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I recently moved from a large house to a flat, we have a Maintained system of emergency lights, we had a power cut recently and the Battery backed Emergency lighting came on but only for 5 minutes, we have arranged for an electrician to fit new batteries in all the Emergency lights (I could not do them because of the insurance etc., the guy who came to look at them said these fittings (complete fittings) have to be changed every 10 years, is this correct.