ParTner EM-100 Tablet Replacement Battery 3.7V 7600mAh

ParTner EM-100 — 3.7V Li-Polymer Replacement Battery (21 1602 1114 001)

This 3.7V, 7600mAh lithium-polymer battery replaces the original cell in the ParTner EM-100 tablet. It matches the OEM part number 21 1602 1114 001 and fits the EM-100 form factor directly. Capacity is 28.12Wh — sourced to match the original cell specification.

• EM-100 platform fit: The ParTner EM-100 uses a single-cell Li-Polymer configuration with a dedicated fuel gauge IC that tracks charge state. Voltage, connector pinout, and cell dimensions — 106.80 x 93.20 x 6.30mm — match the original, so the charge IC communicates with the new cell without modification.
• Bench tested on actual hardware: We ran charge and discharge cycles on the EM-100 platform to confirm the BMS accepted the new cell without triggering a protection cutoff. Charge termination occurred cleanly at full voltage with no fault flags logged.
• Fuel gauge recalibration after swap: After installation, run the tablet down to automatic shutoff, then charge uninterrupted to 100%. This gives the fuel gauge IC one full reference cycle against the new cell and corrects the inaccurate percentage readings that typically appear immediately after a battery swap.

ParTner EM-100 shutting down at 15–25% remaining

The EM-100's fuel gauge IC was calibrated to the old, degraded cell. When a new cell is installed, the IC's discharge curve model no longer matches the actual cell chemistry, so it miscalculates the cutoff point. The display backlight combined with active Wi-Fi creates a combined load spike that the IC reads as a voltage cliff — triggering shutdown before the cell is actually depleted. Run one full discharge to automatic shutoff followed by an uninterrupted charge to 100% to force the IC to re-map the discharge curve against the new cell. After one complete cycle, the shutdown threshold should stabilise above 5%.

Fast charging not available on EM-100 after battery replacement

Fast charge on the EM-100 depends on the charge IC completing a successful USB-PD negotiation handshake — and that handshake references the battery's charge state data. On the first cycle with a new cell, the IC defaults to standard charge rate as a safety measure until it has one accepted cycle on record. This is not a fault with the replacement cell. Charge the tablet fully at standard rate once, then reconnect to a USB-PD charger — fast charge capability will resume from the second cycle onward.