However, {HEAD ~ the states} of charge of one or more of the battery modules may vary from the nominal state of {TAIL ~ charge} , for example, due to manufacturing tolerances of rechargeable cells of the battery modules 
However , { HEAD ~ the states } of charge of one or more of the battery modules may vary from the nominal state of { TAIL ~ charge } , for example , due to manufacturing tolerances of rechargeable cells of the battery modules
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH