2x 0121147748, BA 370 PX, BA-370PX, BA370 Battery for Sennheiser MM 400 X, 450 X, 500 X, 550 X, PX 210 BT 270mAh Headphone / Headset Battery Replacement  ...  more

Whether you’re working, gaming or listening to music, this replacement Sennheiser MM 400 X battery for Sennheiser headphones will keep you online and charged for longer.

This CELLONIC® Lithium Polymer high-performance, rechargeable Bluetooth headset battery is the perfect Sennheiser wireless headphone battery replacement, giving you long-term, reliable use – with longer breaks between charges.

Specifically designed for use as a 0121147748, BA 370 PX, BA-370PX, BA370 replacement wireless gaming headset / call centre headset battery, with 100% compatibility for MM 400 X earphones and more.

Long runtime, full compatibility: Sennheiser MM 400 X battery with 270mAh high capacity

✔ 100% compatible replacement – Replaces your original Sennheiser 0121147748, BA 370 PX, BA-370PX, BA370 battery
✔ Long battery life, high capacity – 3.7V high conductivity headphone battery, 270mAh high capacity
✔ No capacity loss – thanks to modern Lithium cells without memory effect technology
✔ Fewer charging breaks – less time spent waiting for your headphones to charge 

Proven quality, certified safety: Sennheiser 0121147748, BA 370 PX, BA-370PX, BA370 replacement batteries for up to 1000 charging cycles

✔ Long-lasting, consistent performance – high-quality Lithium Polymer cells for up to 1000 charging cycles
✔ Certified safety – CE & ROHS certified, Grade A battery with short-circuit, overheating and overvoltage protection
✔ Suitable for – sub-zero and high temperatures - particularly weather and temperature resistant
✔ Thorough, comprehensive testing – each battery cell is tested to ensure all safety requirements are met and that it holds and maintains the correct capacity - all before installation 

Replacement 0121147748, BA 370 PX, BA-370PX, BA370 battery for your Sennheiser MM 400 X earphones
Brand: CELLONIC® Headset Replacement Battery
Capacity: 270mAh
Voltage: 3.7V
Cell Technology: Lithium Polymer
Dimensions: 38.40 x 30.70 x 6.60mm
Alternative for / Replaces: Original 0121147748, BA 370 PX, BA-370PX, BA370 battery 

★ 3-Year Guarantee ★
As an international specialist retailer since 2004, we know what matters when it comes to high-quality replacement headphone, headset & earbud batteries. That's why our replacement Sennheiser batteries come with a 36-month guarantee!