2.5kg plus quadra-sized lightweight heads. 500Ws. TTL, HSS, 14W modeling LED. 400 shots on full power. Compatible with Phottix Odin II transmitters as well as Skyport Plus HS after you update the transmitter firmware.
http://www.elinchrom.com/battery/elb500ttl.html
http://www.elinchrom.com/battery/elb500ttl.html