About this replacement
Dell XPS 13 9343 — 7.4V Li-Polymer Replacement Battery (CN-0N7T6)
This 7.4V, 7300mAh (54.02Wh) lithium-polymer battery replaces the original cell in the Dell XPS 13 9343 ultrabook. It fits the 9343 chassis across all trim levels, including the XPS9343-1818SLV and XPS 13-9343 variants. OEM part numbers CN-0N7T6, JD25G, 90V7W, 5K9CP, and RWT1R all cross to this unit.
- XPS 13 9343 platform fit: Every 9343 variant uses the same 7.4V two-cell Li-Polymer pack with a unified connector and BMS handshake. The charge controller on this board talks to the cell EEPROM — swap the cell, and the BIOS reads the new pack's stored data on first boot.
- Bench tested on actual hardware: We ran this cell on a 9343 board and confirmed the BMS accepted the pack without fault codes. Charge current ramped correctly through CC and CV phases, and the board reported full capacity within two calibration cycles.
- Post-install calibration on the 9343: After fitting, discharge the laptop fully until it hibernates on its own, then charge uninterrupted to 100% without powering on mid-cycle. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting battery health as poor immediately after replacement
The XPS 13 9343 BIOS reads health data stored in the old cell's EEPROM and flags any new pack as degraded until it completes a learn cycle. This is a firmware behaviour, not a fault with the replacement cell. Run one full discharge to hibernate, then a full uninterrupted charge to 100%. After one or two cycles the BIOS recalibrates against the new cell and the health warning clears.
Laptop shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC still holds calibration data from the old, degraded cell. Under full CPU and display load the 9343 draws enough current to expose a voltage cliff the gauge did not anticipate — the board shuts down to protect the cell even though the reported percentage looks safe. The fix is a proper calibration cycle: discharge to hibernate cutoff, charge straight to 100%, repeat twice. After two full cycles the gauge IC maps the new cell's actual discharge curve and the premature shutdowns stop.