If the battery cannot be charged, check the following aspects:
1. Check whether the battery is installed. If you are sure that the battery is installed, you can proceed to the next step.
2. Check that the universal charger has added points. If there is a multimeter, you can measure whether there is an output voltage, you can check whether the indicator light of the universal charge is bright. If the indicator light is on, and there is no voltage output at the output end, it means that your universal charger has \"struck\". Now the quality of the universal charger on the market is very poor, it is possible that your universal charger is only worth about 3 yuan.
3. The next step is to check if your battery is good. You can take someone else's battery and see if it can be charged. If it can charge, then your charger is good. Then there's probably something wrong with your battery.