This extremely powerful Li-ion battery with 3.7 V and 35.52 Wh is fully charged in 330 minutes (5.5 hours). It is perfectly suited as a replacement battery, e.g. for emergencies or long-lasting activities in remote areas.
Compatible with H15R Core, H15R Work, H19R Core, H19R Signature
My sister works for the manufacturer, and she purchased some for me on my birthday in 2020. They are sturdy, flexible and made of some strong stuff. Used to buy Kmart tubs that would only last a few months. I plan on buying more, if I ever need new ones in the future.