battery failure

A backup battery provides power to a system when the primary source of power is unavailable. Backup batteries range from small single cells to retain clock time and date in computers, up to large battery room facilities that power uninterruptible power supply systems for large data centers. Small backup batteries may be primary cells; rechargeable backup batteries are kept charged by the prime power supply.

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    Emergency Exit

    I don’t know the feasibility of this and hope someone can help. In the event of a failure of the battery or a software glitch where I became unable to open a door or window and was trapped inside the car how would I be able to get out? Is there a simple way or would I have to call for...
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