General principles 
First of all, in addition to paying attention to the type of battery, we should also pay attention to the battery capacity and actual use time. In general, battery life is better than 3 hours to meet the needs of daily mobile office. At present, the laptop's battery capacity is generally 3000 ~ 4500mAh, there are very few equipped with 6000mAh capacity. The higher the value, the longer the usage time in the same configuration. 
Second, the quality of laptop batteries must cause consumers to pay attention, because the major notebook computer manufacturers have encountered problems due to poor battery quality: Dell DELL laptop battery short-circuit caused a fire accident, had to 27000 notebook Computer batteries were all recycled; Compaq also recovered and replaced about 55,000 battery packs sold with some laptops, similarly to the Dell incident. 
Finally, when we buy a laptop, we must pay close attention to what kind of warranty manufacturers provide for the battery? The battery is the shortest warranty period for all laptop accessories. Most of them are only warranted for 3 months to 6 months, and some are not included in the warranty. There are very few batteries for up to one year. Therefore, consumers must be sure about the battery warranty time and conditions before buying a laptop, after all, laptop battery prices are not cheap. 
After taking note of the above three principles, let's take a look at what aspects different laptop batteries should pay attention to when purchasing. 
Battery Selection 
The new notebook computer mentioned here refers to a notebook computer without Kaifeng, and its battery should also be brand new. Similar to the new mobile phone battery, there are also floating batteries in the new battery of the notebook computer. In general, the floating electricity amount is 5% to 10% of the total battery capacity. Therefore, if the system reports a low battery level during the unpacking of the new laptop, it indicates that the laptop has not been used out of the box. When users are at ease, they must remember to specify the battery warranty in the purchase contract.