A portable device and method of supplying power to the portable device may provide a sterile environment that may protect the health and safety of patients on whom the device is employed. The portable device may be charged inside of the sterile environment. The portable device may be charged using at least one chargeable battery that may be arranged internal and/or external to a portion of the portable device, or internal and/or external to the portable device. A power supply may be connected to the at least one chargeable battery and power the portable device for use. The portable device may be charged up to 100% and/or or fully charged prior to opening the sterile environment.