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The shelf life of the Quantum battery 990XCP98000 is 10 years with 0.5% loss of capacity per year. The same specifications applies to a PLC in the on condition 24x7.
With the PLC in the off condition, the battery will maintain the memory to the following PLCs as indicated:
140CPU11302 454 days
140CPU11303 238 days
140CPU21304 454 days
140CPU42402 238 days
140CPU43412X 238 days
140CPU53414X 119 days