About this replacement
Dell Chromebook 3400 / 5400 Series — 11.4V Li-Polymer Replacement Battery (P90F / YRDD6)
This is an 11.4V, 3400mAh (38.76Wh) Li-Polymer replacement battery for the Dell Chromebook 3400, 5488, 5493, and 5593, plus over 200 additional Dell Chromebook and Inspiron models. It replaces OEM part numbers P90F, YRDD6, WDX0R, 3CRH3, and related variants. If the original cell is failing to hold a charge or the system reports degraded battery health, this is the direct cell replacement.
- Chromebook 3400 and 5400 series fit: These models share the same 11.4V three-cell Li-Polymer architecture, identical connector pinout, and the same BMS handshake protocol used by Dell's EC firmware — one cell design covers the full range listed above.
- Bench tested on actual hardware: We cycled this cell on a Chromebook 3400 and confirmed the BMS handshake completed, the EC accepted the cell without fault codes, and charge accepted cleanly across all three cells without voltage imbalance at the pack level.
- Post-install calibration on Dell Chromebook: After fitting this cell, run the system down to automatic hibernate-cutoff, then charge uninterrupted to 100% without interruption. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap.
BIOS reporting poor battery health immediately after fitting a new cell
The Dell EC reads battery health from EEPROM data stored in the old pack's fuel gauge IC — not from live cell measurements. When a new cell goes in, the EEPROM slate is blank or shows a different charge history, so the system flags it as degraded before a single cycle runs. This is not a fault with the replacement cell. One full discharge-to-hibernate followed by an uninterrupted charge to 100% resets the learn cycle. After two or three full cycles, the health indicator will reflect actual cell condition.
Chromebook 3400 shutting down at 20–30% charge shown on screen
This is a voltage cliff failure — when CPU load and display backlight draw simultaneously, the cell voltage drops faster than the fuel gauge IC can track. The EC sees the pack voltage fall below the 10.5V cutoff threshold and shuts the system down even though the gauge still reads 20–30%. It happens most often on degraded cells or cells that have not completed a learn cycle. Run one full calibration cycle from hibernate-cutoff to 100%, and the fuel gauge IC will recalibrate its discharge curve against the actual cell chemistry. If shutdown continues below 15% after three cycles, check that cell voltage at the connector reads above 11.0V under load.