My present UPS which worked well till yesterday, suddenly stopped working. Even after charging for 8 hrs, there is absolutely no backup.what should be the better action?The UPS has 2 years warranty, 1year onsite and 1 year carry on. I have already finished 1 year. Further the battery warranty is just 1 year. Should I go ahead and contact the customer care and give it for service?Or Should I go ahead and buy a new UPS. The present one is Zebronics U110. Which brand/model is better.