Dell Inspiron 3135 Replacement Battery 11.4V 4300mAh CGMN2
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Dell Inspiron 3135 Replacement Battery 11.4V 4300mAh CGMN2 - 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 3135 Replacement Battery 11.4V 4300mAh CGMN2 - is backordered and will ship as soon as it is back in stock.
Voltage
11.4V
Amp
4300mAh
Dell Inspiron 3135 Series — 11.4V Li-ion Replacement Battery (CGMN2)
This is an 11.4V, 4300mAh (49.02Wh) Li-ion battery for the Dell Inspiron 3135 and related 11-series notebooks. It fits the Inspiron 11-3137, 11-3138, and 11-3197 alongside the 3135. The OEM part numbers CGMN2, N33WY, NYCRP, and 0CGMN2 all cross-reference to this cell.
- Inspiron 11 3000-series fit: These models share a common 11.4V three-cell architecture and the same P19T board connector. The BMS handshake protocol is identical across P19T001, P19T002, and P19T003 variants, so one cell covers the full range without firmware conflicts.
- Bench tested on actual hardware: We ran this cell on a P19T002 board and confirmed full charge acceptance, accurate state-of-charge reporting, and clean BMS communication throughout the cycle. No trip events or cell-rejection flags appeared during testing.
- Post-install calibration: After fitting this battery, run the laptop down to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on Dell Inspiron systems.
BIOS reporting poor battery health immediately after fitting a new cell
Dell's BIOS reads EEPROM data embedded in the battery controller to assess health. When a new cell is installed, that EEPROM carries factory default values the BIOS hasn't yet validated against real charge cycles. The firmware flags this as degraded health until it completes a learn cycle. Run one full discharge to hibernate, then a full uninterrupted charge — the BIOS re-evaluates and the warning clears.
Laptop shuts down abruptly at 20–30% charge shown
This is a voltage cliff issue, not a capacity fault. Under combined CPU and display load, cell voltage drops faster than the fuel gauge IC can track, and the system hits the low-voltage cutoff before the reported percentage reaches zero. The gauge IC needs two or three calibration cycles against the new cell to map the discharge curve accurately. Run full discharge-to-hibernate cycles until the shutdown point tracks closer to 5% — on Dell Inspiron hardware this typically stabilises by the third cycle.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Dell
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
Why does Dell SupportAssist show the new battery as "unknown" or 0% health right after I installed it?
The BIOS reads EEPROM data stored in the battery controller to calculate health. A fresh cell carries factory default values that the BIOS hasn't validated yet, so it flags the battery as unknown or degraded. This isn't a fault — it clears after the BIOS completes a learn cycle. Discharge fully to hibernate cutoff, charge uninterrupted to 100%, and SupportAssist will re-read the cell correctly.
The Wh rating in Dell's battery report shows something different from the 49.02Wh listed in the specs — is the battery wrong?
The figure in Dell's system report pulls from the EEPROM's rated design capacity, which can differ from the actual measured chemistry capacity. The two numbers reflect different reference points — rated spec versus bench-measured output. Neither value means the battery is faulty. After one or two full charge cycles, the fuel gauge IC recalculates against real cell data and the reported figure settles closer to the actual capacity.
The fuel gauge jumps from 60% to 85% and back while the laptop is just sitting idle — what's happening?
The fuel gauge IC on the Inspiron 11 series uses a coulomb-counting algorithm that needs to learn the discharge curve of the specific cell installed. With a new cell, it hasn't mapped the voltage-to-capacity relationship yet, so the percentage reading oscillates. This is a calibration gap, not a wiring or cell fault. Run two to three full discharge-to-hibernate and full-charge cycles and the gauge IC will lock onto the correct curve.
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