These non orthogonal slots, when coupling to corresponding non orthogonal rails in the pocket of a battery charger, allow batteries of various sizes to be inserted into a single charger pocket with {HEAD ~ reliable and consistent electrical connections} between {TAIL ~ the electrical contacts} of the pocket and the charging terminals of the battery 
between
These non orthogonal slots , when coupling to corresponding non orthogonal rails in the pocket of a battery charger , allow batteries of various sizes to be inserted into a single charger pocket with { HEAD ~ reliable and consistent electrical connections } between { TAIL ~ the electrical contacts } of the pocket and the charging terminals of the battery
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 OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH