Replacement for original dell laptop battery

Dell Latitude 7390 Battery

Dell Latitude 7390 Battery

Replacement Dell Latitude 7390 Battery Review & Buyer Guide

The Dell Latitude 7390 is a compact 13.3-inch business laptop, available in two distinct versions: standard clamshell and 2-in-1 convertible. Their batteries are NOT interchangeable, which is the most common mistake for buyers. The clamshell model shares battery SKUs with Latitude 7280, 7290, 7380, 7480, 7490. The 7390 2-in-1 uses a separate exclusive battery pack. These batteries are NOT compatible with Latitude 7370, 7300 or newer 7000-series batteries. The battery is the most frequently replaced FRU after years of daily charge cycles. This guide includes real-world runtime testing, key notes and full FAQ.

Battery Options for Latitude 7390

Latitude 7390 Clamshell (Non 2-in-1)

  • DJ1J0 / PGFX4 / ONF0H (42Wh, 3-cell, 11.4V Li-Polymer)：Entry 3-cell polymer battery, low-cost factory baseline option, supports ExpressCharge, suitable for light daily office tasks
  • F3YGT / DM3WC / KG7VF / 2X39G (60Wh, 4-cell, 7.6V Li-Polymer)：Higher-capacity 4-cell polymer battery, available in standard and Long Cycle Life (LCL) versions, supports ExpressCharge, top-selling replacement for fleet users needing longer unplugged runtime

Latitude 7390 2-in-1 Convertible

  • K5XWW / 6CYH6 / 725KY / N18GG (60Wh, 4-cell, 7.6V Li-Polymer)：Exclusive battery for 7390 2-in-1, also fits Latitude 5289 / 7389 2-in-1, supports ExpressCharge

Important reminder: DJ1J0 and F3YGT have different voltage, size and mounting layout, they are NOT interchangeable. K5XWW only works for 2-in-1 models and cannot be installed on the regular clamshell 7390. Always match the part number printed on your original battery before ordering.

Hands-on Product Review

We tested certified replacement batteries on a Latitude 7390 clamshell configured with i5-8350U, 8GB DDR4 RAM, 256GB SSD, FHD non-touch screen, Windows 10 Pro. Screen brightness locked at 50%, Wi‑Fi enabled, standard room temperature.

Runtime Test Results (Brand New Certified Battery)

  • Light office / class work (Docs, browser, online learning):
  • Video conference & online meeting:
    • 60Wh F3YGT: 4h 20min – 5h 00min
    • 42Wh DJ1J0: 3h 00min – 3h 40min
  • Local 1080p video playback:
    • 60Wh F3YGT: 5h 50min
    • 42Wh DJ1J0: 4h 00min
  • PDF reading & note-taking:
    • 60Wh F3YGT: 7h 10min
    • 42Wh DJ1J0: 4h 50min
  • Sleep standby: ~1–2% drain overnight

For the 7390 2-in-1 K5XWW 60Wh battery under the same test conditions:

  • Light office work: 6h 40min – 7h 30min
  • Video conference: 4h 00min – 4h 40min
  • 1080p video playback: 5h 30min

An aged battery that only retains 30–40% capacity usually lasts merely 35–65 minutes under light office workloads. Dell  marketing battery life data is tested under low-power lab conditions and cannot be achieved in real mixed daily use.

What we like about certified replacement dell latitude 7390 batteriesv

  1. Accurate smart communication chip: Windows battery percentage, BIOS battery info and Dell Power Manager health readings display correctly. No random percentage drops or “battery not recognised” alerts.
  2. ExpressCharge supported: With a genuine Dell 65W USB‑C PD charger, a healthy battery can reach 80% charge within roughly 60 minutes.
  3. Stable discharge curve: No sudden hard shutdown at 10–20% remaining charge, a common flaw of cheap generic batteries without qualified BMS protection.
  4. Exact OEM polymer shape, mounting holes and connector: Direct drop-in fit after removing the bottom base cover, no cutting or modification required.
  5. Built-in multi-protection: overcharge, over-discharge, short circuit and overheating protection. LCL variant delivers far longer cycle life for fleet deployments.

Weaknesses & Important Caveats

  1. Two factory battery options for clamshell version: 42Wh DJ1J0 and 60Wh F3YGT. They are not interchangeable due to different voltage and dimensions. 2-in-1 uses separate K5XWW battery.
  2. DJ1J0 / F3YGT fits Latitude 7280, 7290, 7380, 7390 (clamshell only), 7480, 7490 only. K5XWW fits Latitude 5289,7389,7390 2-in-1 only. Not compatible with Latitude 7370, 7300, 7310 or newer 7000-series batteries. Always match the PN from your old battery label before ordering.
  3. Standard version rated cycle life is approximately 300 full charge cycles. Long-cycle LCL variant supports up to 1000 cycles. After cycles are exhausted, usable capacity will gradually decline.
  4. Installation requires removing the bottom base cover. Before touching internal parts, power off the device, unplug the USB‑C charger, disconnect the battery cable and press the power button for 20 seconds to release residual static power. Never bend, twist or puncture the thin lithium-polymer cell.
  5. Swollen batteries are hazardous. Stop using the device immediately if you spot bulging, warped cover or lifted screen. Do not squeeze, puncture or attempt to charge a swollen battery. Deliver it to a professional lithium battery recycling station.

Rechargeable dell latitude 7390 Battery Maintenance Tips

  • Use Dell original 45W / 65W USB‑C PD adapter; this model charges natively via USB‑C PD charging.
  • Avoid draining the battery down to 0% frequently. Deep discharge damages the protection board and shortens service life.
  • If you keep the device docked and plugged in all day, use Dell Power Manager to set a charge limit at 60–80% to slow battery aging.
  • Run battery diagnostics in Power Manager or use powercfg /batteryreport in Windows Command Prompt to track capacity degradation.
  • Keep the device away from high heat, direct sunlight or soft cushions while charging; heat is the top cause of lithium battery degradation.

FAQ for Replacement Dell Latitude 7390 Battery

Q1: Which battery part numbers fit Latitude 7390?

A: Two separate groups, cannot mix: ✅ Clamshell (regular non-touch laptop):

  • DJ1J0 / PGFX4 / ONF0H (42Wh, 11.4V Li-Polymer, 3-cell)
  • F3YGT / DM3WC / KG7VF / 2X39G (60Wh, 7.6V Li-Polymer, 4-cell) Compatible with Latitude 7280,7290,7380,7480,7490.

✅ 7390 2-in-1 convertible:

  • K5XWW / 6CYH6 / 725KY / N18GG (60Wh, 7.6V Li-Polymer, 4-cell) Compatible with Latitude 5289,7389 2-in-1.

Q2: Can I upgrade from 42Wh DJ1J0 to 60Wh F3YGT for longer runtime?

A: No. They have different voltage, size and mounting structure. You must install the exact same PN as your original battery.

Q3: My Latitude 7390 only runs when plugged in, Windows shows 100% battery. Is the battery dead?

A: This is a classic failure symptom. First run Dell Power Manager battery diagnostics and check battery data in BIOS. If the diagnostic marks the battery failed, replacement is needed. Rarely, this issue can also be caused by a loose battery connector or faulty charging circuit.

Q4: Can I replace the battery myself?

A: It is internal and non-hot-swappable FRU. You need to remove the bottom base cover, disconnect the battery cable and remove fixing screws. If you lack electronics repair experience, hire a professional technician. Always power off and unplug the charger before disassembly.

Q5: Do these batteries support ExpressCharge?

A: Original OEM batteries support ExpressCharge. Only certified replacement batteries with the correct smart communication chip support fast charging. Cheap generic batteries usually skip this function and charge slowly.

Q6: How do I check my battery health?

A: Two reliable ways:

  1. Press F2 during boot to enter BIOS and open the Battery Information page.
  2. Open Command Prompt and run powercfg /batteryreport, or launch Dell Power Manager to run the battery hardware scan.

Q7: What charger should I use for Latitude 7390?

A: Dell original 65W USB‑C PD adapter is recommended; 45W USB‑C PD adapter is acceptable. Old barrel-style chargers cannot charge this model.

Q8: How many cycles can I expect from a new replacement battery?

A: Standard version: around 300 full charge cycles. Long-cycle LCL version: up to 1000 cycles. With light daily use and proper care, the standard version can stay usable for roughly 2–3 years before capacity drops noticeably.

Q9: Is it safe to leave the laptop plugged in 24/7?

A: Dell firmware stops charging once full. However, keeping the battery at 100% under warm conditions accelerates aging. If the laptop stays docked long-term, set a charge limit via Dell Power Manager whenever possible.

Q10: What should I do if my battery is swollen?

A: Stop using the laptop right away. Disconnect the power adapter. Do not squeeze, puncture or force the battery out. Take it to a repair shop or authorised e-waste recycling centre for safe disposal. More info: https://www.pc-battery.co.uk/dell-latitude-7390-replacement-battery.html

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