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As above But battery can sometimes prematurely die , might be example in a loft where I seen them die quicker , or sometimes boiler room and so on Yes load test , try it But you might be running all wireless aswell?

Yuasa rate NP batteries as 5 year service life for use within alarm systems, other manufacturers maybe different. From experience you could get 10 years from a Yuasa one but it's best to swap before it's deteriorating.

Hi, The battery should be replaced every four years. This is the manufacturers expected lifetime guidelines. I have known batteries to continue to hold good life long after four years, but accredited installers have to follow the manufactures guidelines. The performance of the battery is effected by many things, the quality of the electricity more spikes and fluctuations will reduce the life of the battery. The quality of the charging system (HKC is generally good) power cuts discharging and charging the battery will reduce its life. The size of the battery should reflect the current pulled from the system.