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I'm developing a CCTV system out of a pi 2 modal b and everything is on track using noIR camera and stuff. Since a CCTV should work for few hours without power, I'm in need of a backup power source when the mains are off.

Is there any circuit where I could plugin my regular power source an if that is out, a backup battery would get activated. I've seen USB batteries which is usable in this scenario but, that would need manually to switch the power source.

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    Buy an UPS (Uninterruptible Power Supply), – joan Nov 13 '15 at 9:25
  • That's too costly for me! any simple solutions? – Imesh Chandrasiri Nov 13 '15 at 9:28
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    That is the simple solution! – joan Nov 13 '15 at 11:15
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    There's no getting around buying additional hardware here, since you need 1) An alternative power source, 2) An intermediate circuit for "uninterruptedly" switching the supply when mains fail. – goldilocks Nov 13 '15 at 11:54
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Uninterruptible Power Supply UPS

(Just as joan suggested in the comments). There are numerous solutions available - ranging from simple to expensive.

See:

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I bought it directly from manufacturer www.pimodules.com

Works very good, supply up to 2A + many extras.

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