About this replacement
Samsung Galaxy J7 — 3.85V Li-ion Replacement Battery (EB-BJ700BBC)
This is a 3000mAh, 3.85V lithium-ion cell that fits the Samsung Galaxy J7 and its variants, including the SM-J700F/DS, SM-J7008, and Galaxy J7 Duos. It replaces OEM part numbers EB-BJ700BBC, EB-BJ700CBE, and EB-BJ700CBN. Swap it when the original cell no longer holds a useful charge or shuts the phone down unexpectedly.
- J7 variant compatibility: Samsung produced the J7 across multiple SKUs for different regional markets — SM-J700F/DS, SM-J7008, J7 Duos, and 29 additional sub-models. All share the same battery footprint, connector pinout, and 3.85V nominal voltage rail, so one cell fits the full lineup.
- Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on a J7 unit. The BMS accepted the charge IC handshake without fault codes, held voltage above 3.6V through a sustained screen-on and modem load, and tripped the low-voltage cutoff at the correct threshold.
- Fuel gauge recalibration on first use: On first use after installation, disable fast charging and let the phone complete one full discharge-to-charge cycle. The fuel gauge IC calibrates its coulomb counter against the new cell's discharge curve. Skipping this step causes the percentage readout to jump or report inaccurate levels for the first several cycles.
Sudden shutdown at 20–30% on the Galaxy J7 after a cell swap
This happens because the fuel gauge IC is still running the discharge curve it mapped to the old, degraded cell. The new cell has a steeper voltage cliff under modem and display load than the old curve predicted. When current draw spikes — an incoming call, a screen wake, a background sync — the cell voltage briefly drops below the BMS cutoff threshold even though the reported percentage looks safe. One full unconstrained discharge cycle forces the coulomb counter to re-learn the new cell's actual voltage-versus-capacity relationship. After that cycle, shutdowns at 20–30% stop.
Phone warm near the battery compartment during first charge
A new cell comes from storage with elevated internal impedance compared to a broken-in cell. The charge IC pushes current into higher resistance than it was calibrated for, and the extra energy dissipates as heat. This is most pronounced in the first two to three charge cycles and fades as the cell's impedance drops toward its rated value. If the back of the phone feels hot to the touch — not just warm — check that the charging cable is not damaged and limit the first charge to a standard 5W source rather than a fast charger.