2-Pack Callaway uPro Battery with Universal Charger (100/240V) and 3000mAh Portable External Battery Charger - Replacement Callaway uPro Golf GPS Battery and Charger Replacement Callaway uPro Battery and Charger Universal Charger features adjustable slider to charge different lithium-ion batteries (3.6V/3.7V). 100-240V autosensing for world wide use. The external battery pack can charge the Callaway uPro Battery together with the Universal Charger. You can also charge your phone, tablets and other devices that charge via USB. It has a convenient small size that fits nicely in your pocket purse or small bag Callaway uPro Battery Specs - Capacity: 800mAh, Voltage: 3.7V, Upstart Battery Brand, Lifetime Warranty, External Battery Pack Specs - Capacity: 3000mAh, Single USB Output (5V/1A), One Year Warranty On Sale for a Limited Time!