The method 24 where the applying comprises applying to balance the state of {HEAD ~ charge} of the first of the battery modules with {TAIL ~ the others} of the battery modules 
The method 24 where the applying comprises applying to balance the state of { HEAD ~ charge } of the first of the battery modules with { TAIL ~ the others } of the battery modules
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH