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The heart of the PT9 ULB has to be replaced by competent skilled staff every three years, otherwise, the BSH approval will expire. Battery kit consists of a lithium battery, an O-ring, which has to be changed when the battery is replaced as well as a current date sticker for labelling of the acoustic beacon. The enclosed instruction manual gives detailed information regarding the correct battery replacement.
Use of an unauthorized battery will void the license and the warranty and may cause a risk of fire or explosion.