Basic UPS Circuit
The above diagram is a basic Uninterupted Power Supply (UPS) circuit. This is a very simple and inexpensive circuit.
This circuit can be adapted/modified for other regulated and unregulated voltages by using different regulators and batteries. For a 15 Volt regulated supply, you may apply two 12V batteries connected in series (it will become 24V) including a 7815 regulator (will be 15V stabilized voltage output). There is a lot of flexibility in this circuit.
The complete explanation you can view this page.

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why is the battery not charging above 7V in a 12V UPS battery?
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