We found this circuit on the internet, but it has some problems. It will be convenient to limit the current of the transformer by the battery so as not to cause it to overcharge and heat up, with eventual burning. Thus, we suggest that a 10 ohms x 25 W wire resistor or a car headlight bulb be connected in series with the current indicator. The transformer has a secondary of 12 + 12 V with a current of 5 A. The primary is according to the local network.
