About this replacement
Lenovo Tab4 8 Series — 3.85V Li-Polymer Replacement Battery (L16D1P34)
This is a 3.85V, 4750mAh Li-Polymer replacement battery for the Lenovo Tab4 8 and Tab4 8 Plus tablets. It fits models TB-8704X and TB-8504X, among others. It replaces OEM part number L16D1P34 directly.
- Tab4 8 and 8 Plus platform fit: Both the standard Tab4 8 and the 8 Plus share the same battery bay dimensions, voltage rail, and connector pinout. The L16D1P34 part number covers both variants, so one SKU covers the full platform without modification.
- Bench tested on actual hardware: We cycled this battery through charge and discharge on a TB-8504X unit. The BMS accepted charge from the first cycle, voltage held steady across the display and Wi-Fi load combined, and no overcurrent trip was triggered during start-up draw.
- Fuel gauge reset after installation: After fitting this battery, run the tablet down to automatic shutoff once, then charge uninterrupted to 100%. This forces the fuel gauge IC to recalibrate against the new cell's actual capacity curve and clears the inaccurate percentage readings that appear immediately after a swap.
Tablet shutting down between 15–25% after battery replacement
This happens because the fuel gauge IC is still calibrated to the old cell's voltage-to-capacity curve. When the display and Wi-Fi draw current simultaneously, voltage dips sharply in the 15–25% range. The IC reads that dip as a critically low cell voltage and triggers an emergency shutdown. One full discharge-to-shutoff cycle followed by a complete charge resets the calibration. After that cycle, the tablet should reach below 10% before any shutoff occurs.
Fast charging unavailable after swapping the L16D1P34
Fast charge on the Tab4 8 platform depends on a successful USB-PD or proprietary charge protocol handshake between the charger and the charge IC on the new cell. On first connection, the IC may default to standard 5V charging while it completes the negotiation. Disconnect and reconnect the charger after the tablet has been on charge for two to three minutes. If fast charge still does not activate, complete one full charge cycle — the protocol is accepted reliably from the second cycle onward.