My Renault Zoe needs a new secondary battery - is this normal?

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?

Will charging my PHEV to 100 per cent every day damage the battery?

I have just taken delivery of my Kia Niro PHEV. I have a wallbox charger and intend to top up the battery each night so I have 100 per cent charge for local trips. Will this damage the battery?

Do hybrids lose more money than petrol cars?

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?

What is the battery life on hybrid cars?

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...