Electronic　waste　has　become　a　serious　worldwide　problem　due　to　the　high　consumption　of　electronic　devices.　To　palliate　this　problem,　we　fabricated　flexible　and　biodegradable　supercapacitors　(SCs)　using　electrodes　made　of　avocado-peel　+　graphene　(AVG　electrode).　The　electrochemical　efficiency　of　these　SCs　was　enhanced　by　depositing　LaMnO3　(LM)　and　LaSrMnO3　(LSM)　perovskites　on　their　electrodes.　Those　perovskites　are　formed　by　microparticles　with　irregular　shape/morphology　and　have　sizes　of　0.8–4　μm.　The　electrochemical　evaluation　of　the　avocado　based　SCs　revealed　a　maximum　capacitance/energy-density　of　1100.9　F　g−1/97.8　Wh　kg−1　and　703.7　F　g−1/62.6　Wh　kg−1　for　the　SCs　containing　the　LaSrMnO3　and　LaMnO3　perovskites　(AVG/LM-SC　and　AVG/LSM-SC　devices),　respectively.　If　no　perovskite　is　added　on　the　SC　electrodes,　a　lower　capacitance/energy-density　of　230.3　F　g−1/18.1　Wh　kg−1　is　obtained　(AVG-SC　device).　Thus,　adding　the　Sr　dopant　in　the　LM　perovskite　deposited　on　the　SCs　electrodes　improved　the　energy　density　and　capacitance　of　the　SCs　by　~　56%　(with　respect　to　the　AVG/LM-SC　device).　The　avocado　based　SCs　were　subjected　to　mechanical　deformations　(500　bending　cycles)　and　the　maximum　loss　of　capacitance　was　22.4,　14.3　and　11.5%　for　the　AVG-SC,　AVG/LM-SC　and　AVG/LSM-SC　devices,　respectively.　In　addition,　the　analysis　by　XPS,　UV-VIS　absorbance　and　Raman　indicated　the　presence　of　the　Mn2+/Mn3+/Mn4+　species　and　oxygen　vacancies　in　the　SCs　and　worked　as　redox　sites　for　the　storage　of　charge.　In　general,　this　investigation　showed　that　efficient　and　biodegradable　SCs　can　be　fabricated　using　the　avocado-peel,　which　is　an　abundant　waste　produced　in　the　Mexican　food　industry.　©　2022　Elsevier　Ltd　and　Techna　Group　S.r.l.