400mAh battery on the recently launched Ace 5. For context, the Ace 3V, which the Ace 5V will replace, featured a 5,500mAh battery and supported 100W fast charging. It was powered by the ...

plug the male end into your usb battery. connect the positive and negative ends of your multimeter to the red and black usb wires respectively. if it reads something very close to 5v then you ...