we had expected...
Yeah, both tests were with the battery connected. Should I have questioned this?
Well well...I found my old multimeter, and decided to check the battery voltage myself. I connected it to the battery terminals and ran the cables to the charge port so that I could close the bonnet and thus lock the car properly.
When I unlocked the car and opened the driver's door, headlights turned on, and the voltage semi-slowly dropped down to 12.07 V.
When I powered it on, to ready to drive state, voltage stayed at 14.74 V.
I then shut the car down and locked it, took the key a suitable distance away to keep the car from reacting to it, and the voltage dropped to around 12.50 V or so. It started climbing, however, and 10 minutes later it was at 12.72 V and appeared to stay there.
I then went to the key, started preconditioning, and walked back to the car (still keyless). Voltage was now at 13.62 V, indicating that the 12 V battery is being charged during preconditioning.
After stopping preconditioning, I connected my Defa SmartCharge charger to the 12 V battery, and observed the multimeter. The charger started at 1/5 bars with another bar blinking, as it did before, at around 12.50 V. However
, over a few hours the voltage kept steadily climbing along with more bars becoming lit, all the way up to 14.80 V at 4/5 bars with the 5th blinking. By morning, the charger indicated 5/5 and voltage held at 14.08 V. I turned off the charger, and the voltage dropped to 13.24 V. About 7 hours later it was still 13.12 V! Sure doesn't seem like a battery that's on its death throes.
Even more weirdly, something good appears to have happened to the battery/car during my visit to the dealership, even though they said they only checked the fault codes and ran a battery test (with their Honda-branded Midtronic EXP-1030). Thing is, as I've written, after the battery death the Defa charger couldn't charge the battery even overnight, still indicating 1/5 bars. Also, the only problem I noticed with the car after said incident was with the steering wheel heater; it would warm up as normal, but cool down soon after until it was cool to touch, despite the light staying on. However, after the dealership visit, the battery is accepting charge from the Defa charger, and the steering wheel heater is back to normal as well. Hell, it seems the ambient temperature sensor misbehavior
has stopped, too! I'm also now getting a "it's cold, charger connection recommended" message upon parking, which I don't think I've seen before.