Still not sure ? This article aims to demystify the product codes found on your battery.
Anything that says xxAh e.g 50Ah is to do with the constant power output of the battery.
The CCA number e.g. 380cca displayed on your battery is the amount of energy it uses to turn over the car engine.
As a general rule of thumb larger cars with bigger engines use more CCA and more Ah.
What differs between brands, perhaps the most confusing bit is the product code number.
If you are not well versed in car battery product numbers (which most people aren't lets face it) then codes such as 063 Type or S4001, B18, C6 will mean absolutely nothing.
Those codes in the paragraph above are all for the same sized battery albeit the Ah and CCA ratings may vary ever so slightly.
Does that matter ? Generally no unless your car has more than the average amount of gadgetry, in which case you would go for more Ah's!! and not necessarily for a specific product code number.
If your battery is a Bosch or a Varta then finding another is easy on the internet. All that you have to do is search for say Varta C6 and loads will appear. If you are looking for something cheaper then that's when things can get confusing (which is what car manufacturers and chain stores want).
Having read part one of this article - you will know your engine size and have the size of the battery (at least the length and width, the depth may be difficult to measure because the engine is in the way for example).
It's just then a matter of comparing what you find in terms of price by looking at a few websites on a rainy Sunday afternoon. Most have the capability to search by vehicle. The results of different website may however yield different sized batteries which is where it is useful to have peered beneath your bonnet prior to trawling the net.
If, however it is Monday morning and time is of the issue it may be more practical to spend the extra £50 or so having one fitted at a high street chain. Ouch!