Battery for RELAY G10 wireless system, 600mAh, 3.7V. This is a type that perfectly matches the size of the genuine product, which is not readily available for sale. (The battery removed from the device is on top in the second photo, and the battery for sale is on the bottom.) I have confirmed that the battery I replaced myself works without any problems. Due to MOQ (Minimum Order Quantity) requirements, I ended up purchasing more than I needed, so I am selling only the surplus. 【Product Condition】 ・New / Unused ・Operation not confirmed (as the product is unused) ・Stored in a dark, room-temperature environment 【Notes】 ・As this is a personal sale, there is no manufacturer's warranty. ・If there is an initial defect, please contact me before giving a rating. ・Please be sure to check the model number and specifications before purchasing. ・The listing will end when the stock runs out. ・Only the battery is for sale (as shown in the fourth photo). ・You can find the replacement method by searching online, but I can offer some advice after purchase. Please feel free to ask any questions in the comments. 〇 Details - Model: Battery for RELAY G10 - Battery Capacity: 600mAh - Battery Voltage: 3.7V - Battery Color: Green Thank you.