Dell Inspiron 14R 11.1V Replacement Battery 2NJNF 3900mAh
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Dell Inspiron 14R 11.1V Replacement Battery 2NJNF 3900mAh - is backordered and will ship as soon as it is back in stock.
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Battery Care Tips
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.
Delivery and Shipping
Delivery and Shipping
🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.
Disclaimer
Disclaimer
⚠️ 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.
Dell Inspiron 14R 11.1V Replacement Battery 2NJNF 3900mAh - is backordered and will ship as soon as it is back in stock.
Voltage
11.1V
Amp
3900mAh
Dell Inspiron 14R Series — 11.1V Li-Polymer Replacement Battery (2NJNF)
This 11.1V, 3900mAh (43.29Wh) Li-Polymer cell replaces the original battery in the Dell Inspiron 14R, Inspiron 14-3421, Inspiron 14-N3421, and Inspiron 14R-3421, plus a further twelve confirmed models. It carries OEM part numbers 2NJNF, 8JVDG, and TPMCF, so it slots into the same bay without any connector or voltage mismatch.
- Inspiron 14R family compatibility: These models share the same 11.1V three-cell architecture, identical 294.16 × 80.16 × 12.10mm footprint, and the same BMS handshake protocol. One cell swap covers the entire group without any wiring or firmware modification.
- Bench tested on actual hardware: We ran this cell on an Inspiron 14R-3421 under a mixed CPU and display load. The BMS held stable at 11.1V nominal, completed a full charge cycle without throttling, and passed the Windows battery report health check on the first cycle.
- BIOS learn cycle after swap: After fitting this cell, run one full discharge to the hibernate cutoff point, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell replacement on this platform.
BIOS reporting battery health as poor after fitting a new cell
Dell's BIOS reads health data stored in the old cell's EEPROM and compares it against the new cell's charge behaviour during the first few cycles. Until those cycles complete, the firmware flags the battery as degraded — even when the cell is brand new. This is not a fault with the replacement. Run one full discharge to hibernate cutoff, then a full uninterrupted charge to 100%. After that cycle, the BIOS recalibrates and the health warning clears on the next POST.
Laptop shuts down abruptly at 20–30% charge shown on screen
This happens when the fuel gauge IC still holds calibration data from the old, degraded cell. The reported percentage diverges from actual cell voltage, so the system cuts power before Windows can act on the low-battery signal. The fix is a calibration cycle: let the laptop discharge fully until it hibernates on its own, then charge without interruption to 100%. After two full cycles the fuel gauge IC re-maps against the new cell's voltage curve and the shutdowns stop. After calibration, the cutoff should not trigger above 10.2V under load.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Dell
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-Polymer
- Battery Type: Li-Polymer
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
Dell SupportAssist shows the wrong Wh rating for this replacement — is something wrong with the cell?
Nothing is wrong with the cell. SupportAssist reads the Wh value stored in the battery's EEPROM, and that value is set at the factory based on the rated chemistry spec, not measured against the exact cell installed. The 43.29Wh figure in the product data is accurate for this cell. If the number shown differs slightly, disregard it — the discrepancy is in the EEPROM metadata, not the actual capacity.
The fuel gauge jumps around wildly for the first few charges — showing 80%, then 45%, then 90% within minutes.
The fuel gauge IC is still running its algorithm against the old cell's discharge curve stored in memory. It has not yet mapped the new cell's voltage behaviour. Run two complete discharge-to-hibernate then full-charge cycles without interrupting them. After the second cycle the IC recalibrates against the new cell and the percentage readings stabilise.
New battery installed but charge stops at 80% and won't go higher — laptop just sits at 80% indefinitely.
Dell's BIOS includes a firmware-controlled charge limit that caps charging at 80% when "Primary AC Use" or a similar battery conservation mode is active. This is a BIOS setting, not a fault with the replacement cell. Open Dell SupportAssist or go to BIOS Setup (F2 at boot) → Power Management → Primary Battery Charge Configuration and switch it to "Standard" or "Adaptive." Charge will then proceed to 100%.
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