The cost of a new car battery in the UK is £50 up to £290, although most car owners will pay at least £80 for a battery, with costs varying by factors like the vehicle—and batteries for. It's worth understanding that most car batteries are nearly identical, providing you're choosing like for like; they come in a wide array of different. DISCLAIMER: The following is intended as a guide only. Different cars can sometimes require different charging procedures, in particular, vehicles fitted with stop/start technology. It's not quite as simple as that. Many different factors can affect a battery's performance and longevity, from environmental conditions through to how the car gets used, or even what type of driving it does. However,. Unfortunately, there is no real way of testing a vehicle's battery without the use of specialised test equipment. Even for driver's that are armed with a voltage meter, that will only give you a basic readout of the stored volts,.