Battery 2000ct

[Rudolph Aaron]

My 2018 ct 2000 

do I need new Battery

when using electric seats etc

it seems to drain Battery

need in winter!

if leave engine running for 10:minutes. Would that cure and help?

Only do short journeys 

 

 

 

 

[ColinBarber]

I'd recommend you never just use Accessory mode when sitting in the vehicle, always put it in Ready mode and let the petrol engine cut in/out as needed. That way the hybrid system is providing the power to the vehicle and charging the 12v Battery.

[Guest]

Yes, as above, keep it in Ready. The system will manage the charging - even accounting for cold winter weather etc. you don’t need to worry if you do that 

[Poundy]

The accessory Battery on these cars is the only fly in the ointment for me and very confusing. When I first bought the car and it had been stood for a week I noticed it would drop to low 12v or high 11v so I took it into Lexus and asked them to fit a new Battery for me, they raised their eyebrows a little but as I was paying did it anyway. 

I have a voltage indicator fixed in the accessory holder and a ctek comfort lead in the boot for easy charging. There was only slightly improved readings with the new Battery fitted.  And now after 5 plus years the readings are usually around high 11v after a few days standing. Lexus health checked the Battery at last service but said it was good to go lol! I also invested in an amp clamp to see if I could find a discharge in the system when off but nothing found, I also have a Battery condition meter which shows it ok but usually in need of charge.

On the plus side with the car off and a reading at low 11v once put into ready mode there is an instant up reading to around 14.9v and after a short drive an off reading of 12.5 volts that again disappears over a few days. Still never let me down and I give it a Ctek treat if it's going to be stood for a while and have a Battery booster pack in the car should it ever be needed and with Battery 6 years old next service will throw another on anyway and go again😄