I had purchased a Xenon UPS system having an Amaron battery, in Aug 2008. After two years, in Sep 2010 it started giving trouble. The battery would get exhausted and the UPS would indicate "Low Battery" within 5 minutes of power cut. The company representative came and inspected the system and said that the battery needs to be changed. But warranty will not apply since the warranty was only for 18 months. I then wrote to the company and complained about the system, but got no response.
I am very disappointed that a supposedly reputed company like Amararaja is selling such shoddy and sub-standard goods. I would caution anyone planning to buy a UPS against buying the Xenon brand. At the time of purchase, some tall claims were made about the battery being good for 4-5 years, but the actual performance is very different.