12V battery charging is better to buy an electronic charger or a transformer charger?

From a practical point of view, it is still electronic, because it has a variety of protection functions, such as current limiting, voltage limiting, pulse charging, timing charging, uniform charging, floating charging and other functions, and will not overcharge the battery, so it has a good protection effect on the battery. The current charger is a little more advanced and has the function of battery repair, which is very beneficial, especially for older batteries. From an economic point of view, you can make a charger if you have strong hands-on ability. As liulanfang 1978 said, you should use a half-wave rectifier to charge the transformer, but you should choose the appropriate transformer and rectifier diode according to the size of the battery, because the charging current can only be controlled by the size of the rectifier tube. If the rectifier tube is too large, the charging current will be larger, otherwise the charging current will be smaller, and the charging time will be adjusted according to the charging current.