This paper is deals with a solar battery charger to be embedded into an Android student bag model. It is a new multipurpose ESP32-based microcontroller for: a) solar energy conversion into regulated DC energy for charging Lithium-Polymer batteries; b) digital acquisition of battery electrical energy data; c) Bluetooth transmission of this energy data to an Android monitor. On the ESP32 microcontroller side, the application program required for data acquisition and Bluetooth server configuration, is developed using Arduino IDE-C++. Then, on the Android terminal side, a Smartphone equipped with a configured application for virtual monitoring of the charging energy data of the powered battery. Finally, an experimental prototype of the proposed device is pointed out and well tested, then he testing results obtained and presented are very satisfactory.