8 3 ▁until ▁appro x . ▁ 1 9 8 5 . ▁Med ium ▁head ▁only ▁with ▁push ▁button ▁switch . ▁Produ ced ▁in ▁Bar st ow , ▁CA . ▁and ▁Nor rist own , ▁PA . ▁ ▁Kel - L ite ▁attempted ▁to ▁get ▁into ▁the ▁re charge able ▁market ▁with ▁a ▁tail ▁cap ▁char ger , ▁only ▁a ▁few ▁were ▁actually ▁sold . ▁ ▁Technology ▁The ▁Kel - L ite ▁was ▁intended ▁as ▁a ▁replacement ▁for ▁the ▁b aton ▁carried ▁by ▁police ▁officers . ▁The ▁series ▁of ▁Bat on ▁Light ▁models ▁( available ▁in ▁various ▁lengths ▁from ▁ 1 8 ▁to ▁ 2 6 ▁inches ) ▁were ▁designed ▁by ▁Norm ▁Nelson ▁in ▁ 1 9 7 3 ▁as ▁a ▁direct ▁replacement , ▁which ▁would ▁fit ▁into ▁a ▁standard ▁b aton ▁ring ▁on ▁the ▁officer ' s ▁bel t . ▁ ▁Kel - L ites ▁were ▁available ▁in ▁sizes ▁r anging ▁from ▁a ▁model ▁using ▁two ▁" 1 / 2 ▁D " ▁cells ▁( t ogether ▁the ▁length ▁of ▁one ▁D ) ▁to ▁those ▁using ▁ 7 ▁D ▁cells , ▁and ▁any ▁size ▁in ▁between , ▁as ▁well ▁as ▁C ▁cell ▁models . ▁A ▁total ▁of ▁ 4 9 ▁different ▁models ▁were ▁made . ▁▁ ▁Prior ▁to ▁the ▁Kel - L ite , ▁flash light s ▁were ▁relatively ▁frag ile ▁and ▁und ep end able , ▁usually ▁made ▁either ▁of ▁m old ed ▁pl astic ▁or ▁stamp ed ▁sheet ▁metal . ▁ ▁Dro pping ▁one ▁would ▁usually ▁break ▁the ▁bul b ,