Test and charge car batteries easily and safely with TOPDON. The optimized 9-step charging process desulfates and maintains the battery to extend its lifespan. As a tester, it can display and save pre- and post-test reports as photos. Allows control via a smartphone app: adjust current and voltage, monitor real-time energy consumption and charged power. The time-based charging option automatically activates at the specified time, while intelligent safety functions provide protection against reverse polarity, sparks, short circuits, overheating, and overvoltage. The durable ABS plastic housing is resistant to high and low temperatures, featuring water and dust protection for operation in harsh conditions. Compatible with all 6V and 12V lead-acid batteries and deep-cycle batteries.