RCA RCT6203W46 10" Tablet Replacement Battery MH49370 3.7V 4200mAh

RCA RCT6203W46 — 3.7V Li-Polymer Replacement Battery (MH49370)

This 3.7V 4200mAh Li-Polymer battery replaces the MH49370 cell in the RCA RCT6203W46 7-inch Android tablet. It fits directly into the existing battery bay and connects to the same ribbon connector used by the original cell. Capacity is 4200mAh — use the product data figure, not third-party listings that often overstate it.

• RCT6203W46 fit note: The RCT6203W46 uses a single-cell Li-Polymer pack at 3.7V nominal. The BMS on the tablet's logic board monitors cell voltage directly — swapping to a cell outside that voltage window triggers immediate low-battery shutdown. This cell sits within that window and clears the BMS handshake on first boot.
• Bench tested on actual hardware: We ran this cell through a full charge cycle on the RCT6203W46 board. The charge IC accepted the cell without fault flags, and the BMS terminated charge cleanly at 4.2V. No thermal anomalies appeared during the cycle.
• Fuel gauge reset after installation: After fitting this cell, run the tablet down to automatic shutoff, then charge uninterrupted to 100%. This single full cycle forces the fuel gauge IC to recalibrate against the new cell's actual capacity curve and clears the inaccurate percentage readings that almost always appear after a battery swap.

Why the RCT6203W46 shuts down at 15–25% remaining

The RCT6203W46 runs its display and WiFi radio off the same voltage rail. Under combined load, cell voltage sags faster than the fuel gauge IC can track. The tablet's low-voltage cutoff trips before the reported percentage hits zero — so the screen goes dark while Android still shows charge remaining. This is a voltage sag issue, not a faulty cell. After a full recalibration cycle, the fuel gauge adjusts its discharge curve to match the new cell and the early shutoffs stop.

Fast charging not available after battery swap on the RCT6203W46

The RCT6203W46 charge IC negotiates charge rate during the first accepted charge cycle on a new cell. Until that cycle completes, the IC defaults to a conservative current limit — which shows up as slow charging or no fast-charge indication. This is not a wiring fault. Complete one full uninterrupted charge to 100% and the IC registers the new cell, then resumes normal charge rate on the next cycle.