So on my 2008 RX Hatch I had an issue where I couldn't hold charge in the battery so I replaced it. Now I have 2 brand new batteries due to having a guarantee on one and ordering a new one as well.

With the new battery the car is draining the battery when sat if I don't drive it for about 4-5 days. If I disconnect the battery all the time I never have an issue and the car will start first time after being sat and I know that with 2 new batteries there cannot be a battery issue. This even seems to happen if I don't lock the car so the immobiliser cannot be the cause. I've made sure all the lights are switched off, and I have nothing plugged into any of the sockets.
I'm not far off just fitting a kill switch on the battery so I don't have the issue.

Reading some other threads, I saw talk of old trackers that can cause this. Where would I find it if I did have one?

The only other thing of note is that I have the factory satnav stereo. I'm tempted to try isolating that but it does mean taking the dash apart to fit an isolator switch there.

Any suggestions would be great of what could be causing it.

Thanks.

!m!

 

You need a multimeter to check how many amps the car is pulling when everything is switched off. Then it's just a case of methodically removing fuses until you find out what is causing the battery drain (the amps will drop when you remove the culprit fuse).

 

Good call. I'll do that. Thanks.

!m!