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Sunj High Capacity Primary Lithium Battery 3.6V D Size Er34615h CE UL Certification. High Energy Density: Up to 650Wh/kg and 1280Wh/L for superior power storage. Long Service Life: Achieves a service life of 10 to 20 years with superior shelf life. High Capacity: Nominal capacity of 19000mAh with 3.6V nominal voltage. Comprehensive Certifications: CE, UL, RoHS, UN38.3, and MSDS certified for global safety. Robust Construction: Carbon-clad, stainless steel shell with fully sealed structure. Flexible Customization: OEM and ODM services available with flexible customization options.