Car battery is important to start the car engine. There are some new batteries which claim to last more than 5 years.
There are certain features and points that need to be kept in mind when buying or replacing a car battery
Cold Cranking Amps (CCA)
Climate is an important consideration when buying a car battery.In colder climate batteries with higher CCA is needed than in hotter climates.
The most important consideration is sizing the battery's CCA rating to meet or exceed, depending on the climate, the car's OEM cranking requirements.
In hot climates, buying batteries with double or triple the CCA ratings that exceed the OEM requirement is a WASTE of money. However, in colder climates the higher CCA rating the better, due to increased power required to crank a sluggish engine and the inefficiency of the cold battery. As batteries age, they are less capable of producing CCAs.
Reserve Capacity (RC)
Reserve capacity rating (RC) is measured as the amount of time the battery can stand to provide the minimum voltage required to run the car in case of failure of the alternator. With an excellent reserve capacity rating, the car can run smoothly exclusively on the battery
The two most common types of car batteries based on maintenance are low maintenance (non-sealed) and maintenance free (non-sealed or sealed).
The low maintenance batteries have a lead-antimony/calcium (dual alloy or hybrid) plate formulation; whereas, the maintenance free batteries have a lead-calcium/calcium formulation.
The advantages of maintenance free batteries are less preventative maintenance, longer life, faster recharging, greater overcharge resistance, reduced terminal corrosion and longer shelf life, but are more prone to deep discharge (dead battery) failures due to increased shedding of active plate material.In hot climates, buying non-sealed batteries is recommended because a sealed battery will NOT allow you to add water when required or to test the specific gravity with an external hydrometer.
Sealed Car Battery
Some manufacturers introduced a third type of car battery, "dual", that Combined a standard battery with switch able emergency backup cells. For about the same cost a better approach was to buy two batteries and isolate them.In the future, you can expect to see more expensive valve regulated (gel cell and absorbent glass mat (AGM) .This is because car manufacturers want to extend their "bumper-to-bumper" warranty periods or as the batteries are relocated from under the hood to avoid temperature extremes. For excessive vibration applications, it is best to buy a commercial or AMG battery. Car batteries are specially designed for high initial cranking amps (usually for five to 15 seconds) to start an engine; whereas, deep cycle (or marine) batteries are designed for prolonged discharges at lower amperage. A "dual marine" battery is a compromise between a car and deep cycle battery; however, a CAR battery will give you the best performance in a CAR. For RVs, a car battery is used to start the engine and a deep cycle battery is used to power the accessories. [The batteries are connected to a diode isolator and both are automatically recharged by the RV's charging system when engine is running.
Based on construction, car batteries are of two types
Cranking or shallow Type: This is designed to provide quick energy for ignition and provides a high electric current in a very short period of time.
Deep Cycle Type: This type of battery is designed to provide continuous energy for a long period of time.
Manufacturers build their batteries to an internationally adopted Battery Council International (BCI) group number (24, 26, 70, 75, etc.) specification.
Size of the car battery plays a vital role in car operation and performance. Battery size refers to height, width and length of the battery hidden under the car hood. Every car model is fitted with batteries of different sizes.
It is essential to check the specific battery size in the car owner’s manual. Wrong battery size cannot be fitted with pressure and force. Even if the driver or mechanic is successful to fit the wrong size car battery, it will hamper the entire functioning and operation of the car.
Batteries are generally sold by model, so the group numbers will vary for the same price. This means that for the same price you can potentially buy a physically larger battery with more RC than the battery you are replacing.
Determining the "freshness" of a battery is sometimes difficult. NEVER buy a battery that is MORE than SIX months old because it is starting to sulfate. [Sulfation occurs when lead sulfate can not be converted back to charged material and is created when discharged batteries stand for a long time or from excessive water loss.]
Battery warranties are not necessarily indicative of the quality or cost over the life of the car. Most manufacturers will prorate warranties based on the LIST price of the bad and replacement battery, so if a battery failed half way or more through its warranty period, buying a new battery outright might cost you less than paying the
difference under a prorated warranty. The exception to this is the free replacement warranty period. This represents the risk that the manufacturer is willing to assume. A longer free replacement warranty
period is better and is usually an indication of the quality of the battery. caution: Batteries contain a sulfuric acid electrolyte which is a highly corrosive poison, that will produce gasses when recharged and explode if ignited.