Notebook computer battery is the heart, but also in relation to the advantages of the desktop. Now the majority of notebook battery life mostly in between 2 ~ 4 hours, may not be able to meet users needs. So, for those who need mobile office or frequent walking friends, prepare a backup battery is also very necessary. Furthermore, the laptop battery is kinds of consumables in the use of one or two years will be significantly decreased after the performance, coupled with some users not usually pay attention to battery maintenance work, the battery performance, as well as the rapid decay of the examples of early retirement are not uncommon. How to choose a cost-effective battery is a lot of users eager to understand the problem. This time we will come to talk about the battery purchase.
    
1. Note that the parameters of the battery
 
Laptop batteries A1175 , A1185 , A1189 are not common, users must first understand the purchase of the battery before the battery type to support their own machines. Most notebook computers are used in lithium battery, that is, ordinary lithium-ion batteries. There is also a lithium-polymer battery, but only in some high-end ultra-thin notebooks to use. Li-ion battery is normally provided by batteries A1061 ,A1078 , A1079  Unit to protect the circuit and capacity for monitoring and communications circuit of several components. From the parameter point of view, the battery capacity is an indicator of concern. The current battery capacity is generally between 3000 ~ 4500mAh, but also some with a 6000mAh capacity.

        In theory the higher values in the same configuration using the longer. The manufacturer of the laptop battery has a more detailed description, we often can see the “six-core 4400mAh”, “4-pin 2200mAh” nominal value such as batteries, but in fact is not directly determine the capacity of 4400mAh or 2200mAh laptop working hours. When we talk about computer power consumption, the total nominal power use, rather than simply current. With common 2200mAh, 3.6V batteries A1012 , A1022 , A1060 , for example, could have used some small way the composition of four batteries in series, their voltage is 14.4V, Capacity 2200mAh. Many 14-inch notebook, you might use 2 and 4 strings of 8-cell hybrid mode, the voltage remains at 14.4V, capacity doubled to reach 4400mAh, to ensure a longer usage time. However, the same is a 2200mAh, 3.6V batteries, if we adopt the 2 and 3 strings of 6 cores hybrid approach, its battery capacity it will still be 4400mAh, voltage down to 10.8V, if we just look at capacity, its use of time should be, and 8 the same cell battery. If you press power, then it 8-cell lithium battery, the power should be 63.36Wh, 6 cores for 47.52Wh, 4 cores for 31.68Wh. If according to this value, the advantages of 8-cell lithium  MacBook 13 inch battery , MacBook Pro 15 inch battery  can be reflected.

        Also note that when the battery in choosing the appearance of original battery shell mold generally more standardized, in the loaded laptop will not appear when loaded to take difficult or loosening of the situation; another label in choosing not to buy when the handwriting than the rough and does not clear the battery. In addition, some posing as the renovation of the new battery the battery should also be aware that these batteries electrode traces of heavy general wear and tear, gloss, and a new battery is not.

2. Take a look at the quality of the battery
 
Under normal circumstances, the quality and weight of laptop batteries is proportional to. As the original battery protection circuit are doing more monitoring in place, the quality is better on batteries, so the weight of the assembly of the battery than the jerry-building is much greater when you buy them by hand to try the weight, if the battery lighter than their original number, then need to be aware of. Some time ago, Sony, Dell, Apple, Lenovo and other brands of notebook spate of quality problems, making original apple battery gives a poor impression.

        There are also compatible with the market battery sales, such as “godmobi” series of laptop batteries on the use of original brand of IC chips and high-quality design and manufacture of batteries, not only have all the original battery protection, and stable performance, the use of a rather long time The actual performance and original equipment batteries there is not much difference in the price is much lower than the original battery. So I believe that, if not satisfied with original battery, you can buy excellent quality, brand compatible batteries VGP-BPS9A/B , VGP-BSP13/S , BPS10  .

        At the same time, we must pay attention to those small workshop production of compatible batteries. The internal circuit design of these batteries is extremely simple and the quality of batteries used in more times, and some have even adopted disassemble or brand-name batteries, this battery is compatible with the quality of the natural is not guaranteed. In addition, some laptop batteries inside the original sony battery failure, a number of business through self-change batteries way for original equipment batteries, “life.” However, this battery is no longer true sense of the original battery, and its quality depends largely on how the quality of batteries VGP-BPS5 , VGP-BPS5A .