WARNING: A new model of ORIGINAL OEM Sony HP850 battery is being supplied, as the HP550 is no longer available from Sony.

This battery has been professionally modified by us to fully replace the original HP550. The new battery has an increased capacity compared to the original HP550 (from 550 mAh to 800 mAh).

This NEW ORIGINAL BATTERY from Sony has been expertly modified in our electronics service to fit perfectly into your headphones instead of the original battery. Due to the manual mechanical modification, there may be some scratches or signs of handling on the back of the battery cover, however, the battery is new, fresh, and unused; it was supplied to us by Sony Czech Republic. It is still a brand new, never used, never charged original Sony battery.

For headphone models:MDR-IF245RK, MDR-RF4000, MDR-RF4000K, MDR-RF810, MDR-RF810RK, MDR-RF840, MDR-RF840RK, MDR-RF850, MDR-RF850RK, MDR-RF855R, MDR-RF860, MDR-RF860RK, MDR-RF925, MDR-RF925RK, MDR-RF970, MDR-RF970RK, MDR-RF811RK, MDRIF245RK, MDRRF4000, MDRRF4000K, MDRRF810, MDRRF810RK, MDRRF840, MDRRF840RK, MDRRF850, MDRRF850RK, MDRRF860, MDRRF860RK, MDRRF925, MDRRF925RK, MDRRF970, MDRRF970RK, MDRRF811RK

Specifications:

• Type: 2 AA batteries
• Voltage: 2.4V