When I tried to unlock my HR-V this morning it was completely unresponsive (this was 9 days after a 160 mile trip). Hondacare (=AA) first tested the battery and concluded it needed replacing before doing a jump-start so I could drive the vehicle to the dealer for investigation.
I find (these rather often) complaints disturbing. While mine has behaved well after non-use, now and then, of a week or so, I can't help wondering what the root cause could be. Any ideas?
I think its the long shipping time from Japan ,plus maybe delays at each end . A few cars may flatten their battery for too long and they get damaged. Probably not that many overall, since Honda seem to prefer the cost of replacing a few under warranty, than the cost of keeping them all charged up in transit.
Once replaced with a brand new battery it should restore the status quo.
But the fact remains the 12V battery in virtually ALL new cars are now at risk if its only used occasionally or for short journeys . Unless precautions are taken to keep it charged or to drive it regularly. . Ideally a smart charger, but if thats not possible a solar charger may suffice.
Modern cars have various computer systems, alarms,keyless signals etc running 24/7 which have a big drain on the battery. This is not just a problem with Honda or Hybrids with their relatively small 12v battery. . Even conventional ICE cars with a full sized starter battery can completely flatten their battery in 4 weeks,risking permanent damage , or only 2 weeks down to 50% charge and a reasonable chance of still starting.
I've not had any problem with my EX And I once left it unused for over 2 months in January and February on a solar charger. It started no problem.
I have also taken a belt and braces approach of carrying a small power bank 12v jump starter. They claim to be able jump start an ICE engine so should be enough to power up a hybrid computer system . That remains charged for about 3 months, so I will have to remember to keep it topped up. I hope never to need it ,although it can also be used a usb power bank for phones, cameras etc and as a torch. I also carry a replacement button battery for the keys .