Synergy Digital 5200mAh 14.4V Li-ion Replacement Battery for Xiaomi Roborock S6 Vacuum Cleaner - Compatible with BRR-2P4S-5200S Model - Ultra High Capacity for Extended Cleaning Sessions - Perfect for Hard Floors, Carpets and Pet Hair Removal

Definitely not "Made with high quality Japanese cells." After looking at the picture in the offering, and the tag on my battery, it clearly states "made in China." As a bonus, it came with a big slice across the battery. I did not use a knife to open the packaging. I would not buy from them again. The same battery is cheaper on other listings.