Laptop batteries look plain and solid from the outside. They come in all shapes and sizes, but for the most part all of them look the same inside. Laptop computer batteries usually consist of 6 to 8 cylindrical lithium-ion 18650 cells with a PC board which communications with the laptop computer and offers over charging (voltage) protection.
The outside of a Laptop computer batteries is the casing. It holds all the insides together and protects your hands when you are holding it. Li-ion stands for lithium-ion. It is the most commonly used chemistry for dell laptop battery charger because of its high charge density and compact size. However, these perks come with great safety concerns. If lithium comes in contact with air, it will burn violently.
This is a image of a typical Li-Ion laptop computer battery with its casing removed. A common misunderstanding is thinking these batteries are made from one solid cell: False. Laptop computer batteries are made from multiple battery cells that are arranged in specific ways to attain the desired voltage and amperage. (Plz refer to our Serial and Parallel Connections weblog located here for more information).As with most batteries you have an outer case made of metal. The use of metal is important here because the battery is pressurized. This metal case has some kind of pressure-sensitive vent hole. If the laptop battery gateway ever gets so hot that it risks exploding from over-pressure, this vent will release the additional pressure. The battery will probably be useless afterwards, so this is something to avoid. The vent is strictly there as a safety measure. So is the Positive Temperature Coefficient (PTC) switch, a tool that is meant to keep the battery from overheating.
In the event you were to crack open a Laptop computer battery pack (something we DO NOT recommend because of the likelihood of shorting out a battery and beginning a fire) you would find the following.
