truth450h

Just to close this, for the benefit of anyone else who might have a similar problem. I took your advice Barry and got this from ebay. (https://www.ebay.co.uk/itm/392875277300 ). Fits just right. Thanks for the help everyone.

Thanks Steve. that is useful to know. Thanks Barry. I thought that might be the case. I will try this out. I had removed the transport bungs before installing the battery but the outlet tube didnt fit the vent on the battery. So i left them open. I need to get some kind of adapter to fix the tube to the vent.

Thank you for the pointer steveledzep. That worked perfectly. I wasnt able to charge the battery for a very long duration. I got a few hours of charging but that didnt work. So i went ahead and bought a new battery and replaced the old one. I found out that the old one was a 2017 vintage so perhaps that was not a terribly bad idea. I got a Hankook AGM battery. (https://www.batterymegastore.co.uk/product/hankook-sa55020-agm-car-battery-uk-part-code-063h/) for 97 £ as the OEM one was much more expensive (close to 197 £ on lexusparts direct). I needed a ratchet wrench to get the 10mm nuts off the battery holding bar. The Hankook doesnt have the same dimensions as the original panasonic battery. Its not as tall. So I put a base at the bottom to raise the height so that it stays tight and firm. there was also a bit of water at the bottom of battery compartment. I think there is properly a gasket leak somewhere with the rear door. Couldnt detect anything obvious. Drained the water and wiped it dry before i put the new battery in. It worked well. As soon as i connected the negative (after i connected the positive) the car's alarms started blaring. Gave me a start! 🙂 I took the car on a 30 min drive (around 11-12 miles) to get the 12v a bit of a top-up and to check if all was well and the settings were retained. Everything looks fine now. 2 outstanding questions: 1. The Hankook AGM didnt have a vent like the OEM battery did. I thought all AGM batteries have vents. I had to leave the vent pipe disconnected. Hopefully this is fine and I havent missed something obvious? 2. With all the work from home situation I might have spells of not needing to drive the car for a week or 10 days sometimes. How often do i need to drive the vehicle to ensure the 12v doesnt discharge ?

Thanks for the suggestion Herbie. I will try that out, weather permitting. If that doesnt work, does anyone know how i could unlock the boot from inside the car so that i can access the 12v battery? I had a quick look and i couldnt detect anything obvious.

Hello all, I tried searching the forums for something similar to my issue but couldnt get an exact match. I was hoping someone could help point me in the right direction. I had left my vehicle parked for 2 weeks while on a vacation and when i came back the vehicle refused to start. The power button was working at this time. It appeared that the battery might have discharged. So i got a portable charger and used the charging point under the bonnet to jump start the car. The vehicle started properly and like a fool, i thought it would be enough to drive it for 20 mins or so to get the 12v battery charged up. I did that and all seemed fine. Unfortunately i had to leave vehicle parked for another 1 week without driving it. This time i saw that the power button did not switch on at all. I tried jump starting as before but the power button remains off and the vehicle doesnt start. What have i tried so far: -the key seems to be charged as i can see a red light blinking when i press the buttons -i tried leaving the portable charger on for 15 mins to get some charge into the battery. -I tied opening and closing the doors and then waiting for 10 seconds while the charger was charging. I was wondering if I should get a new 12v battery installed, would the problem be rectified. (i need to figure out how to unlock the boot door from inside to access the battery). But i am not sure if there is a blown fuse issue somewhere. Its not clear which fuses need to be checked in this situation. Any advice would be highly appreciated.