Batteries can be used immediately out of the package Batteries can be used in any C device and work in all C NiMH chargers; ideal for high drain devices About EBL EBL is a certified brand manufacture that produce EBL series general use battery such as AA/AAA/9V/C/D rechargeable battery,many kinds of battery charger for different types battery. About product: The EBL C cell rechargeable batteries are greatly designed for enhanced performance for high drain applications such as:R/C controller detector, emergency location transmitters and beacons, paintball guns, GPS, LED lighting devices and other portable high drain digital electronics delivering dependable power allowing you to maximize your music, gaming, computer, photography and other experiences . They come pre-charged and can be used immediately out of the package.