I would go with the 35mm f/2. I have both the 27mm and 35mm. I am happy with them both. Size and weight go to the 27mm, but weather resistance goes to the 35mm. F/2 and a little higher ISO will work just fine.
I think this may be what you want. I have two of the chargers and 4 of the batteries. I am satisfied with their performance.
https://www.amazon.com/Wasabi-Power-Battery-Charger-Fujifilm/dp/B0084G3FKE