Tera Four Parallel Socket Multi Rapid Battery Charger with 4PCs 3.7v 600mAh Li-po Battery for Upgrade Parrot Mini Drone Jumping Sumo or Rolling Spider Li-po battery charger with circuit protective IC in each charge socket Over charge protection, avoid high current damage your battery It can charge1,2,3 or 4 batteries at a time, which saves your charging time a lot Li-po Battery with circuit protective IC, over charge and discharge protection Light weight and compact design Charging method:connect charger with original USB charging cable of Rolling Spider or Jumping Sumo, and equipped with power adapter of cellphone or pad (2A) Li-po battery with capacity of 600mAh 3.7V.Discharge Current: 15C continuous discharge, with circuit protective IC Charger is suitable for our 3.7v, 600mAh, 15C mini batteries include original battery. Battery is compatible with Parrot Mini Drone Rolling Spider and Upgrade Parrot Mini Drone Jumping Sumo