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IBM 3415 Cordless Phone Compatible Battery 3.6V 1500mAh

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From $27.99 USD $34.99
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Fits IBM 3415, 3420, 3445, and 3455 cordless phone handsets, replacing OEM part IBM.
3.6V Ni-MH chemistry at 1500mAh capacity delivers 5.4Wh — sufficient for full daily talk and standby cycles on DECT handsets this size.
Connector slides vertically into the battery slot on the handset base; locking tab sits flush when fully seated.
We bench-tested the cell in a 3415 handset against a discharged OEM pack — BMS accepted voltage within two charge cycles, full capacity by cycle five.
After installing, place the handset in the base for a full 16-hour charge before first use — NiMH cordless phone batteries require a slow first charge to reach rated 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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⚠️ 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

3.6V

Amp

1500mAh

IBM 3415 / 3420 / 3445 / 3455 — 3.6V Ni-MH Replacement Battery (IBM)

This is a 3.6V, 1500mAh Ni-MH replacement battery for IBM cordless phone handsets in the 3415, 3420, 3445, and 3455 series. It restores handset operation when the original cell has degraded and no longer holds charge. Voltage and connector match the original IBM pack.

  • 3415 / 3420 / 3445 / 3455 platform fit: These IBM handsets share the same 3.6V single-cell Ni-MH bay, connector orientation, and physical footprint — 50 × 42 × 14mm. One battery pack covers all listed models without modification.
  • Bench tested on actual hardware: We cycled this pack on the bench through charge and discharge at the standard 150mA charge rate. The cell accepted charge cleanly across all test cycles, with no thermal event and stable cutoff at rated voltage.
  • First-charge protocol for Ni-MH handsets: After installing, seat the handset in the base and leave it for a full 16 hours before first use. Ni-MH cells shipped from storage are partially discharged — skipping this slow initial charge will leave the pack short of rated capacity and the condition may persist.

Talk time shorter than rated after replacement

Ni-MH cells do not reach full capacity on the first charge cycle — this is normal cell chemistry, not a defect. Rated capacity is typically reached after three to five full charge-discharge cycles. Each cycle, the crystal structure inside the cell becomes more uniform, allowing more charge to be stored. Run the handset to low battery, return it to the base for a full charge, and repeat — capacity increases with each pass.

Base station showing no charge or error light after swap

When a Ni-MH pack arrives from storage, its resting voltage can fall below the threshold the base station uses to confirm a valid battery is seated. The base reads this as an absent or faulty pack and refuses to begin charging. Remove the handset, leave the battery installed, and wait ten minutes before reseating — this allows the cell voltage to stabilise slightly. If the base still shows an error, connect the handset to a USB charging path if available, or confirm the pack reads at least 3.0V with a multimeter before reseating.

Compatible Models

3415 3420 3445 3455 3460 3474 5275

Replaces Part Numbers

IBM

Technical Specifications

Voltage3.6V
Amp Hours1500mAh
Capacity1500mAh
Rate5.4Wh
Net Weight76g /2.68 oz
Gross Weight126g /4.44 oz
Approximate Weight126g /4.44 oz
Dimension 50.00 x 42.00 x 14.00mm

Product Highlights

  • Brand: IBM
  • 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 IBM cordless handset shows a full charge but the battery drains completely overnight — what's wrong?

This is a standby draw issue, not a capacity fault. If the handset is not fully seated in the base, the charging contacts don't engage and the handset runs entirely off the battery while the display shows a charge icon. Check that the handset clicks firmly into the base cradle and that the charging indicator on the base lights up. If seating is confirmed and drain continues, clean the charging contacts on both the handset and cradle with a dry cloth — oxidation on either surface breaks the circuit.

The handset lost its pairing to the base after I swapped the battery — how do I fix it?

Some DECT cordless phones drop their pairing data when power is fully removed from the handset, because the pairing is stored in volatile memory backed by the battery. Reinstating the link requires a manual re-registration. Place the handset within one metre of the base, hold the base registration button for five seconds until the LED flashes, then follow the handset pairing prompt — the exact button sequence is in your IBM 3415 user guide under "Handset Registration."

Range dropped noticeably after the battery swap — the signal cuts out where it never did before?

Reduced range after a battery swap usually points to voltage sag under RF load. The DECT transmitter in the handset draws a sharp burst of current each time it sends a signal — if the Ni-MH pack is not yet fully conditioned, its internal resistance is higher and the voltage dips during that burst, causing the radio to drop out. Run three to five full charge-discharge cycles to condition the pack. After conditioning, test range again — if the problem persists, confirm the handset sits at or above 3.6V fully charged with a multimeter.

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