{"product_id":"fujifilm-medium-format-gfx-replacement-battery-108v-1300mah-li-ion","title":"Fujifilm NP-T125 Replacement Battery 10.8V 1300mAh Li-ion","description":"\u003cdiv class=\"bpw-desc\"\u003e\n  \u003ch2 class=\"bpw-desc-h2\"\u003eFujifilm GFX 50S \/ Medium Format GFX — 10.8V Li-ion Replacement Battery (NP-T125)\u003c\/h2\u003e\n\n  \u003cp class=\"bpw-desc-lead\"\u003eThis is a 10.8V, 1300mAh Li-ion replacement for the Fujifilm NP-T125 battery. It fits the GFX 50S and Medium Format GFX camera bodies. Capacity matches the OEM spec at 14.04Wh.\u003c\/p\u003e\n\n  \u003cul class=\"bpw-desc-bullets\"\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGFX platform compatibility:\u003c\/strong\u003e\n    The GFX 50S and broader GFX line share the same NP-T125 form factor, connector pinout, and BMS handshake protocol. That shared architecture means one cell covers both bodies without modification.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eBench tested on actual hardware:\u003c\/strong\u003e\n    We cycled this cell through the GFX body charger and an OEM-compatible external charger. The BMS accepted the cell on first insertion, reported state-of-charge correctly, and held voltage through sustained burst shooting sequences.\u003c\/li\u003e\n\n    \u003cli\u003e\n\u003cstrong\u003eFirst-cycle BMS calibration on the GFX body:\u003c\/strong\u003e\n    Run the first full charge through the GFX camera body itself, not an external charger. The GFX BMS writes calibration data during an in-body charge cycle, and skipping this step can cause the battery-remaining indicator to read incorrectly from the first shot.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003chr class=\"bpw-desc-divider\"\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eWhy the GFX 50S reports a lower battery percentage than expected mid-shoot\u003c\/h3\u003e\n\n  \u003cp class=\"bpw-desc-p\"\u003eThe GFX body maps remaining charge by tracking voltage against a discharge curve calibrated to the original NP-T125 cell. A new replacement cell has a slightly different discharge curve until it completes a full break-in cycle. During that initial period, the camera may report a steeper percentage drop than the actual state-of-charge warrants. After two to three full charge-discharge cycles, the BMS recalibrates and the display stabilises. If it doesn't settle by cycle three, charge fully in-body to 10.8V and discharge through normal shooting before checking again.\u003c\/p\u003e\n\n  \u003ch3 class=\"bpw-desc-h3\"\u003eGFX body showing dead battery indicator on a replacement cell that still has charge\u003c\/h3\u003e\n  \u003cp class=\"bpw-desc-p\"\u003eThis happens when the BMS has not yet authenticated the new cell's internal resistance signature — common on first insertion. The camera interprets an unfamiliar resistance profile as a depleted or faulty cell and blocks operation. Remove the battery, reinsert it once, then place the body on charge for a full cycle without interrupting it. If the indicator still triggers after a complete in-body charge, check that resting voltage at the cell terminals reads at least 10.8V before reinserting.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"BatteryWeb","offers":[{"title":"Warranty 1 Year","offer_id":43333633146970,"sku":"BWCS-NP125MX-1","price":46.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 2 Year","offer_id":43333633179738,"sku":"BWCS-NP125MX-2","price":53.99,"currency_code":"USD","in_stock":true},{"title":"Warranty 3 Year","offer_id":43333633212506,"sku":"BWCS-NP125MX-3","price":59.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0674\/4775\/0746\/files\/BW-CS-NP125MX-1.webp?v=1778212993","url":"https:\/\/batteryweb.com\/products\/fujifilm-medium-format-gfx-replacement-battery-108v-1300mah-li-ion","provider":"BatteryWeb","version":"1.0","type":"link"}