Fujifilm NP-W126S Lithium-Ion Battery for X-Pro1, X-E1, X-M1, X-A1

Product Information

Note: Battery endurance varies with battery charge level and the figures given above are not guaranteed. Battery endurance will decline at low temperatures.

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 FX1 charger will report the correct temperature of a thermistor equipped battery, but it does not terminate charging if the battery goes outside the 0°C to 45°C allowable charging temperature range. The user needs to stop the charging process if they notice that the temperature display is approaching the 45°C charge temperature limit." 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:

All the batteries lose their performance with time and usage. Their capacity decreases and the internal resistance increases. Don’t expect the very same performance from few years old batteries as you get from the new ones.

Accessories

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. Conclusion 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 I'd love if they can be charged by USB or provide a USB out so i don't need to carry mobile charger and this