Lithium batteries are a type of battery, and many types of batteries include lithium batteries, nickel-cadmium, nickel-hydrogen, lead-acid, silver oxide, and zinc-manganese alkaline dry batteries. General notebooks use lithium batteries. The 3-core refers to the laptop battery that contains several small lithium batteries (just like a few dry batteries for a flashlight). The N core indicates that N batteries are connected in parallel. Laptop battery voltage is basically around 11V, universal. The same battery, so the more cores connected in parallel, the larger the capacity, the longer the battery life. And the capacity is proportional to the number. Ordinary home users recommend using a core with a standard computer, such as a 3-cell lithium battery, because it is mainly at home and has a stable power supply. Ordinary office users recommend using 6-cell and 8-cell lithium batteries, because the standby time is relatively long, making your office more convenient. If you have high mobile office requirements, you can consider 9-cell and 12-cell lithium batteries. This battery is too heavy to carry, and there is no 6-core and 8-core stability.