Replace the Battery on Dell XPS 13 (9340/9345/9350/9320) — Step-by-Step DIY Guide for MN79H / 0MN79H

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Models covered: XPS 13 9340, XPS 13 9345, XPS 13 9350, XPS 13 9320. Battery type: MN79H / 0MN79H, DP/N: NXRKW, J7H5M.

Quick Summary & Jump Links

1) Recognize Battery SymptomsWhat users typically notice first
2) Battery Problem Diagnosis ChecklistTick boxes & auto alert
3) Verify with Windows & LED StatusSoftware + charge light behavior
4) Confirm the Correct Replacement PartMN79H / 0MN79H
5) Tools, Safety & PrepWhat you need before opening
6) Remove the Base CoverT5 screws & pry safely
7) Remove the Old BatteryDisconnect & lift under 30°
8) Install New Battery + ReassembleScrew torque & order
9) First Boot & Battery CalibrationMaximize lifespan
10) FAQ & TroubleshootingCommon issues solved

Dell XPS 13 Replacement Battery MN79H 55Wh product image

Recommended Replacement: Dell XPS 13 55Wh Battery (MN79H / 0MN79H)

Direct fit for XPS 13 9340 / 9345 / 9350 / 9320. Official DP/N references: NXRKW, J7H5M. High-capacity 55Wh Li-ion.

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1) What You’ll Notice When Your XPS 13 Battery Needs Replacement

  • Rapid drain (e.g., drops from 40% to 15% in minutes) or random shutdowns under light loads.
  • Battery Wear Level > 25–30% reported by Windows or third-party tools even after calibration.
  • “Plugged in, not charging” or charge stuck at a fixed percentage despite AC power.
  • Unexpected thermal throttling or performance dips when on battery only.
  • Swollen battery signs: trackpad clicks unevenly, palmrest bulging, chassis gaps—stop using and replace immediately.
  • LED charge light amber <10% despite recent charging (see status light table below).
  • Cycle count very high (commonly > 500) or Windows battery report shows degraded full-charge capacity.
Safety: If you suspect swelling or smell a sweet/chemical odor, power down now, disconnect AC, and proceed with replacement.
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2) Battery Problem Diagnosis Checklist

Tick the issues you’re experiencing. If you check 2 or more</strong), you should replace the battery.








0 issue(s) selected.
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3) Verify with Windows Report & XPS 13 Charge-Status Light

Windows Battery Report (Quick)

  1. Press Win + X → Windows PowerShell (Admin).
  2. Run: powercfg /batteryreport /output %USERPROFILE%\Desktop\battery-report.html
  3. Open the report from your Desktop and compare Full charge capacity vs Design capacity.

Charge & Status Light Behavior (XPS 13 9340)

Power Source LED Behavior System Power State Battery Charge Level
AC Adapter Off S0 – S5 Fully Charged
AC Adapter Solid White S0 – S5 < Fully Charged
Battery Off S0 – S5 11–100%
Battery Solid Amber (590±3 nm) S0 – S5 < 10%

S0 (ON): computer on. S4 (Hibernate): lowest power sleep, context saved to storage. S5 (OFF): shutdown state.

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4) Confirm Compatibility: The Correct Replacement for Your XPS 13

  • Battery Type: MN79H / 0MN79H
  • Dell DP/N (part numbers): NXRKW; J7H5M
  • Capacity / Chemistry: 55Wh, Rechargeable Li-ion, 11.55V, 3-cell
  • Supported Systems: XPS 13 9340, 9345, 9350, 9320

Shop the recommended replacement here: Dell XPS 13 55Wh Battery (MN79H).

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5) Tools, Safety & Preparation

Tools: Torx T5 screwdriver; small Phillips #0; plastic pry tool; ESD strap (recommended); small container for screws.
Power & Data Safety: Back up your files. Shut down Windows completely. Unplug AC. Press and hold the power button for 10 seconds to drain residual power.

If your device is under warranty or you’re not comfortable working inside a laptop, consult a professional.

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6) Removing the Base Cover

Note: Ensure your computer is fully shut down.

  1. Remove the six screws (M2×3, Torx T5) securing the base cover to the palm-rest and keyboard assembly. Use T5
  2. Place your thumbs and fingers into the recess at the top edge of the base cover.
  3. Use both thumbs to gently pry the base cover to release it from the palm-rest and keyboard assembly.
    Do not pry near the display hinges to avoid damage.
  4. Move your hands to both sides and lift the base cover off.
Dell XPS 13 9340 base cover – screw locations and starting point
Figure 1. Removing the base cover (view 1)
Dell XPS 13 9340 base cover – prying technique at the top edge
Figure 2. Removing the base cover (view 2)
Dell XPS 13 9340 base cover – safe lift-off angle
Figure 3. Removing the base cover (view 3)
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7) Removing the Battery

  1. Loosen the captive screw (M1.6×2) that secures the battery-connector bracket to the system board.
  2. Unhook and lift the battery-connector bracket off the board.
  3. Use the pull tab on the battery power cable to disconnect it from the board connector.
  4. Remove the six screws (M1.6×2.5) securing the battery to the palm-rest and keyboard assembly.
  5. Use the pull tab to lift the battery slightly from its top edge, releasing it from the two hooks at the bottom edge.
  6. Important: Do not lift the battery at more than a 30° angle to avoid damage.
  7. Slide the battery toward the back and lift it out.
Dell XPS 13 9340 battery location with screws highlighted
Figure 1. Battery location and screws
Dell XPS 13 9340 battery connector and bracket
Figure 2. Battery connector and bracket
Close-up of battery-connector bracket removal on XPS 13 9340
Figure 3. Battery-connector bracket
Proper battery lifting angle under 30 degrees on XPS 13 9340
Figure 4. Lift the battery at an angle less than 30°
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8) Installing the New Battery (MN79H / 0MN79H)

  1. Align the new battery with the bottom hooks and slide it into place.
  2. Install the six battery screws (M1.6×2.5). Do not overtighten.
  3. Reconnect the battery power cable firmly and reinstall the connector bracket; tighten the captive screw (M1.6×2).
  4. Reinstall the base cover and secure the six T5 screws (M2×3).
  5. Connect AC power and perform a first boot.
Tip: If the system does not power on immediately, hold the power button for 10–12 seconds to clear residual states, then try again with AC connected.
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9) First Boot & Battery Calibration (Best Practice)

  1. Charge to 100% and keep charging for an additional 30–60 minutes.
  2. Unplug and use the laptop down to about 10–15% without heavy loads.
  3. Shut down and recharge back to 100%. This helps the battery gauge learn the new pack’s capacity.
  4. Repeat once a month if your usage is mostly on AC.

Avoid deep discharges to 0% and extreme heat to maximize lifespan.

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10) FAQ & Troubleshooting

My XPS shows “Plugged in, not charging”. Is it always the battery?

No. Check your original AC adapter and USB-C/adapter wattage, and look for bent pins or damaged cables. If the issue persists with a good adapter, the battery is a likely cause.

Do I need to enable any “Service Mode”?

No special software mode is required for the steps above. Fully power off and disconnect AC. Handle components carefully and observe ESD precautions.

After installation, Windows still reports low full-charge capacity.

Run the calibration steps. If the value remains low after several cycles, check connections and consider BIOS/driver updates. Persistent issues can indicate a defective pack—contact the seller for support.

Can I continue to use a slightly swollen battery?

No. Stop using the device, remove AC power, and replace the battery immediately to prevent damage to the trackpad and chassis.

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What This Guide Covers (At a Glance)

  • Dell XPS 13 models: 9340, 9345, 9350, 9320
  • Battery type: MN79H / 0MN79H; DP/N: NXRKW; J7H5M
  • Specs: 55Wh 11.55V 3-cell Li-ion
  • Steps: base cover removal, battery disconnection, safe lift (<30°), installation, calibration

Purchase link: Dell XPS 13 MN79H / 0MN79H 55Wh


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