Highly respected 3rd Party batteries like Watson and Patona, quote capacities that are very similar to the OEM battery’s capacity. My own experience, and that of many others, is that the best 3rd Party batteries can deliver a capacity similar to the OEM batteries 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 I don't think you will see any difference in the X-Pro2 because it was not designed to be take advantage of the features of the NP-W126s. For all versions of Fuji X ILCs except for the X-T2, the NP-W126 or the NP-W126s is the correct battery to use. For the X-T2, the NP-W126 will work if you don't use 4K video. Japan, China : 2,412 MHz–2,472 MHz (13 channels) * Other countries : 2,412 MHz–2,462 MHz (11 channels) Well, that's a piece of information I've not seen. Where did you read that about the X-Pro2 design? B&H lists compatibility for the battery as: X-T2 and X-Pro2. Why do they identify these two as fully compatible but not the X-T1 and earlier x models? You must have sources that say B&H got it wrong. I'm genuinely curious.

It makes more sense to me that Fuji would have designed both of the Generation 3 cameras to take full advantage of the new battery they were developing, but that the battery might not have been ready for the X-Pro2 release. But what happens to my current OEM and Watson NP-W126 batteries if I upgrade to an X-Pro2 or X-T2? will they die a slow death from the extra heat generated in the new camera or just discharge a lot faster? This battery is made of top materials of Lithiumion cells that have been safely certified by RoHS, CE, FCC and tested through repeated simulated work and commissioning before they are shipped from the factory. On the other hand, its specifications are based on the original standards such as appearance, interface type, body size, capacity, voltage, charging current and voltage, etc. Is it real Fujifilm NP-W126S compatibility information?Movies: Standard output sensitivity equivalent to ISO 160 – 12800 in increments of 1/3 EV; AUTO; extended output sensitivity equivalent to ISO 25600 Autofocus system: Intelligent hybrid AF (TTL contrast-detect/phase-detection AF) with AF-assist illuminator 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). Tested Batteries Chart Explained The Perfect Battery Fujifilm NP-W126S Battery Best Third Party Battery Worst Third Party Battery Apparently the cheapest aftermarket batteries fail pretty bad, but fortunately many brands offer pretty solid competitors to the original batteries. They often have almost the same capacities and also heat management under a heavy load seems to be alright.

The frame rate and number of frames per burst varies with shooting conditions and type of memory card used. I haven’t done any rigorous testing in this area, so far I’ve just tried to put all the brands to a fridge for few days, but haven’t measured any significant loss of charge. Even when not used for a long period, none of my batteries suffered any significant discharge. Battery aging 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 My old original NP-W126 currently, after several years of usage, has roughly 1100 mAh, while it had >1200 mAh when new. Lower quality batteries can show more significant aging, the DSTE battery is already almost unusable. ConclusionHS50EXR HS30EXR HS33EXR Will this battery have any safety risks? What is the quality of the Fujifilm NP-W126S compatible battery?

The battery indicators in cameras are based on actual voltage of the battery. However, since the Fuji batteries have quite a different voltage curve, compared to all the aftermarket batteries, the remaining capacity shown by the camera isn’t accurate for non-Fuji batteries. This is mostly apparent on almost empty batteries — while the camera shows that the battery is still OK, it can actually be almost empty. Note: Battery endurance varies with battery charge level and the figures given above are not guaranteed. Battery endurance will decline at low temperatures. We have already reported about Dom Varney’s articles “ Powering the Fujifilm X-T3” and “ Fujifilm NP-W126S Battery Counterfeits – A Visual Guide to Spotting the Fakes“.This issue isn’t that serious on new Fuji cameras (like X-T2 or X-Pro2) since their indicator is more granular and even percentage can be shown. Older cameras (X-T1 or X-Pro1) offer only 4 states of the indicator (Full or 3 bars, 2 bars, 1 bar and Empty). Based on the chart we can deduct how much of the battery remains when there is a change in the battery indicator:

This product information is fully applicable to the Fujifilm series compatible batteries, "Fujifilm battery NP-W126S". Still pictures: Exif 2.3 JPEG (compressed); RAW (original RAF format, uncompressed or compressed using a lossless algorithm; special purpose software required); RAW+JPEG availableThe original Fujifilm’s batteries for X system camera are expensive. That’s the reason why there are so many alternatives available, but it also makes the choice of the right one tough. They not only vary in price and capacity, but some 3rd party batteries can even swell in camera and potentially damage it. This article tries to help with the right choice due to extensive testing of capacities and heat characteristics of several available brands. NP-W126S