K&F Concept NP-W126S Battery and Charger 1300mAh NP-W126 for Fujifilm XS10, XT30, XT20, XE4, X100Ⅵ, A5, Dual-Slot Fater Charger, Type-C and Micro-USB Input, 2 Pack Battery
SKU: KF28.0030
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The fast charging is indeed very fast. I can shoot for a day with three batteries in total. I bought two batteries + the ones that come with me, and use them at night and during the day.
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Charging using 5V 2.1A adapter