About this replacement
Dell Venue 8 Pro 5855 — 3.8V Li-Polymer Replacement Battery (HH8J0)
This 3.8V, 5100mAh Li-Polymer battery replaces the original HH8J0 cell in the Dell Venue 8 Pro 5855 tablet. It fits the 8-inch Windows tablet directly, restoring full portable operation when the original cell no longer holds charge. Voltage, connector, and physical dimensions match the OEM spec.
- Venue 8 Pro 5855 fit: The 5855 uses a flat Li-Polymer pouch cell with a dedicated BMS that communicates charge state to Windows. This replacement uses the same connector pinout and cell dimensions (105.62 × 97.33 × 4.54mm), so the BMS handshake completes on first boot.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on the 5855 platform. The BMS accepted the new cell without fault flags, and Windows reported charge state within normal parameters after one full calibration cycle.
- Fuel gauge recalibration after swap: After fitting this battery, discharge the tablet fully until Windows shuts it down automatically, then charge uninterrupted to 100%. This forces the fuel gauge IC to remap its capacity curve against the new cell and eliminates the inaccurate percentage readings common after a swap.
Tablet shutting down at 15–25% remaining after battery replacement
This happens because the fuel gauge IC is still calibrated to the old cell's voltage curve. The new cell hits a voltage cliff under combined display and WiFi load before the gauge reaches zero. Windows interprets the sudden voltage drop as an emergency cutoff. Run one full discharge to automatic shutdown, then charge to 100% without interruption — this resets the calibration and the premature cutoffs stop.
Fast charging unavailable after battery swap on Venue 8 Pro 5855
The 5855 charge IC negotiates charge rate after it reads the new cell's acceptance parameters on the first cycle. Until that first full charge completes, the controller defaults to a conservative rate as a precaution. This is not a fault — it clears after one accepted charge cycle from near-empty to 100%. Plug into the original Dell charger for that first cycle, not a generic USB adapter.