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Battery management along with power management

Hii,

 I am having auxiliary supply for my system and want to use a battery that can get charge when the power is supplied from auxiliary port and also help in delivering power to system from battery when supply is off.

Can anyone suggest me the power management IC that can help in managing both supplies in alternative.

My system has total capacity of 3A maximum.

Also suggest battery that can be used to deliver enough current to system.