MPF Products 600mAh AHB622540N01 Battery for Sennheiser HD 4.40 4.50 Urbanite XL Momentum 2.0

Replacement Battery for Sennheiser Headphones

This 600mAh lithium-polymer pack replaces the original AHB622540N01 cell in Sennheiser HD 4.40, HD 4.50, Urbanite XL and Momentum 2.0 wireless models. It restores the factory 3.7V 2.2Wh specification so the headphones regain their rated runtime. The part is new and carries a one-year replacement warranty from the manufacturer. Installation requires opening the earcup and reconnecting the existing connector.

Capacity and Chemistry Limits

The 600mAh capacity and 2.2Wh energy rating define the maximum playtime between charges; no higher-capacity cell fits the same cavity. Lithium-polymer chemistry delivers the nominal 3.7V voltage but will degrade with repeated cycles, so runtime will gradually shorten over years of daily use. The pack has no built-in fuel gauge; the headphones estimate remaining charge from voltage alone. Extreme cold or heat will temporarily reduce available capacity below the rated figure.

Upgrading from a Worn Original Cell

This battery replaces an exhausted or swollen original pack that no longer holds a usable charge. The jump is worth it when the headphones cut out early, show rapid percentage drops or physically bulge at the earcup. It is not for owners seeking longer life than the factory design, nor for models outside the listed compatibility list. If the headset has additional faults such as a damaged charging circuit, a fresh cell will not restore operation.