I would say this is the best response. A healthy battery should not stop after 10 minutes of playing the radio in accessory mode. More than likely the battery was on it's last legs.
I agree.
Most owners seem to be oblivious about their starter batteries in their vehicle until the vehicle fails to start. Then they complain when their battery goes suddenly dead on them after 2-3 years of no testing, no routine maintenance checks, and never topping up wet battery cells. That said.. the best "rookie test" of a vehicles starter battery is to put the vehicle in ACC mode.. as that can and will flag a weak battery early and with malice when the vehicle suddenly needs a jump start.
And then we have a circle of owners who remember back when their early 2000s vehicle did not have this issue. Well... an early 2000s vehicle also did not have dozens of different electronic subsystems either (all of which need to kept in a known power down state when you stop your vehicle.. otherwise.. the vehicle needs 30-60 seconds to fully reboot and self-test all the systems every time you start your vehicle).
For current generation CRVs... as soon as you open the drivers side door and climb in.. the vehicle wakes up and draws what appears to be 5+ amps even before starting the vehicle. If you turn it off, and then put it in ACC mode.. it will still draw a lot of power, but how much depends on what is turned on while in ACC mode. The Head Unit may draw an amp or two, but it is actually the power amp that will suck the life out of a battery, depending on what the volume is set to. Same with any fan blowers running as these do suck a lot of power. And then there are cabin lights, and other odds and ends.
I have never bothered to do a full power profile of a gen5 CRV in all modes of the start button or key, mainly because I NEVER leave my vehicles in ACC mode, and haven't for many years. So the following is an informed estimate, not solid numbers from Honda, and in reality it is best to focus on the state of health of the battery rather than what power demands the vehicle might have in ACC mode.
A) Pre-2020, stock batteries in gen5 CRVs were a 410 CCA 51R battery. Generally, these have a stored charge capacity of 30 amp hours when brand new and at 100% state of charge. Upsizing to a premium 51R or a larger battery group (like 24, or 47) will raise this to ~ 40-45 amp hours. You can roughly calculate the stored charge in amp-hours in a starter battery by reading it's reserve charge spec (which is generally specified as minutes of power @ 20 amps drain). Beginning in 2020... CRVS with a 1.5T engine got an upsized battery, a group 47, and specified for use with auto start/stop vehicles.
B) The challenge though is vehicle batteries are often not at full charge when you park them and turn them off. It could be due to a short trip, or it could be due to the vehicle having sat unstarted for week or more unstarted. In the case of Honda and some other brands... they use intelligent charging systems that seek to downgrade battery charging somewhat as a minor fuel economy measure.. and so that factor alone means that many CRVS (and other Hondas) get parked and powered down with less than 100% charge. 80-90% of full charge at parking is NOT unusual for Hondas.
C) from the day you install a new battery, it begins a long slow decline in health.. leading to eventual failure. A persistently under charged battery will decline in health at an accelerated rate. A battery of wet flooded cell design also are NOT maintenance free and as such.. you do need to check and periodically top up the cell electrolyte levels or your battery will simply go dry and fail.
With all of the above taken into consideration... it is unwise to run modern vehicles in ACC mode sitting parked and with the engine powered down. You are just asking for trouble by doing so, and most likely are also essentially shortening the life expectancy of your battery. You can upsize your battery, as well as insure it is kept fully charged when parked at home by using a smart charger/maintainer.. and in doing so.... you can actually overcome the weakness ACC puts on modern vehicles batteries to a good degree.
To give owners some perspective here.... a brand new fully charged and properly functioning starter battery in a properly functioning CRV should last ~ 1 hour in ACC mode.. but even then.. you are literally slowly destroying your battery.... because flooded cell starter batteries want to be at or near full charge all the time... for longest life. Low charge state kills batteries prematurely.
