12V 1.6A Load: Lightweight Rechargeable Battery & Auto Switch Charger Circuit Diagram

Hi,  I need rechargeable  battery with light in weight and longer backup capacity.My power supply ratting is - V(12v),I(1.6amp).I have used 12v 2amp smps for power supply.I need a long hour backup supply which is switched automatically from mains ( means from smps output).When power supply is available than battery will be charged through it and also gives power  supply to load. Please help to find out proper battery with charger circuit diagram and autoswitch circuit between smps supply and battery.

Thanks.

 

This might help you get an idea about your switching problems, https://electronics.stackexchange.com/questio...y-changeover-switching-circuit-for-uninterrup