Pleasantly surprised. After opening, it turned out that nothing needed to be added. The cooling fan 60x60x10 is already pre-installed. They wrote that it costs 40x40x10 and there is little sense from it. I thought about changing too. The transistors on the heatsinks already have thermal paste. I also thought about redoing it. The charging current at the end of charging drops to 0.1-0.2 A. Without fear, I leave the battery on charge for 2 days. At least auto battery. 12V 80A. Though gel on 6V 4A What is on the children's ATV. Or Moto Akum. 12V \ 9A. Charged the Car without removing the Battery in the yard. Everything is fine. I used it as a power supply for a 2-din Android Car Radio at the stand. The display immediately shows how much current this car radio receives during operation and in sleep mode. The numbers on the scoreboard do not jump. Acquisition date 12202222