{HEAD ~ These non orthogonal slots}, when coupling to corresponding non orthogonal rails in {TAIL ~ the pocket} of a battery charger, allow 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 
{ HEAD ~ These non orthogonal slots } , when coupling to corresponding non orthogonal rails in { TAIL ~ the pocket } of a battery charger , allow 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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