I have found that when the relays start chattering replacing the memory battery may not fix it, I don't know if part of the powersupply goes out. I have change out KSU's and then replaced the memory battery and then used the repaired KSU to replace another bad unit and then have the repaired KSU die 3 or 4 months down the road. After the KSU dies I would check the battery and it would be at 3.6v... I am not sure why these units die. All of them have been the STS no STSe have failed. If I have a KSU that the relays bus or rattle I replace it with a new STSe and pile the old KSU in my warehouse.
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