Leisure and Auxiliary Batteries Explained
Starter batteries and leisure batteries do different jobs. This guide explains deep-cycle versus starting duty, and where an auxiliary battery fits.
Understand the job
A starter battery delivers a short burst of high current. A leisure battery delivers a lower current for hours, and is designed to be discharged and recharged repeatedly.
Choose the right type
For caravans, boats and campervans, pick a battery designed for leisure or marine use. Using a starter battery for lighting and appliances shortens its life.
Pro tip: Check the charger is compatible with the battery chemistry.
Add an auxiliary battery where needed
Some vehicles use a small auxiliary battery to support start-stop and electronic systems. Replace it with the same specification.
Related questions
What do the Ah and A numbers mean?
Ah is the capacity: how much energy the battery stores. The A figure is the cold cranking current: how much power it can deliver to start the engine. Match or slightly exceed the original specification, and make sure the terminal layout and dimensions fit.
How do I return a battery?
Start a return from the order page and choose the items. Batteries are classified as hazardous goods for transport, so we arrange collection rather than asking you to post them. Keep the product in its original packaging until it is collected.