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