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12 Volt 12A (or 5A) Uninterruptible power supplies include a 1.2AH battery for 12V buses, cars, boats and vehicles to give a robust battery back-up in vehicles. (BBU).
backup - 12V battery back-up system using a relay - Electrical Engineering Stack Exchange
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Backup Battery Switching Module for 12Vdc UPS up to 150W
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