Lebouef

So after buying a voltmeter the voltage across the battery was down at 10.3V so not good at all! Started the car up and the voltage jumps to 14v which is a good sign that it's charging so I have bought another Bosch S4 battery as it's the same that was in the car anyway and it has lasted quite well considering the reports on here about poor performance and so far so good so hopefully that's a fix! Thanks everyone for all your help.

Thanks guys will see if I can get hold of a voltmeter and take a look. How can a battery be what seems flat one minute and then charged the next though? Surely a battery is either charged or not?

Hi I'm very new to this but reaching out to you because I am loathed to take to my main dealer! Out 400h has been faultless for 8 years apart from the normal wear and tear but since lockdown I have had problems with the aux battery! Now it's well documented that there's a problem with these and was just about to replace when it didn't start again. I took the other car for that journey but and when I came back the Lexus started just fine so it is totally intermittent? I have cleaned up the earth strap but that has made no difference? Any ideas would be great. It may well be a faulty aux battery but it seems strange to be flat one minute then charged 10 minutes later?