I bought a gum battery, but I couldn't charge it... In that case, LiitoKala is recommended ✨ 10% off with a follow! [NH-14WM NH-10WM HHF-AZ201S HHF-AZ01 RP-BP61 ADN55BT MHB-901 Compatible] [Product Description] Can be used for audio equipment such as MD and CD players. Ni-MH Square Nickel-Metal Hydride Rechargeable Battery Number of charging cycles: Approximately 1000 times Voltage: 1.2V Capacity: 1450mAh * Although new, it has been opened once and charged to confirm that the maximum capacity has not decreased significantly. Confirmed that it can be played on an MD Walkman. ☆Caution☆ Cannot be used with SONY Hi-MD MZ-RH1, MZ-NH3D, MZ-DH10P, MZ-EH1 ＜Charger Specifications＞ LiitoKala Lii-100B - Brand: LiitoKala - Model: Lii-100B - Input Voltage: DC 5V 1A - Output Voltage: DC 4.2V 500mA/1000mA - Compatible Battery Types: AA, AAA, 18650, 14500, 18490, 26650, etc. Automatically detects and charges Nickel-Metal Hydride, Nickel-Cadmium, and Lithium-ion batteries. Built-in protection circuit, overcharge protection, over-discharge protection, short-circuit protection. Charging status lamp. You can change the charging current by long-pressing the SELECT button (0.5A, 1A). Please purchase an adapter with an output of 2A or more at Daiso, etc. (sold for 330 yen). Power can also be supplied from a computer's USB-A port. We will ship after confirming the operation. If there is a problem with the product, please contact us before rating. Please feel free to consult us about adding more batteries. Can be changed to DoublePow. Please take a look at my profile and other products for sale! → #falca_store * This is an overseas product, and there may be slight scratches or stains from manufacturing. Please understand. Cannot be used with the following products: SONY Hi-MD MZ-RH1, MZ-NH3D, MZ-DH10P, MZ-EH1