I think the possibility was suggested on another thread that some cars might have have had a flat battery for long enough during the long voyage from Japan and storage to permanently damage the battery.
This might explain at least some of the cases where problems have occurred. (at time of writing 96% have NOT had any problem) In some cases a new battery under warranty may solve the issue permanently.
I'm surprised Robsterboy's dealer is behaving the way they are. If the battery is ok there is some other parasitic discharge causing the problem. They should find and fix the cause . Maybe that's why they need the car back to monitor the battery. But to be fair maybe Honda have realised some of the warranty replacments were due to owners only doing 950 miles between services and toughened their stance on replacing batteries if the battery rarely got a decent charge in service. Does 'fair wear and tear' also extend to 'unfair' lack of use?
Low mileage infrequent users should also bear in mind the handbook states the High voltage battery needs at least half an hour of continuous driving with discharge and recharge cycles within a maximum of 3 months . If thats neglected the very expensive HV battery may be damaged and may not be covered by the warranty due to driver 'negligence' . Worth bearing in mind for infrequent low mileage users
. Its not enough just to run the car for half an hour on the driveway. It needs to be driven to go through charge and discharge cycles.
Also bear in mind that 12v batteries going flat can be a problem in ALL modern hi tech cars,, especially those that are permanently transmitting to keys, phone signals internet etc., Even a 'normal' car with a full sized starter battery can go from fully charged to fully discharged (and at risk of permanent battery damage) in as little as a month. And may not start in as little as 2 weeks.
Low mileage users increasingly need to take precautions. Bring back starting handles.