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Fujifilm NP-T125 Medium Format GFX Replacement Battery 10.8V 1000mAh

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From $41.99 USD $52.99
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Fits Fujifilm NP-T125 battery slot on GFX 50S and medium-format GFX bodies.
10.8V, 1000mAh capacity delivers full frame count on a single charge cycle.
Connector slides straight into camera body dock with no locking tab — seats flush.
We bench-tested this cell through five full discharge cycles in the GFX 50S body; BMS accepted the new pack on first insertion without a "incompatible battery" fault.
On first use, run one complete charge cycle inside the GFX body itself — Fujifilm's camera firmware maps battery percentage to this cell's discharge curve during that initial cycle, or display readout will drift mid-shoot.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

10.8V

Amp

1000mAh

Fujifilm GFX 50S / Medium Format GFX — 10.8V Li-ion Replacement Battery (NP-T125)

This is a 10.8V, 1000mAh Li-ion replacement for the Fujifilm NP-T125 battery. It fits the GFX 50S and the broader Medium Format GFX camera system. Voltage and cell chemistry match the OEM specification exactly.

  • GFX system compatibility: The GFX 50S and GFX system share the NP-T125 form factor, connector pinout, and 10.8V rail. The BMS in each body communicates over the same data lines, so one cell works across both platforms without modification.
  • Bench tested on actual hardware: We cycled this cell through the GFX 50S body and an OEM Fujifilm BC-T125 charger. The BMS accepted the cell, voltage hold was consistent across discharge, and the protection circuit triggered correctly at low-cell cutoff.
  • First charge protocol for GFX bodies: Run the first full charge inside the camera body or OEM charger before shooting — not a third-party universal charger. The GFX BMS maps battery-remaining percentages against a charge curve it builds on first contact. Skipping this step causes the indicator to read inaccurately from the first frame.

Why the GFX 50S battery percentage jumps erratically with a new cell

The GFX body tracks remaining charge by mapping voltage against a stored discharge curve. A new third-party cell has a slightly different discharge curve than the OEM cell the body originally calibrated to. Until the body logs a full charge-to-depletion cycle on the new cell, the percentage display interpolates against the wrong reference points. Run one full cycle — charge to 100%, shoot until the body shuts down from low battery — and the indicator stabilises. After that cycle, percentage readings align correctly with actual remaining capacity.

GFX body shows "no battery" or "incompatible battery" on a valid replacement cell

The GFX BMS performs an authentication handshake on insertion. If the cell has been stored below roughly 3.0V per cell from extended shelf time, the battery voltage is too low for the handshake to complete and the body rejects it. Place the cell in the BC-T125 OEM charger first — not the camera body — and let it charge from flat. The charger bypasses the body's authentication gate and can recover a deeply discharged cell. Once the charger brings it to full charge, reinsert into the body and the handshake completes at 10.8V nominal.

Compatible Models

Medium Format GFX GFX 50S

Replaces Part Numbers

NP-T125

Technical Specifications

Voltage10.8V
Amp Hours1000mAh
Capacity1000mAh
Rate10.8Wh
Net Weight75.8g /2.67 oz
Gross Weight145.8g /5.14 oz
Approximate Weight145.8g /5.14 oz
Dimension 54.18 x 36.00 x 26.15mm

Product Highlights

  • Brand: Fujifilm
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My GFX 50S accepted the battery fine but the shot count is way lower than I expected — is the cell faulty?

Shot count varies significantly depending on what the body is doing between frames. The GFX 50S draws heavily from phase-detection AF, the EVF, in-body stabilisation, and any tethered USB output — none of that is factored into published shot count figures, which are measured under controlled, low-draw conditions. A heavily stabilised, EVF-heavy shoot can cut the effective count substantially compared to a live-view-off, OIS-disabled setup. Check your power-saving settings in the camera menu and disable EVF auto-brightness if you need to extend capacity per charge.

The battery percentage dropped fast in cold weather during an outdoor shoot — is this a defective cell?

Cold temperatures directly reduce usable capacity in Li-ion cells — this is chemistry, not a defect. At temperatures below 5°C, internal resistance rises and the cell delivers less current before hitting the BMS low-voltage cutoff, so the body shuts down earlier than indoors. Keep a spare cell in an inside jacket pocket between shots to maintain its temperature. When you bring the camera back to a warm environment, the displayed charge often recovers noticeably as the cell warms back to operating temperature.

The flash on my GFX isn't fully recycling between shots — is that a battery issue or a flash unit problem?

When the cell is near the end of a charge cycle, available current drops and the flash capacitor takes longer to recharge between exposures. This is normal behaviour at low state of charge, not a flash unit fault. If it happens consistently even on a fully charged cell, check that the battery contacts on both the cell and the camera grip are clean — oxidised contacts add resistance that mimics a low-charge condition. Clean the contacts with a dry cloth and test again at a measured 10.8V on a fresh charge.

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