Batteries when bought at the right time using relevant promo codes are not a lot of money in the scheme of things.
I normally change them irrespective of whether they are failing or not when their guarantee is up or very close to it.
The old ones normally then get weighed in at my local Recycling Lives centre where i have an account so the money just goes straight into my bank account and this offsets the price of the new ones.
We do a lot of very very remote wild camping when abroad and up in the Pyrenees or Rhone Alps so the last thing i want is the dreaded click,click,click when i come to start the engine when ready to move on.
Similarly the car does not do a lot of mileage ( been parked up since last saturday ) and that has just had a new one at 5 years old.
A Varta AGM, Stop Start
battery bought through Ebay from one of the major
battery retailers, i got 8 X Ebay/Nectar points, 20% off and free next day P&P.
The price to start with was very good anyway so the extra points and 20% off made it even better value.
A neighbour asked about the old Varta
battery which after testing he bought off me for £40 which is more than i`d have got scrap so realistically the new one has cost very little indeed