Battery Capacity-. It refers to the amount of charge that a battery can store. A higher-capacity battery is required for the uninterrupted running of the phone. The capacity of a battery is measured in the unit mAh (mili Ampere hour). The battery with bigger mAh has a longer backup time.

TYPES:- Two types of batteries usually used in smartphones are Lithium-ion and lithium-polymer batteries.

Lithium-ion battery:-This type of battery has high energy density, lightweight design, and the ability to provide consistent power over multiple charge cycles.

 They have a low self-discharge rate so they can hold charge for a longer time when not in use.

Li-ion batteries provide a relatively stable voltage throughout their discharge cycle. This allows electronic devices to operate consistently without experiencing significant power fluctuations as the battery level decreases.

Li-ion batteries do not suffer from the memory effect, which is a phenomenon where a battery loses its maximum capacity if it is repeatedly charged before being fully discharged. This means you can charge a Li-ion battery at any time without worrying about reducing its overall capacity. Li-ion batteries are generally safe, mishandling or manufacturing defects can lead to rare occurrences of thermal runaway, which can result in battery overheating or even fire. To mitigate these risks, modern Li-ion batteries often incorporate safety features like built-in protection circuits and thermal management.

Lithium polymer battery:-It is a variation of lithium-ion (Li-ion) batteries and shares similar characteristics but differs in terms of their electrolyte and packaging.Li-Pol batteries use a solid polymer electrolyte instead of a liquid electrolyte found in traditional Li-ion batteries. This polymer electrolyte enhances safety, improves flexibility in battery shape and size, and allows for thinner and lighter battery designs. It also reduces the risk of leakage and enables higher energy densities, making them suitable for compact and portable devices