I went to our local RC helicopter club on Sunday and when I came to leave after 5 hours the ffrr was dead! When the battery was checked, it read 4.8 v. The battery was fully charged and in good condition when I arrived, I have parked the car for a similar length of time many times without a problem but this time I left the key in the ignition which I have not done before. Has anyone heard of this happening before? We jump started the car and I put it on the ctec when I got home and it has been fine today.

unless you take the key out the FF is still awake and running the battery down.. ... - .- -.




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As Stan said  2020 Porsche Panamera Turbo Hybrid (V FAST)
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There must be a fair current draw to flatten a battery in 5 hours! Won't do that again.

Amongst other things, it will be energising the relay that releases the steering lock when the keys are inserted.

Leaving key in ignition is very bad for battery drain.

 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport