yes it's a Li-ion battery in phones/computers etc... while being li-ion in e-cigs as well... they are DIFFERENT TYPES between the phones/computers and the e-cig type. while they are made from the same materials, they are made with different requirements, this is why you cannot just take a battery from a computer and place it in an e-cig. abusing these types of
batteries is exactly how all those venting, fires and explosions happen that news likes to play. these are high use/high drain batteries, quick charging etc will destroy them and lead to the side effects mentioned, phone ones are made for a steady constant use and can take quick charging.