Ngenxa yokuthi umthamo webhethri, ukumelana kwangaphakathi, i-voltage kanye namanye amanani epharamitha awahambisani ngokuphelele, lo mehluko ubangela ukuthi ibhethri elinamandla amancane kakhulu lishajwe kakhulu futhi likhishwe kalula ngesikhathi sokushaja, futhi umthamo webhethri elincane kakhulu uba mncane ngemva kokulimala, okungena emjikelezweni omubi. Ukusebenza kwebhethri elilodwa kuthinta ngqo izici zokushaja kanye nokukhishwa kwebhethri lonke kanye nokwehla kwamandla ebhethri. Umsebenzi we-BMS ongenabhalansi umane nje ungumqoqi wedatha, okungeyona neze uhlelo lokuphatha. Umsebenzi wakamuva wokulinganisa we-BMS osebenzayo ungafinyelela ugesi oqhubekayo we-5A. Dlulisa ibhethri elilodwa elinamandla aphezulu ebhethrini elilodwa elinamandla amancane, noma sebenzisa lonke iqembu lamandla ukuze wengeze ibhethri elilodwa eliphansi kakhulu. Ngesikhathi senqubo yokusebenzisa, amandla asatshalaliswa kabusha ngesixhumanisi sokugcina amandla, ukuze kuqinisekiswe ukuhambisana kwebhethri ngezinga elikhulu, kuthuthukiswe ibanga lempilo yebhethri futhi kubambezele ukuguga kwebhethri.