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Still pictures: Exif 2.3 JPEG (compressed); RAW (original RAF format, uncompressed or compressed using a lossless algorithm; special purpose software required); RAW+JPEG available In Europe, there are very good Patona Platinum, Patona Premium and ExPro White. All of them offer >90% capacity of the original batteries and also they don’t seem to produce significantly more heat even after some heavy use. I also used my thermal camera, Flir One for Android ( iOS version exists too), to capture batteries after a heavy load. While the original battery shows mostly evenly distributed heat on its surface, the noname battery has much higher temperature in a smaller rectangle in the middle. This might be the reason for swelling of some batteries. Self-discharging The Fujifilm NP-W126S is a high performance lithium-ion rechargeable battery which provides users with long term use and repeated charges. The Fujifilm NP-W126S is recommended for X-T2 in conjunction with the Vertical Power Booster Grip to allow 30min of 4K movie recording.
fujirumors.com– JJC is offering a practical (and cheap) dual USB battery charger for Fujifilm NP-W126/S batteries The Duracell multi-fit camera battery provides long-lasting lithium-ion power for a range of camera makes and models, allowing hundreds of photos to be taken on a single charge. Watson and Green Extreme have performance pretty much on par with the original batteries and cost roughly a third of them. They are currently available only the US.
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If you want the ultimate performance or you do a lot of 4K video recording or continuous shooting, NP-W126S is clearly the winner. That said, some of the third party batteries are very close to the Fujifilm’s original in performance, while they cost only a fraction of the price. Japan, China : 2,412 MHz–2,472 MHz (13 channels) * Other countries : 2,412 MHz–2,462 MHz (11 channels) Note: Battery endurance varies with battery charge level and the figures given above are not guaranteed. Battery endurance will decline at low temperatures. However, even with a genuinely equivalent capacity to the OEM battery, there may still be differences in power delivery rate, self-discharge rate, and ultimate rate of decline in battery’s SoH (State of Health). When I recently got myself an X100V I was also looking for a fitting charger and in the end went with the Nitecore FX1. The company has many years of experience when it comes to charging these kinds of batteries thanks to their highly regarded flashlights.
I'm not sure that any camera, except the X-T2, has the correct circuitry to take advantage of the NP-W126s. BC-W126S : 65 mm × 91.5 mm × 31.2 mm/2.6 in. × 3.6 in. × 1.2 in., excluding projections BC-W126 : 65 mm × 91.5 mm × 28 mm/2.6 in. × 3.6 in. × 1.1 in., excluding projections The Fujifilm NP-W126S is a high performance lithium-ion rechargeable battery which provides users with long term use and repeated charges. The Fujifilm NP-W126S is recommended for X-T2 in conjunction with the Vertical Power Booster Grip to allow 30min of 4K movie recording. MoreAs used by the Fuji X-T2, X-Pro2, X-T10, X-E2S, X-A2, HS50EXR, HS33EXR and HS30EXR digital camera models.