The Phantom 4 Battery Charging Hub is...
Part No. 8
The Phantom 4 Battery Charging Hub is designed for use with the Phantom 4 Intelligent Flight Battery. When used with the Phantom 4 Battery Charger, it can charge up to three Intelligent Flight Batteries. The Intelligent Flight Batteries will be charged in sequence according to their power levels, from high to low.
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Storage Mode allows the Charging Hub to keep the Phantom 4 Intelligent Flight Battery at a 50% charge, which is ideal for storage.