Australia: Battery drain problems

[Mkachilli]

Firstly apologies if this has been already addressed, is there any resolution to the battery drain issue.

I have a 6 month old Grenny that drops at least 10% per day - left it on the driveway for four days when I was away with work and could not start it when I got back, even from a jump start pack from the INEOS roadside assist. The key we’re not kept anywhere near the car.
Tow truck back to the dealer and they recharged the battery over a few days. The dealer said they could not find the drain and that the battery was not faulty.

Been carefully watching the state of charge and there is no logic to the battery drop - no switches left on, no loads left on charge, no Wolfbox mirror or any other parasitic loads.

Must admit it’s affecting my confidence in the car.

Have to leave it at the airport for a week next week and I’m concerned what the battery state is going to be when I get back.
Have found the long term storage advice in Rok_dr’s_IG_manual supplement - but it sounds a bit extreme to remove fuses in a brand new vehicle but I supose it is better than being left stranded at the airport.

Any ideas from the community ??

 

[DenisM]

This is a long shot
The public RF band for all manner of "remote" control devices.... weather stations, baby monitors, garage remotes, home automation etc is 433.xxMHz in Australia.

Assuming the Grenadier remote is operating in this frequency band, there may be external RF interference causing the vehicle to be in periodic "constant alert" state. You won't necessarily discover this with normal diagnostics.
You might try locking the vehicle with just the key which doesn't set the alarm. Leave it overnight and measure the drop in battery voltage say after 24 hrs. ...

Years ago I owned a RR P38 which exhibited somewhat similar behaviour. . worse still on occasion I'd hear it unlock/lock continuously for no apparent reason, to the extent it almost burnt out the door lock actuator as well as depleting battery capacity! The culprit was a neighbour's baby monitor 2 doors away. As I recall, the "fix" in this instance was to simply change the operating frequency band via a dip switch on the car's antenna receiver module. The key fob remote apparently accommodated this change "auto-magically" .. end of problem.
As I said . it's a long shot but worth pursuing.
Damned frustrating!

 

[Skydance]

I recently found that trickle charging the battery to full, then disconnect the negative terminal, wait 15 mins and reconnect alters the charging profile. It charges quicker than it drains so rather than 1/2 amps at 70%, it will be 5-10 amps. I find this helps but no one knows why it drains so quickly. I find it drains 1-2% per day on my car.

Make sure, if you’re going to disconnect negative terminal, all the interior lights and dashboard lights, time out first (sleep mode).