Lenovo Tab 4 L16D1P34 Replacement Battery 3.85V 4850mAh

Lenovo Tab 4 — 3.85V Li-Polymer Replacement Battery (L16D1P34)

This is a 3.85V, 4850mAh lithium-polymer battery for the Lenovo Tab 4 tablet. It fits models TB-8504F, ZA2B0009US, and related Tab 4 variants sharing the L16D1P34 part number. Capacity figures come from the product data — 18.67Wh total.

• Tab 4 platform compatibility: These Tab 4 variants share the same battery footprint, connector pinout, and BMS communication protocol. Swapping between models in this family requires no rewiring — the charge IC handshake is identical across TB-8504F and ZA2B0009US units.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a TB-8504F unit. The BMS accepted the cell without fault flags, charge termination triggered correctly at full voltage, and low-voltage cutoff engaged within expected range under display-plus-WiFi load.
• Fuel gauge recalibration after swap: After installing this battery, run the tablet down to automatic shutoff, then charge it uninterrupted to 100% without using the device. This single full cycle resets the fuel gauge IC against the new cell's actual capacity curve and clears the inaccurate percentage readings that commonly appear right after a replacement.

Lenovo Tab 4 shutting down between 15–25% remaining

This happens because the Tab 4's fuel gauge IC was calibrated to the old, degraded cell. When the voltage curve of the new cell doesn't match what the IC expects at low charge states, the system triggers an emergency shutdown before the battery is actually empty. The display and WiFi radio together create a combined load spike that accelerates the apparent voltage drop. Run one full discharge-to-shutoff cycle followed by an uninterrupted charge to 100% — after that cycle, the IC recalibrates and shutdowns at low percentage stop.

Fast charging not available after battery replacement on Tab 4

The Tab 4's charge controller uses a handshake with the charger over the USB connection to negotiate fast-charge voltage. On a fresh cell, the BMS sometimes rejects the elevated charge rate until it has completed at least one accepted standard charge cycle. Plug in with the original Lenovo charger, let it complete a full charge at standard rate without interruption, then disconnect and reconnect. After that cycle, fast-charge negotiation typically resumes at the expected rate.