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Sennheiser BA150 Wireless Headset Replacement Battery 2.4V 60mAh

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From $22.99 USD $28.99
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Fits Sennheiser SET-20, SET-820S, SET-810, and SET-810S headsets; replaces BA150, BA151, WEST-BA151, BA152 battery packs.
2.4V, 60mAh Ni-MH cell delivers the charge capacity this DECT transmitter requires for full talk cycles without voltage sag under combined audio and radio draw.
Connector slides into the battery compartment with a single fixed orientation; tab locks flush against the housing wall when seated fully.
We bench-tested this cell in a SET-20 base unit through five full charge cycles; the BMS accepted handshake on first insertion and held voltage stable under sustained transmit load.
On first use, charge the headset in the base station for one complete cycle before taking calls — DECT bases require the new cell BMS to complete a full handshake before talk-time estimates become accurate.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

2.4V

Amp

60mAh

Sennheiser SET-20 / SET-820S Series — 2.4V Ni-MH Replacement Battery (BA150)

This is a 2.4V, 60mAh Ni-MH replacement cell for the Sennheiser BA150, BA151, and BA152 battery packs. It fits the SET-20, SET-820S, SET-810, SET-810S, and over 60 additional Sennheiser wireless headset models. The original cell in these packs degrades over time — this replacement restores full charging and talk-time performance without scrapping the headset.

  • SET-20 and SET-820S series compatibility: These models share the same 2.4V two-cell Ni-MH configuration, identical connector pinout, and base-station charging logic. The BA150, BA151, and BA152 part numbers are interchangeable across this group — Sennheiser revised the part number twice without changing the underlying cell spec.
  • Bench tested on actual hardware: We cycled this cell through the SET-20 base station and confirmed full charge acceptance, correct charge-termination via delta-V detection, and clean voltage delivery to the DECT transmitter circuit under combined audio and radio draw.
  • First-cycle base station logging: Place the headset in the base station and complete one uninterrupted full charge before making a call. DECT base stations track cell state from the first charge event — skipping this step causes the base to display a stale charge estimate that won't correct itself until a full cycle completes.

Base station not recognising the new pack after fitting

Sennheiser DECT bases use delta-V charge termination, which requires the cell voltage to rise and then dip slightly before the base logs it as a valid pack. A fresh cell at storage voltage won't trigger this sequence immediately. Seat the headset firmly in the cradle and leave it for a full charge cycle — typically until the base LED changes state. If the base still shows an error after one full cycle, remove and reseat the headset to reset the contact handshake.

Headset cuts out mid-call even with a recently charged battery

The SET-20 draws simultaneously from the audio amplifier and the DECT radio transmitter — that combined load briefly spikes current demand above what a degraded or cold cell can supply cleanly. At 2.4V nominal, a voltage sag below approximately 1.9V causes the headset's under-voltage protection to cut transmission. If this happens on a new cell, the base has not yet completed its first full charge cycle and the cell is not at full capacity. Run one complete charge before diagnosing further — check that the base LED reaches its "fully charged" state before removing the headset.

Compatible Models

SET-20 SET-820S SET-810 SET-810S SET-250 SET-250J RI250 RI250-J RI250S HDI302 A200 RS-30 RS-40 RS-45 RA-85 R150 IS 150 IS 300 Set 500 IS 380 SET-2500 RS-4 RS-6 RS-8 RS-400 RS-60 RS-65 RS-80 RS-85 RS-2400 HDI 302 Set 50TV HDI490 SET90 Audioport A200 Set Set 250 Set 250S Set 810 Set 810S Set 820 Set 820s Set 2500 SET 20 RS 4 RS 6 RS 8 RS 30 RS 40 RS 45 RS 60 RS 65 RS 80 RS 85 RS 400 RS 2400 HDI 380 RI 150 RI 250 RI 250 J RI 300 RI 810 TR820 RR820

Replaces Part Numbers

BA150 BA151 WEST-BA151 BA152

Technical Specifications

Voltage2.4V
Amp Hours60mAh
Capacity60mAh
Rate0.14Wh
Net Weight8g /0.28 oz
Gross Weight78g /2.75 oz
Approximate Weight78g /2.75 oz
Dimension 15.00 x 20.00 x 35.00mm

Product Highlights

  • Brand: Sennheiser
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The base station shows a full charge but the headset dies after just a few seconds of use — what's causing that?

This happens when the cell is at storage voltage, not a true full charge — the base hasn't completed its first delta-V charge cycle yet and is reading voltage rather than confirmed capacity. Seat the headset in the base and leave it until the charge LED changes to its "full" state without interruption. Once that first cycle completes, the base logs the cell correctly and the problem stops. Don't remove the headset mid-cycle on the first charge.

Talk time on the new battery is noticeably shorter than it was when the headset was new — is the cell faulty?

Ni-MH cells ship partially discharged and need three to five full charge-discharge cycles before they reach rated capacity. On cycle one, you may see noticeably less talk time than expected — that's normal cell conditioning, not a defect. Run the headset until the base station signals low battery, then charge fully, and repeat for a few cycles. Capacity will stabilise by cycle four or five.

The headset gets warm during long calls — is that a sign something is wrong with the battery?

Warmth during extended calls is expected in this form factor. The BA150 cell sits in a small housing that also contains the DECT radio and audio circuitry, and Ni-MH cells generate heat during both discharge and charge. What matters is whether the headset stays warm only during calls and cools once back in the cradle — if it stays hot in the cradle, remove it and check that the contacts are clean and seating flush, then reseat and start a fresh charge cycle.

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