Epson R-D1s - Manual (Page 12)

12 Getting Started
1. Connect the power cord to the battery charger, then plug it into an
electrical outlet. 2. Insert the battery into the battery charger with the terminal end
first. The red indicator light on the charger lights up to indicate the
battery is being charged.
3. When the indicator light turns off, the battery is fully charged.
Remove the battery from the charger.
4. Disconnect the battery charger from the power outlet.