Gizzu- Smizzu

I was given as a gift a Gizzu DC UPS for my router during loadshedding. It worked well for a while and now when the power goes off it doesnt work anymore. A technician from Gizzu informs me that it might be a faulty battery pack or mainboard. They offer a guarantee but say that its uneconomical to repair as they are unable to ship batteries into the country. Then they must replace the one I have otherwise stop fooling the public.