The Franklin portable thermocycler comes with a power adapter that plugs directly into a wall outlet. The power connector is located on the back of the device and the adjacent LED light will shine blue when successfully charging.
Additionally, the LED lights on the front of Franklin will indicate your battery percentage remaining. When a single red light is visible, your battery has less than 20% remaining and should be charged. Please consult pages 8-9 of the user manual for further information.
Charging takes about 2-3 hours (from 0 to 100% battery), and the device will still work while charging.