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Circuit Board Types - ECPU1/ECPU2 - Battery Replacement Installing the ECPU Board <br />Figure 11. Removing Battery Cover <br />9. When removing battery, please ensure that you do not disconnect the ECPU board from the mother board <br />(Back Plane). <br />10. Check new battery before installing on ECPU board. Confirm it reads 3.4 to 3.6 Vdc. <br />11. Install new battery (see Figure 12). <br />Figure 12. Install New Battery <br />18 <br />