The battery slot is not connected to the USB out. In other words, the battery cannot be used to charge the smartphone. The USB out works only from the 220V/12V input. This charger is only a 220/12V to USB and a 220/12V to battery; 2 functions that cost less than 4USD bought separatedly. The product description should have clearly described the limitation and I would never have bought it.
The battery slot is not connected to the USB out. In other words, the battery cannot be used to charge the smartphone. The USB out works only from the 220V/12V input. This charger is only a 220/12V to USB and a 220/12V to battery; 2 functions that cost less than 4USD bought separatedly. The product description should have clearly described the limitation and I would never have bought it.