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