Lithium-ion batteries are often referred to as Li-ion batteries. For batteries to use in mods you need to look for rechargeable Li-ion batteries. They come in two varieties: protected and non-protected. The protected batteries are longer because they have a circuit built into them to fail before the battery fails.
Li-ion batteries are among the most powerful rechargeable batteries available. They are made from a compound of Lithium that is flammable. A failing battery can vent dangerous gases or cause a fire. This is why it is essential to buy the best battery you can afford and ensure that it is recharged properly.
You will have seen many stories in the media about house fires caused by e cigarette batteries – this is very rare in practice. The following devices also use Li-ion batteries: mobile phones, laptops, tablets, digital cameras, camcorders, cordless drills, etc.
IMR Li-ion batteries are the recommended types for use in electronic cigarettes. They are made from a different compound compared to other Li-ion batteries, lithium and manganese. They have a lower internal resistance. This means that they stay cooler and can deliver a higher current.
IMR batteries are known as ‘safer chemistry’ batteries because they are more likely to vent gas in a fail than to burst into flames. Again, failure rate is very low.