The chargers are used to charge the battery. You will find many kinds of chargers. The batteries are really worked up when they are used in short trips as especially during the colder times where in you end up using so many things at one time the headlights, heater wipers etc. this all consumes the battery power. There ca be an alternator at work when there is a lot of battery usage and you would need a backup for such times. Make use of the right car battery charger.
How to choose the right one
The charging is super easy and when you have a good charger at hand you would just have to clip on the positive and negative leads to the respective battery posts. The charges that can be given depending on the capacity which is calculated in amp hours which can be full two days or one day. The need to buy the right charger for your battery will be the decision that you will have to make. The decision would be usually the quicker ones get usually picked. But that is not advisable as it would buckle the battery plates. The kind of load put on the battery can be gauged with the number of electrical equipment that run on the battery power is accounted for.
The number of hours you could use of the lights, heater and other equipment will depend on the capacity of your battery. as the discharge happens and comes down, the lights will get dimmer and go out finally, and you know you have fully dissipated the battery power to the very last. The cars that are fitted with dynamo instead of the alternator face such problems, when the battery just gives up on you. The alternator gets charged quickly and does not need high engine speeds to pull out power unlike the dynamo. Make a good choice in getting a good car battery charger.
When you put in the battery charger, there is the need to check the electrolyte level and you will to clean the battery posts before connecting. If a ready made poser point is available, you cold leave your car for charge.