Our Sonim replacement batteries use original high-quality lithium-ion cells from Samsung, Panasonic and LG, each battery has been strictly inspected and passed a series of safety certifications such as HKSI, CE, UL, ROHS, ISO 9001/9002 , in line with international standards, 100% compatible with the original manufacturer's specifications, and can match the original battery in performance. We insist on being customer-centric, and we sell not only batteries, but also service and trust! We provide you with a 30-day return service and a one-year warranty.