Put together a little resistor based discharge device for Phantom 5200 type batteries: Parts: Qty 4, 100 watt, 8 ohm power resistors Ebay item: 131163389595 Aluminum heat sink Ebay item: 141381483277 Power connector for the Phantom (also good to use same cables to charge multiple batteries on a HiTec 4AC charger) http://www.helipal.com/djip2-06-dji...r-plug.html?osCsid=hdoike8h7011tk5slo9uaf4vu7 Bullet connector pairs, some wiring and screws. Wired up as shown giving 8 Ohms split among the 4 power resistors allowing up to 400 watts power discharge capability which is more than adequate. Discharge rate is about 1.5A. You can switch around the wires to the resistors to change that rate or buy different values of resistors from same item as above. One might want to get a little larger heat sink if you do higher rates.