The Battery Charging Hub for Spark from DJI is designed for use with the Spark Intelligent Flight Battery. It can charge up to three Intelligent Flight Batteries. The Intelligent Flight Batteries will be charged in sequence or simultaneously. The hub optimizes charging based on batteries' power levels and cell voltage. As an added safety measure, when battery temperatures are low, the Charging Hub will limit the charging current to prevent a hazard and prolong battery life.
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DJI Battery Charging Hub for Spark Quadcopter