EAC61998402 Verizon ENACT Replacement Battery 3.8V 2300mAh

Verizon ENACT / Lucid 2 / VS870 — 3.8V Li-ion Replacement Battery (EAC61998402)

This 3.8V, 2300mAh lithium-ion battery replaces part numbers EAC61998402 and BL-59JH on the Verizon ENACT, Lucid 2, and VS870 smartphones. It fits devices where the original cell has degraded through repeated charge cycles and can no longer sustain voltage under normal screen and modem load. Capacity figure is 8.74Wh as measured at the cell level.

• ENACT, Lucid 2, and VS870 compatibility: These three models share the same physical footprint, connector pinout, and BMS handshake protocol — all three accept the EAC61998402 cell without modification. The fuel gauge IC on each platform reads the same charge curve, so no firmware differences affect calibration between models.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the VS870 platform and monitored BMS cutoff behaviour at both ends of the voltage range. The protection circuit tripped correctly at the low-voltage threshold and accepted a full charge without thermal events or premature termination.
• Fuel gauge recalibration on first use: Disable fast charging for the first complete discharge-charge cycle after installation. The fuel gauge IC on the ENACT series is calibrated to the old cell's discharge curve — running one slow cycle at standard charge rate lets the coulomb counter relearn the new cell's characteristics before high-current charging is applied.

Why the ENACT reports wrong battery percentage after a cell swap

The ENACT uses a coulomb counter in the fuel gauge IC that builds its percentage model around the discharge curve of the original cell. When a new cell goes in, that stored curve no longer matches actual cell behaviour — the IC reports stale data until it recalculates. This shows up as percentages that jump or plateau unexpectedly, especially in the 40–70% range where the old cell's curve diverged most from a fresh cell. One full slow discharge down to automatic shutdown, followed by a complete charge to 100%, forces the IC to write a new reference curve. After that cycle, reported percentage tracks actual cell state accurately.

Sudden shutdown at 20–30% on the replacement cell

This is a voltage cliff problem, not a capacity problem. Under high instantaneous load — LTE radio, screen at full brightness, GPS active simultaneously — the cell voltage drops faster than the fuel gauge IC expects based on its current curve. When cell voltage sags below the BMS low-voltage threshold, the protection circuit cuts power even though the reported percentage still reads 20–30%. The fix is completing the recalibration cycle described above: one full discharge to shutdown at standard charge rate, then a full charge to 100%. Once the coulomb counter has a fresh discharge curve for this cell, it adjusts the low-percentage window and the shutdowns stop.