Samsung Galaxy S4 Zoom LTE B740AE Replacement Battery 3.8V 2100mAh

Samsung Galaxy S4 Zoom — 3.8V Li-ion Replacement Battery (B740AE)

This 3.8V, 2100mAh Li-ion cell replaces the original B740AE battery in the Samsung Galaxy S4 Zoom and SM-C101 / SM-C1010 variants. The S4 Zoom runs a combined smartphone and 10x optical zoom camera platform off one cell, which accelerates wear compared to a standard handset. Swap this in when the original no longer carries the device through a day of mixed shooting and calls.

• SM-C101 and SM-C1010 platform fit: Both the standard S4 Zoom and the LTE variant share the same battery bay geometry, connector pinout, and BMS communication protocol — the B740AE fits both without modification.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the SM-C101 body. The BMS accepted the cell on first insertion, reported state-of-charge correctly, and held the protection cutoff at the expected low-voltage threshold.
• First-cycle conditioning on the S4 Zoom: Charge this cell fully inside the camera body before heavy shooting. The S4 Zoom's BMS calibrates its battery-percentage display against the first full charge cycle — skipping this step can cause the indicator to show inaccurate remaining charge for the first several uses.

Why the S4 Zoom drains a cell faster than a standard Galaxy S4

The S4 Zoom packs an optical zoom mechanism, a dedicated image processor, and optical image stabilisation into the same chassis that runs Android. All three draw from the same 2100mAh cell simultaneously during shooting. The zoom motor alone pulls a burst of current each time the lens extends or retracts. Add continuous autofocus and the rear display, and peak draw during active shooting is significantly higher than during normal phone use — even though the rated capacity is identical to many standard smartphone batteries of the same era.

Battery percentage jumping or freezing on the S4 Zoom display

This happens when the BMS has not yet mapped its internal voltage thresholds to the new cell's discharge curve. The original firmware calibration was set against the aged original cell, so a fresh replacement can read as 40% one moment and drop to 15% the next. Run two full charge-discharge cycles through the camera body without interrupting either cycle. After the second full cycle, the indicator typically stabilises — if it does not, check that the charge completes to 4.20V before disconnecting the charger.