The Longfei 310 radio modified with lithium battery, the digital display on the screen has faded, the sensitivity of the receiver has decreased, and the sound of the external speaker has become smaller, which means that the battery is insufficient and cannot reach the 3.7 volt rated power

The Longfei 310 radio modified with lithium battery, the digital display on the screen fades, the sensitivity of the receiver decreases, and the sound of the external speaker becomes smaller, which means that the battery is insufficient and cannot reach the rated voltage of 3.7 volts. When charging, the battery symbol in the upper left corner of the screen keeps flashing, which is not a charging indication, because the original unit does not have a charging circuit, and there is no battery monitoring indication. The battery symbol here flashes, just a low battery warning, and after more than 10 minutes of charging, the battery symbol will disappear. How to judge the full charge? It can be based on: 1. The charger indicator light changes from red to green (or blue). 2. The indicator light of the charging pad, the red light is off, and the blue light is on.