I took delivery of my hybrid in January and initially had no problems. However, a month ago the 12V battery went totally flat when not used for 2 days. I monitored the battery voltage for a few days, but even with a 40mile journey it failed to recover, averaged 12.3-12.5V, and it had to be used daily to achieve that. The charging circuit looks OK as it is providing 14.5V. I took it to the dealer who ( over the period of 36hrs. that they had the car) were unable to reproduce the problem and suggested I recharge the battery. Not very helpful!
Since getting the car back I've tried to isolate the issue, and discovered that the high(er) drain on the battery seems to result from the Smart Entry when
(1) it is near a Wifi transmitter(overcame that by moving the car),
(2) in the rain when the door handles are wet over a long period.
I don't believe there is a fault in this circuit, but that it is applying extra load on the battery and either the 12V system is not up to requirements or the 12V battery is faulty. The first seems unlikely, but the dealer claims the battery is OK(although he has not tested it when disconnected from the vehicle)
Has anyone experienced a similar problem or can anyone suggest anything else that would discharge the battery(I have shut off all interior lights)