Abstract: A mobile phone battery pack with a recording device for memorizing total recharged number of times is disclosed. The recording device includes a battery charging detecting circuit, a reference clock generating circuit, a central processing unit, a recharged times recording unit. When placing the mobile phone battery in the battery charger for recharging, the total recharged number of times recorded in the recharged times recording unit will be increased by one. Preferably, the mobile phone battery pack incorporates with a display type battery charger with a display. The battery pack is provided with a data output terminal and a series data output device. So, the total recharged number of times memorized in the battery are transmitted to the battery charger through the data output terminal and the recharged number of times is displayed on the display of the battery charger.