Ask Honest John

Most recently answered battery life questions
What type of stop/start battery is fitted to my Mercedes B-Class and why has it failed? The car is less than three years old and the mileage is 28000.
I am selling my Audi A4 Allroad 3.0 TDI and am trying to decide upon either a hybrid or EV. Is there any data available on the rate of decline in performance of EV vehicle batteries? I note Hyundai and...
I am becoming more interested in purchasing an electric car and at the age of 72 and a low mileage driver want it to last a long time. I imagine that the battery in an electric car is a lot different from...
My Outlander PHEV is three years old and has been an excellent car. I'm just starting to have a nag at the back of my mind about battery life and the consequent cost of replacement. Could I have your views...
What is the best way to maintain PHEV batteries and enable them to keep their charge?
I have a 2018 Alfa Romeo Giulia with 8000 miles on the clock. The car was running fine until the end of October, but I parked it in a garage overnight for around 11 hours and the next morning the battery...
Can I use a battery conditioning charger (I think that’s the term) through a 12v socket in my car’s cabin? Obviously not one wired through the ignition switch.
Is there any information available yet regarding the degradation or actual battery life of the BMW i3? I drive the 94Ah range extender on a (66) plate. I'm really happy with it and would like to buy one...
It seems that an electric vehicle is only worth as much as its battery and, once the battery is "spent" it's not worth the cost of replacing. Is this true?
I bought a five year old Vauxhall Cascada from a main dealer which included a two year NetworkQ warranty. In the first week of using it I reported a number of faults including the ECO Stop-Start did not...
 

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