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What is the current leak for sbRIO 9607 on board battery?

We need the sbRIO 9607 to keep time after powered off. However, we notice that the on board battery cannot keep it well. We test the battery on a new bought sbRIO-9607 and find the battery voltage is 2.7V, which means the battery is dead. Then, we replace the battery with a new one, whose voltage is measured as 3.4V. We put the board there without power-on. After a day and half, we measure the battery voltage again and find the voltage be 2.8V. It seems there is a big current leak there. Can anybody help on what the problem is?

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