Yep, the link above is the best info.
Only danger is how addicted you get to battery freedom!
I now run my live rig on two of these batteries, and have another for OTing while travelling or on the balcony.
Don't think I've used the elektron power supply in 6 months.
The tekkeon ones aren't cheap but seem good quality. I got mine here:http://www.bhphotovide..._ALL_Plus_MP3450i.html