2x Battery for Sennheiser MM 400, 450 X, 400 X, 550, 450, 500 X, PX 210 BT, 360, 360 BT, 310 BT 0121147748, BA 370 PX, BA-370PX, BA370 (270mAh, 3.7V) from CELLONIC  ...  more

100% compatible replacement for Sennheiser batteries

Specifically designed to fit your wireless headphones. See the full compatibilities list.

Guaranteed 270mAh capacity

Unlike many competitors, our headphone and headset battery capacities are true, real and guaranteed. This Lithium-Polymer battery is 270mAh and offers long runtimes with fewer charging breaks - exactly as advertised.

High-performance 3.7V 0121147748, BA 370 PX, BA-370PX, BA370 battery

Whether you’re working, gaming or listening to music, our long-life replacement headset and headphone batteries deliver consistently high performance that matches or exceeds that of your original earphone battery - all for a high number of charging cycles.

Superior quality and safety standards

Battery specialists since 2004, all our replacement batteries undergo strict, rigorous testing to fully comply with the highest EU standards and beyond - that’s why they come with a 3-year guarantee.

The sustainable choice

Replace the battery, not your device. It’s the smarter, cheaper, eco-friendlier choice, saving you money while cutting your environmental footprint through recycling.

Choose CELLONIC and never compromise on quality. Order now!