What is your warranty policy? 10-year warranty with optional after-sales support. At GSL Energy, we proudly announce that our state-of-the-art liquid-cooling outdoor lithium-ion battery cabinets have received UL9540, UL1973, and IEC62619 certifications. These internationally recognized certifications underline our commitment to providing reliable, safe, high-performance energy. anufactured/sold by Zonyue Energy Storage Company. With IP54/IP55 protection, anti-corrosion design, and intelligent temperature control, they are ideal for telecom base stations, remote power supply, and containerized microgrids.