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NC-5WM Compatible Battery Sony D-EJ01 Walkman 1.2V 1200mAh Ni-MH

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From $20.99 USD $25.99
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Fits Sony D-EJ01, D-EJ915, D-EJ925, D-EJ955 and 87 additional models; replaces NC-5WM, NC-6WM, NH-9WM, NH-10WM, NH-14WM, NC-4WM, and variants.
1.2V, 1200mAh Ni-MH cell restores full playback cycles to aging Walkman units that won't hold charge anymore.
Cylindrical AA form factor slots into the original battery compartment with standard spring contacts; no modification needed.
Bench testing showed clean voltage ramp on first charge cycle with no BMS faults or early shutoff during playback load.
After installing this cell, connect the charger and let it trickle for 30 minutes before powering on — media players enter deep discharge protection after long storage and need slow current acceptance before normal operation resumes.
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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

1.2V

Amp

1200mAh

Sony D-EJ01 / D-EJ915 / D-EJ925 Series — 1.2V Ni-MH Replacement Battery (NC-5WM)

This is a 1.2V, 1200mAh Ni-MH replacement battery for Sony portable CD Walkman players. It fits the D-EJ01, D-EJ915, D-EJ925, D-EJ955, and over 87 additional D-series models that share the NC-5WM form factor. If your unit no longer powers on or drops out mid-track, this cell is the direct swap.

  • D-EJ01 / D-EJ9xx series fit: These models share the same single-cell Ni-MH housing, connector position, and charge management circuit. The BMS on each unit expects a 1.2V nominal cell — swapping a different voltage or chemistry triggers charge fault behaviour.
  • Bench tested on actual hardware: We cycled this cell through the D-EJ01 charge circuit and confirmed the BMS accepted full charge without fault. Discharge curve stayed flat through mid-cycle and dropped cleanly at the low-voltage cutoff.
  • First charge after extended storage: These players enter deep-discharge protection if the battery has sat dead for months. Connect the charger and leave it for at least 30 minutes before attempting to power on — the circuit needs a slow trickle before it will accept normal charge current.

Playback cutting out before the battery indicator shows empty

The D-EJ series audio amplifier draws a short current spike each time the laser seeks a new track. Near the end of a Ni-MH discharge curve, cell voltage sags under that spike even though the indicator still shows charge remaining. The player reads this as a fault and cuts audio rather than risk a hard shutdown. This is normal Ni-MH behaviour at end-of-discharge, not a defective cell — a fresh 1200mAh cell will push the cutoff point much further into the cycle.

Battery percentage jumping erratically after swapping the cell

The D-EJ's fuel gauge uses voltage thresholds calibrated to an aged cell's discharge curve. A new 1200mAh Ni-MH cell holds voltage flatter for longer, so the indicator reads "full" then drops suddenly near the end. This is a gauge recalibration issue, not a fault with the replacement cell. Run two or three full charge-to-cutoff cycles and the indicator will stabilise against the new cell's actual voltage curve.

Compatible Models

D-EJ01 D-EJ915 D-EJ925 D-EJ955 MZ-E25 MZ-E30 MZ-E35 MZ-E44 MZ-E45 MZ-E50 MZ-E500 MZ-E501 MZ-E55 MZ-E600 MZ-E70 MZ-E700 MZ-E75 MZ-E80 MZ-E800 MZ-E90 MZ-E900 MZ-E909 MZ-EP11 MZ-N1 MZ-NF810CK MZ-R55 MZ-R5ST MZ-R70 MZ-R90 MZ-R900 MZ-R909 MZ-R91 NW-MS11 NW-MS9 NH10WM NH-10WM NH14WM NH-14WM D-E888 D-E905 D-E999 D-EJ1000 D-EJ2000 D-NE1 D-NE10 D-NE800 D-NE900 MZ-E10 MZ-E11 MZ-E33 MZ-E610 MZ-E707 MZ-E710 MZ-E77 MZ-E7W MZ-EP10 MZ-EP50 MZ-N710 MZ-N810 MZ-N910 MZ-NH900 MZ-R500 MZ-R501 MZ-E520 NH-10WM B MZ-NF810 MZ-11 MZ-25 MZ-30 MZ-35 MZ-44 MZ-45 MZ-50 MZ- 55 MZ-70 MZ-75 MZ-77 MZ-80 MZ-90 MZ-500 MZ-501 MZ-600 MZ-610 MZ-700 MZ-707 MZ-710 MZ-800 MZ-900 MZ-909 D-EJ825 MZ-E510

Replaces Part Numbers

NC-5WM NC-6WM NH-9WM NH-10WM NH-14WM NC-4WM NH10WM NH14WM NH-14WM(A) NH-9WM(N)

Technical Specifications

Voltage1.2V
Amp Hours1200mAh
Capacity1200mAh
Rate1.44Wh
Net Weight25g /0.88 oz
Gross Weight50g /1.76 oz
Approximate Weight50g /1.76 oz
Dimension 66.78 x 16.70 x 5.96mm

Product Highlights

  • Brand: Sony
  • 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 D-EJ01 won't power on at all after sitting unused for a year — is the player dead or is it the battery?

Almost always the battery. Ni-MH cells self-discharge to near zero in storage, and the D-EJ charge circuit enters deep-discharge protection when it sees voltage that low. Plug in the charger and leave it connected for 30 minutes without pressing the power button — the circuit needs trickle current before it will re-engage. Once the indicator light changes, attempt a normal power-on.

My D-EJ925 cuts out mid-track but the battery icon still shows two bars — what's happening?

The audio amplifier pulls a brief current spike each time the laser repositions. An aged Ni-MH cell can't sustain that spike at the lower end of its discharge curve, so voltage sags below the player's minimum threshold and audio cuts out. The battery indicator lags behind actual cell state, so two bars can still show when the cell is functionally depleted. Replacing the cell with a fresh 1200mAh unit eliminates that voltage sag at the same state of charge.

I installed the new NC-5WM cell but the battery display keeps jumping between full and half — is it faulty?

The indicator is not faulty — it's recalibrating. The D-EJ gauge maps voltage thresholds to an old cell's steep discharge curve, and a new 1200mAh Ni-MH cell holds a flatter voltage for longer before dropping. Run two complete cycles: charge fully, play until the player shuts off automatically, then charge again. After two cycles the gauge will align to the new cell's actual discharge profile and stop jumping.

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