50% OFF RAC Vehicle Breakdown Cover via TopCashback + FREE battery replace from RAC from £74.24 annually @ RAC

Unless you have an AGM or other expensive battery and you know it's on its way out it's probably false economy.
Normal batteries aren't that expensive and they're regularly on offer.
I once broke down with a faulty alternator on the way to London.
The AA gave me a new fully charged battery and sent me on my way instead of towing me.
It got me to London and back to Coventry before it went dead.
Had to phone a friend to come and give the battery a bit of charge with leads to get me home. Still better than the 2 leg tow that would've taken hours of waiting.

Had 2 free batteries with rac, good deal especially if your battery is old

Battery replacement not available on the £74 package.
You have to pay either £116 or £165 to get it

• Unfortunately, we’re unable to replace batteries that need to be fitted by the manufacturer or dealer – or if the battery has failed due to misuse or abuse.
• Not available for electric vehicles, hybrid vehicles, motorhomes, kit cars, quad bikes, modified vehicles or imported vehicles.
• Only available on vehicles less than 15 years old and with mileage less than 150,000.

(edited)

Just paid Apple £69.99 to replace my iPhone X's battery 😔