Exide Star 1125VA Inverter + Exide Inva Homz 1500 Tubular Battery Combo An inverter takes DC to AC, like the small inverters you can buy for your car, UPS is Unlimited Power Supply, that means in the event of loss of power then your UPS kicks into battery mode and you don't loose your power supply, and you can run on batteries for days, if you have a large enough UP Just like any home apparatus your inverter and its battery require regular support for the consistent working and longer life. The normal life expectancy of the original Exide inverter battery is 5-6 years. Some battery maintenance tips to extend its life