Ask Honest John

Most recently answered battery life questions
I want to know if the battery that's fitted to my 2015 Audi is original to the car, as a replacement is very expensive. It does not have an obvious date stamp on the top or sides, but I've been able to...
I have some doubts about the benefit of this facility. Every time I come to a stop with foot held on the brake the engine stops and release the brake and the engine fires up. This means that the battery...
I'm thinking of buying a fairly new used car. Most of them seem to have mild hybrid engines, but I haven't found information on how long these batteries last and how much they cost to replace. As I understand...
Would an eight year old hybrid depreciate quicker than an equivalent petrol only car? And would it be worth keeping a hybrid car close to the end of it's eight year battery warranty?
Should you put grease on battery terminals to protect from corrosion?
I am considering buying a pre reg vehicle which is a 48V mild hybrid / petrol type. There are plenty available with delivery mileage some of which are 22/72 registrations and obviously have been standing...
I have a SEAT Leon, the engine stops at traffic lights etc and restarts automatically when you are free to go. Recently the car does not restart and a message says restart manually. Is this a sign that...
At my 4 year service on a Renault Zoe, I was advised to replace a secondary battery, not the one which drives the engine. The staff could not explain why this was necessary. Can you advise please?
Why does my 2018 BMW 120D Sport (with 21,000 miles) seem hesitant to start on icy cold mornings?
I recently read, to my surprise, the batteries on self-charging hybrids only last about five years. Then the owner has a big bill to replace the battery, that cost thereby negating any bonus they had been...
 

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