This is not a sales pitch for Waveband Communications but I have been happy with their packs performance and they have a good warranty. Looking at the Specification sheets for the XTS5000 Lithium Ion and Lithium Polymer packs no factory was listed but the Spec and SDS listed Panasonic or equivalent cells -Sanyo Electric Co., Ltd.・Address: 222-1 , Kaminaizen, Sumoto City, Hyogo, Japan. Some packs are IP68 rated and they claim that their batteries are manufactured at ISO9001 certified manufacturing facilities that are committed to manufacturing eco-friendly products within ROHS standards. All of our two-way radio batteries undergo rigorous testing including temperature, vibration, shock, drop, short circuit and overcharge to ensure unmatched dependability. Waveband actually published on their website an article "The Top Battery Manufacturers and Suppliers For Two-Way Radios In 2024" The top ten (details are in article): Alexander Technologies, Emerging Power Battery, Motorola Solutions Batteries, Multiplier Batteries, OSI Batteries, Harris, Empire Scientific, Global Technology Systems, and Honeywell.