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There are often queries as to how long an energiser will last for and it is difficult to give a quantitative response. I know of energisers being active well in excess of 10 years but it does depend on how the energiser is housed and if it is worked to its capacity limits. All our energisers have a minimum 2 year manufacturers warranty and many in excess of that.
Horizont recently ran an advertised competition to find their oldest working, functioning energiser and a model manufactured in 1955 was found still working on a dairy farm outside Soest, Dortmund. This was closely followed by one manufactured in 1957 and another in 1958. All electric fence energisers were still working.
This then will give you some idea on the possible life of an energiser.