About this replacement
Samsung NX1 — 7.2V Li-ion Replacement Battery (ED-BP1900)
This is a 7.2V, 1900mAh Li-ion replacement for the Samsung ED-BP1900 battery pack. It fits the Samsung NX1 mirrorless camera body, including variants EV-NX1ZZZBMBUS, EV-NX1ZZZBQBUS, and EV-NX1ZZZBZBUS. The cell powers the sensor, autofocus system, EVF, and LCD throughout a shoot.
- NX1 platform fit: All three EV-NX1 variants share the same battery bay geometry, contact pin layout, and BMS handshake protocol — this cell addresses all of them with one part number, ED-BP1900.
- Bench tested on actual hardware: We cycled this cell through the NX1 body and confirmed the BMS accepted charge, reported state-of-charge to the display, and did not trip the protection circuit under normal autofocus and continuous shooting loads.
- First-install charge cycle on the NX1: Run the first full charge inside the camera body or the Samsung OEM charger — the NX1's BMS maps its battery-remaining display to a discharge curve it learns on that first cycle, and skipping it causes erratic percentage readouts during the shoot.
Why the NX1 drains a fresh cell faster during 4K video than stills shooting
The NX1 is one of the few APS-C bodies that records uncropped 4K internally. That mode keeps the full sensor active, runs the HEVC encoder at sustained load, and holds the phase-detect AF system engaged — all simultaneously. Combined current draw in 4K is significantly higher than in single-shot stills mode. A 1900mAh cell at 7.2V gives 13.68Wh total, and 4K video pulls a larger share of that per unit time than burst shooting does. Switching to 1080p or using an external recorder via HDMI offloads the encoder and noticeably extends available capacity per charge.
Battery percentage jumping or resetting to a fixed number mid-shoot
This happens when the NX1's fuel gauge hasn't yet mapped its threshold steps to the new cell's discharge curve. The camera reads voltage, converts it to a percentage using a stored lookup table, and if the cell's curve doesn't match what the BMS expects, the display skips or resets — typically landing on 50% or 25% before dropping again. The fix is one full charge-to-discharge cycle completed inside the camera body, not interrupted. After that cycle, the BMS recalibrates its reference points and percentage readout stabilises. If it persists after two cycles, check that the replacement cell resting voltage is at or above 7.2V before insertion.