"The subject is to ask whether the battery of the mobile phone 99 is healthy and durable?" The battery of mobile phone 99 is healthy and durable. The mobile phone battery operates under normal conditions. When the number of charging cycles reaches 500, the battery should be able to maintain about 80% of the initial capacity at the highest. Therefore, the battery of the mobile phone 99 is healthy and durable under normal conditions, and can basically meet daily needs. Mobile phone battery is an energy storage tool to provide power for mobile phones, which consists of three parts: battery core, protection circuit and shell. Mobile phone battery uses lithium battery and nickel-metal hydride battery. "mAh" is the unit of battery capacity, and its Chinese name is mAh. All mobile phones use lithium-ion batteries, and the closest impression should be132 10 released in 1999, which is equipped with Ni-MH batteries. No mobile phones using Ni-MH batteries can be found around you.