Rahmadani, E., Helendra, H., & Husna, H. (2022). Design A Mini Power Bank As A Storage Electrical Energy of Dragon Fruit Stems. KONSTAN - JURNAL FISIKA DAN PENDIDIKAN FISIKA, 7(1), 40-45. https://doi.org/https://doi.org/10.20414/konstan.v7i1.103