Buy a new set of Duracell batteries from a reputable outlet (such as Maplin) and make sure they are well within date.
Whilst in Maplin, buy a small tin of contact cleaner. Clean the boards and all contacts. With a small pair of fine nosed pliers make sure there is plenty of good contact at the battery
Before handling the boards or batteries thoroughly wash your hands with plain soap and dry. Wear vinyl gloves if you can.
Try that first.
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