HQRP 2-Pack Battery Compatible with Sony NW-MS9 NW-MS11 TCM-80V WM-EX190 WM-EX615 WM-EX670 WM-EX672 MZ-R55

I was very happy to get a product that I definitely needed since this old Minidisc technology is no longer manufactured and I didn't have the AA side adapter for portable use. Having this two pack is perfect. I never use more than one, so I will have a backup when the 1st battery goes. I may actually order a couple more just in case.

don't charge, not work, no buy this batteries

These batteries are an ideal replacement for batteries in the Sony WM-EX range of cassette Walkmen, Panasonic RQ-SX series cassette players and Sony CD Walkmen, all of which take what became known as Gumstick batteries. They charge as intended and seem a good replacement for the obsolete Sony and Panasonic batteries.