Along with the tyres, the battery for your car is one thing that you will have to replace from time to time as a car battery generally only lasts for about a couple of years. If you do not replace your battery when it is time to do so, it can become both frustrating and worrisome as it gradually capable of holding less and less charge and then eventually will not be able to be recharged. Once your battery has started your car, which tales a great deal of current, your battery is able to recharge itself because the alternator transfers power from the running engine, to the battery which means, once your battery has used some charge it can still regenerate itself so it can power all the electrical devices on the car and still be ready to start the car the next time that it is needed to. Obviously though, if the alternator is not functioning properly, the battery may not get recharged but usually the alternator is okay and it is the battery which is the problem. Of course, if you turned off your car engine nut left your lights on, that will drain the batteries power and so you would have to get a jump start in order for the alternator to be able to once again recharge the battery. Not changing the battery to time though, is probably the biggest cause of a car battery going flat. As the battery ages, it is unable to hold the same amount of charge and will eventually be unable to accept any kind of recharge, rendering it useless. This means that at some time or other you will have to buy a new battery and as there are several to choose from, you will probably want to look at Car Batteries UK reviews\ to see which the best one for you is. The battery that you buy must be capable of providing enough power to start whatever size engine your car has but, at the same time, must be small enough to fit in the space provided for it. Even with meeting these size criteria you will still be left with several options, perhaps different makes and so what you could perhaps look for is one that either has a longer life or, needs the minimum, maintenance or you may even just go for the cheapest. Actually changing the battery is a relatively simp0le task and so you will not even need the assistance of a mechanic as you will be able to do it yourself. Buying a car battery online is a popular choice and if you decide to do that, the online retailer should be able to provide you with detailed instructions on how to change the battery as well as giving you advice as to the right battery to choose for your particular car. So, although the car battery will need to be changed, it is neither a difficult nor overly expensive process.