when it is determined that the discharge level at which {HEAD ~ the capacity} of {TAIL ~ the rechargeable battery} can be learned is not reached, continuing to discharge the rechargeable battery until the discharge level at which the capacity of the rechargeable battery can be learned is reached; and 
when it is determined that the discharge level at which { HEAD ~ the capacity } of { TAIL ~ the rechargeable battery } can be learned is not reached , continuing to discharge the rechargeable battery until the discharge level at which the capacity of the rechargeable battery can be learned is reached ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH