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Don't settle for generics with no real warranty or pay crazy prices for expensive original parts. Buy a brand you can trust. Choose UpStart Battery and get a factory warranty and the most trusted name in America for replacement parts. Product Specifications Two MDR-RF4000 Batteries for Sony Chemistry: Ni-MH Output Volts: 2.4 V Brand: UpStart Battery Warranty: Lifetime Warranty This Product works in or replaces the following OEM model numbers: MDR-RF4000 BP-HP550-11 MDR-RF4000K MDR-RF810 MDR-RF810RK MDR-RF840 MDR-RF840RK MDR-RF850 MDR-RF850RK MDR-RF860 MDR-RF860RK MDR-RF925 MDR-RF925RK MDR-RF970 MDR-RF970RK