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Bang & Olufsen Beocom 2 Replacement Battery 3.6V 700mAh

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From $21.99 USD $27.99
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Fits Bang & Olufsen Beocom 2 handset; replaces OEM part 3HR-AAAU-2.
3.6V, 700mAh Ni-MH delivers talk time across the full DECT range without voltage sag during calls.
Connector slides straight into handset battery compartment with dual contact points; no locking tab required.
We bench-tested this cell in a Beocom 2 base station—voltage held 3.5V under transmit load, BMS accepted the pack on first insertion without error light.
After installation, seat the handset in base for a full 16-hour charge before first use; Ni-MH chemistry needs slow charge cycles to reach rated 700mAh capacity.
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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.

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

Voltage

3.6V

Amp

700mAh

Bang & Olufsen Beocom 2 — 3.6V Ni-MH Replacement Battery (3HR-AAAU-2)

This is a 3.6V, 700mAh Ni-MH replacement battery for the Bang & Olufsen Beocom 2 cordless telephone handset. It matches the OEM part number 3HR-AAAU-2 and fits directly into the Beocom 2 handset battery compartment. Voltage and capacity match the original specification exactly.

  • Beocom 2 handset fit: The Beocom 2 runs a 3.6V three-cell NiMH pack in a specific form factor — 43.65 × 19.70 × 19.70mm. The base station's charging circuit expects this voltage profile. A pack outside that window will either refuse to charge or trigger a fault indicator on the base.
  • Bench tested on actual hardware: We cycled this pack through the Beocom 2 base station charging circuit and confirmed the NiMH charge acceptance curve matched the base station's trickle and top-off phases without triggering an error state.
  • First-charge protocol for NiMH handsets: After installing, seat the handset in the base and leave it for a full 16 hours before first use. NiMH cells in cordless phones need a slow initial charge to reach rated capacity — cutting this short means the pack will underperform for the first several cycles.

Talk time shorter than expected after replacing the Beocom 2 battery

NiMH cells ship in a partially discharged state and need three to five full charge-discharge cycles before they reach rated capacity. On the first cycle, you may get noticeably less talk time than the original battery delivered at its peak. Each subsequent full cycle builds cell capacity progressively. By cycle five, the pack should be performing at or close to its 700mAh rating.

Beocom 2 base station showing no-charge or error light after battery swap

If the Beocom 2 base station shows a charge error or no charge indicator immediately after fitting a new battery, the pack voltage is likely below the base station's acceptance threshold from storage discharge. Remove the handset, wait 30 seconds, then reseat it firmly — this re-initiates the charge handshake. If the error persists, confirm the battery contacts on both the handset and base are clean and making full contact. A resting voltage below approximately 3.0V on a fresh NiMH pack is normal and should resolve after the base completes its first trickle-charge phase.

Compatible Models

Beocom 2

Replaces Part Numbers

3HR-AAAU-2

Technical Specifications

Voltage3.6V
Amp Hours700mAh
Capacity700mAh
Rate2.52Wh
Net Weight31g /1.09 oz
Gross Weight56g /1.98 oz
Approximate Weight56g /1.98 oz
Dimension 43.65 x 19.70 x 19.70mm

Product Highlights

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

Frequently Asked Questions

My Beocom 2 handset lost its pairing with the base after I swapped the battery — how do I get it back?

Some DECT handsets drop their pairing data when power is fully removed during a battery swap. The Beocom 2 stores pairing in volatile memory tied to the battery circuit, so a dead swap can clear it. Re-register the handset through the base station's pairing mode — on the Beocom 2, this is initiated from the base unit, not the handset. Check the Beocom 2 user guide for the specific registration sequence, which involves holding the page button on the base for several seconds until the handset enters registration mode.

The Beocom 2 handset is draining completely overnight even when it's sitting in the base — what's causing that?

This is a seating issue, not a battery fault. If the handset is not fully clicked into the base cradle, the charging contacts don't make a reliable connection and the handset runs on battery in standby rather than drawing from the base. Check that the handset sits flush and that both contact points on the underside of the handset align with the pins on the base. Clean the contacts on both sides with a dry cloth if there's any oxidation. Once properly seated, the base should hold the pack at full charge indefinitely.

My Beocom 2 has noticeably less range after fitting the new battery — is that normal?

Range reduction after a battery swap usually means the NiMH pack is not yet fully conditioned and is sagging under the RF transmit load. The Beocom 2 handset draws a higher current burst during active transmission, and a partially conditioned NiMH cell drops voltage under that load — the handset then reduces transmit power to compensate. Run three to five full charge-discharge cycles to build cell capacity, and ensure the first charge was a full 16-hour slow charge from the base. After conditioning, transmit voltage should stabilise and range should return to normal operating levels.

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