HTC R7 Tablet Replacement Battery BG41100 3.7V 3250mAh

HTC R7 — 3.7V Li-Polymer Replacement Battery (BG41100)

This is a 3.7V, 3250mAh lithium-polymer replacement battery for the HTC R7 tablet. It fits directly in place of the original BG41100 (also listed as 35H00148-00M). Capacity matches the factory specification at 12.03Wh.

• R7 tablet fit: The BG41100 uses a specific connector pinout and cell footprint tied to the R7 chassis. The BMS on this replacement matches the voltage rails and charge termination logic the R7 charge IC expects — no handshake errors during testing.
• Bench tested on actual hardware: We cycled this battery through full charge and discharge on the R7 platform. The BMS held charge termination correctly at 4.2V and triggered low-voltage cutoff cleanly without tripping any false shutdowns.
• Fuel gauge recalibration after install: After fitting this battery, run one full discharge to automatic shutoff, then charge uninterrupted to 100%. The R7 fuel gauge IC calibrates against actual cell capacity during this cycle — skipping it causes the percentage indicator to read inaccurately from day one.

HTC R7 shutting down at 15–25% remaining after battery replacement

This happens when the fuel gauge IC is still calibrated to the old, degraded cell. The R7 maps voltage curves from the previous battery, so it interprets a new cell's voltage profile as near-empty before it actually is. When the display and WiFi radio draw simultaneous load, voltage sags briefly — the IC reads that sag as a critical low and triggers an emergency cutoff. Run one complete discharge to automatic shutoff, then a full uninterrupted charge to 100% to remap the curve to the new cell.

Fast charging not available on the R7 after swapping the battery

The R7 charge controller uses a handshake protocol during the first accepted charge cycle to confirm cell chemistry and set the fast-charge current threshold. A brand-new cell hasn't completed that negotiation yet, so the device defaults to standard charge rates as a precaution. Plug into the original HTC charger — not a generic USB port — and allow one full charge to complete without interruption. Fast charge availability is confirmed once the controller logs the first successful cycle against the new cell at the correct termination voltage of 4.2V.