Zafin motocin da ke zubar da wutar lantarki mai tsafta ba zai iya biyan buƙatun dumama hunturu ba, don haka dumama hunturu matsala ce da motocin lantarki masu tsafta ke buƙatar warwarewa.Matsakaicin madaidaicin zafin jiki (madaidaicin madaidaicin zafin jiki, PTC) sun ƙunshi abubuwa masu dumama yumbu na PTC da bututun aluminium, waɗanda ke da fa'idodin ƙaramin juriya na zafi da ingantaccen canjin zafi, kuma ba su da gyaggyara bisa ga motocin mai.