Does not work in Sony MDR-RF970RK Headphones
The original Sony branded battery that came with my Sony MDR-RF970RK headphones does not hold a charge for very long no matter how long it charged.  So I bought these rechargeable batteries (2-pack) to replace it. Unfortunately, the new batteries do not charge at all (the red light on the headphone charging station does not come on). I've swapped the old and new batteries back and forth to see if I'm doing something wrong.  But only the old Sony battery is recognized by the charger (the light comes on), while the new batteries are not.<br /><br />The product description clearly states the batteries are compatible with Sony MDR-RF970RK.  I will be returning the batteries.
Rating: 1 stars