Ibhetri ye-18650 luhlobo lwebhetri ye-lithium-ion etshajwayo kunye nobukhulu obuqhelekileyo be-18mm nge-65mm. Iqhele ukusetyenziswa kwizixhobo ezininzi zombane ezifana neelaptops, iitotshi, kunye nezithuthi zombane. Ibhetri ye-18650 inoxinano lwamandla aphezulu kwaye inokugcina umthamo omkhulu wamandla kubungakanani obuncinci, nto leyo eyenze ukuba ibe lukhetho oludumileyo kwizixhobo eziphathekayo. Ikwayaziwa ngobomi bayo bomjikelo omde, okuthetha ukuba inokuhlawuliswa kwaye ikhutshwe amaxesha amaninzi phambi kokuba itshintshwe. Nangona kunjalo, kubalulekile ukuqaphela ukuba ibhetri ye-18650 kufuneka isetyenziswe ngokuqaphela kwaye iphathwe ngokufanelekileyo ukuphepha iingozi zokhuseleko ezifana nokuqhuma kunye nomlilo.

Ibhetri ye-18650 ibhetri ye-lithium-ion ye-cylindrical enobubanzi be-18mm kunye nobude be-65mm. Yaziswa okokuqala nguSony ngo-1991 kwaye ukususela ngoko yaba yenye yezona bhetri zisetyenziswa kakhulu kwizixhobo zombane ezininzi, kuquka iilaptops, izixhobo zombane, kunye nezithuthi zombane. Xa kuthelekiswa nezinye iintlobo zeebhetri, ibhetri ye-18650 inoxinano lwamandla aphezulu, ubomi bomjikelo obude, kunye nokusebenza okungcono kumaqondo obushushu. Ikwayaziwa ngokukwazi kwayo ukuhambisa imisinga yokukhupha ephezulu, iyenza ibe lukhetho oludumileyo lwezicelo ezifuna ukukhutshwa kwamandla aphezulu. Nangona kunjalo, kubalulekile ukuphatha ibhetri ye-18650 ngokufanelekileyo kwaye ugweme ukugqithisa okanye ukufudumala, njengoko oku kunokubangela ingozi yokhuseleko.