The Triopo G1800 is a lithium-ion powered flash with an Ultra-fast recycle time of only 2.3s. It works on both Canon and Nikon cameras.
Main Features:
• Recycle time of 2.3s
• Supports multiple modes such as TTL/M/Multi/Master/Slave/S1/S2/FEB
• 500-5000 flashes off a single charge
• Spare Li-ion batteries and chargers available (here)