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Switch to battery power when mains power is lost ? Answered

Hey Guys & Girls

I need a circuit, if anyone can help me please.....

I have a 5.5v wall charger connected to a battery that charges the battery. This battery is used to power led's that i use when we have power outages. I would like to have a circuit where the battery is constantly plugged into the charger with something to divert the power or switch it off when the battery is fully charged, the other part of the circuit needs to "sense" when the mains power goes out and then automatically switch the led's on to run off of the battery.

anyone have a circuit for this lying around?

thanks in advance for any help :)