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This can be one of two things. If you test for power across the battery terminals and you find no reading on your multi meter. The battery can be faulty in that one of the link connectors inside the battery has become loose and therefor their is no power at the terminals. Or the terminals on the battery is not making contact to the battery poles. To check this you can use some sand paper and clean the terminals and poles. If after you clean the terminals there is still no power then the battery is faulty and would need replacement.
Did you have time to check for voltage on the battery?