On February 25, 2022, the Engineering for Social Responsibility (ESR) Affairs from the Faculty of Engineering, Mahidol University, together with National Telecom Public Company Limited (NT Plc.), launched the new version of the "EGMU Mobile Battery Charger". The discarded old phone booth was recycled into a solar-powered mobile battery charger with braille for people with visual impairments before being delivered to Ratchasuda College. EGMU Mobile Battery Charger provides services to people with disabilities and the public.

Asst. Prof. Dr. Chatchai Kunavisarut, Vice President for Student Affairs and Alumni Relations, Mahidol University, presided over the ceremony and gave the program a congratulatory speech for being socially beneficial. Asst. Prof. Dr. Krissada Asavaskulkeit, Vice Dean for Cooperation and Social Responsibility from the Faculty of Engineering, Dr. Supun Tiptipakorn, Chair of the Department of Electrical Engineering, Wachara Riewpaiboon, Dean of Ratchasuda College, Mahidol University, Boonkiat Kanetwaranan, Engineering Technology Division Manager from NT Plc., along with the executive teams from the Faculty of Engineering, NT Plc., and Ratchasuda College virtually attended the ceremony held at Ratchasuda College, Mahidol University, using Cisco Webex Meeting.

A demonstration on the use of solar-powered mobile battery chargers with braille was given at the ceremony.

The charger works on the principle of turning renewable solar energy into electricity by using a 12 volt 50 watt solar panel and a 12 watt 5.5 amp battery before storing the electrical energy in the capacitor. The stored energy can be used to power the batteries of all mobile phone models. The charger can safely charge up to 5 devices at the same time with various types of charger cables provided, taking only 5–10 minutes each. According to engineering principles, it is efficient, convenient, safe, and environmentally friendly.