About this replacement
Sony A7 Mark 3 / A7R Mark 3 / Alpha 1 — 7.4V Li-ion Replacement Battery (NP-FZ100)
This is a 7.4V, 2050mAh Li-ion replacement for the Sony NP-FZ100 battery. It fits the Alpha 7 Mark 3, Alpha 7R Mark 3, Alpha 1, Alpha 7C, and over 50 additional Sony Alpha bodies. Capacity is drawn from verified product data — 15.17Wh.
- Alpha series compatibility: Sony's NP-FZ100 platform covers a wide range of full-frame and APS-C mirrorless bodies that share the same 7.4V rail, Z-series connector, and BMS handshake protocol. One cell works across the entire lineup because the BMS authentication layer is standardised across these bodies.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an Alpha 7 Mark 3 body. The BMS accepted the cell after one full charge via the camera's USB-C port, and the remaining-capacity indicator stabilised within the first two cycles.
- First-cycle initialisation on Alpha bodies: On first install, run a complete charge cycle through the camera body itself — not a standalone charger. Some Alpha BMS builds require an in-body charge to map the cell's discharge curve accurately before the shot-count estimator reads correctly.
Why the Alpha 7 Mark 3 drains faster during continuous video than stills shooting
During video recording, the Alpha 7 Mark 3 runs the sensor, BIONZ processor, image stabilisation, and EVF simultaneously — a combined draw that far exceeds stills use. This sustained load pulls the cell closer to its lower voltage threshold faster than burst stills cycles do. The BMS will trigger a cutoff before the cell reads 0% to protect the cell, which can look like early depletion. If the camera shuts down mid-clip, check that the body firmware is current — older firmware versions set a more conservative cutoff floor.
Battery percentage jumping erratically on the Alpha 7 display
This happens when the camera's BMS hasn't yet mapped the new cell's discharge curve. The Alpha 7's indicator uses voltage-threshold tables calibrated against the OEM cell; a fresh third-party cell may have a slightly different mid-range discharge slope. Run two full charge-to-discharge cycles in the camera body to let the BMS recalibrate. After two cycles, the percentage readout should track linearly — if it still jumps at around 3.6V per cell, confirm the battery terminals are clean and seating fully in the grip.