Not afraid of short circuit, in short circuit mode, the maximum charging current is set! There is a built-in fan for cooling. Bought to charge the battery 12 volts, very satisfied! Its pros: Charges any type of batteries from 7.5 V (for 6 volt acid batteries) to 18 volts (lithium batteries), up to 200 A / h with a current of 20 Amperes! It can be used as a powerful power source, it can be connected in parallel with the same power supply to increase power and current up to 40 A! Some cons: Small output voltage regulation range as a power source 7.4 - 18 volts, I would like a wider voltage regulation range: 0.1 - 24 V for charging a battery with a voltage of 24 V, or better 0-45 V, for a home laboratory .