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The following schematic uses \$R_1\$ and \$C_1\$ to set the time period. The leakage current should be less than \$100\:\text{nA}\$. So when it is off, it should not drain the battery. The circuit is also debounced (for all intents and purposes.) simulate this circuit – Schematic created using CircuitLab I intentionally didn't name the BJT. You need ...

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