I opted for this charger, as the price of just over 20 for a charger with the described properties was simply unbeatable. Although I had not found anything about this device on the Internet, but I have it ordered me. It is suitable for a variety of battery types. The battery You simply clamped to the battery charger detects the battery (if 6 or 12V9 and loads on it. If it is full, a red LED lights up. The description also states that the device can be for months on the battery and it is after the battery is full, switches to obtain cargo. Furthermore, there is also a reverse polarity protection, if one should mix up times plus and minus. For the colder days there are also extra a winter button.
From me, there are clear 5 * with a buy recommendation.
