The battery is in good condition and has low self-discharge. I was able to use it in December, three weeks after charging. It still had more than half its charge remaining. I tested it several times with Sony and Panasonic players, and there were no problems. When I measured the capacity, it was over 1200mAh. There is almost no swelling. Please refrain from price reductions. No returns accepted due to being a used item. Please judge the exterior condition from the images. Please purchase if you understand the value. Products in this condition are not easily found. For CD players, MD players, and cassette players Rechargeable battery (Nickel-metal hydride battery, gum battery) 【Product Description】 Can be used in older generation Walkmans, MD players, CD players, and other audio devices. Ni-MH square nickel-metal hydride rechargeable battery Size: 65mm x 17mm x 5mm Please allow for some error. ☆Important☆ Cannot be used with SONY Hi-MD MZ-RH1, MZ-NH3D, MZ-DH10P, and MZ-EH1. Please check the model number of your player carefully before purchasing. If there is a problem with the product, please contact me before leaving a negative review. I will respond. Please also take a look at my profile and other listed items! → #falca_store #GumBattery #Walkman #Sony #MDPlayer #NickelMetalHydride #RechargeableBattery #Panasonic #NiMH ※This item is not eligible for the follow discount.