The hyperion line of chargers are not cheap, however, they are great chargers and some even have a built in balancer....
http://www.allerc.com/chargers-c-9.h...ab406a515fad98
I have the EOSO615 DUO III and love it. I can charge 2 batts at once at 15Amps each or 1 at 20 amps
1. MBX-6 T8 1900KV, RX8 ON 4S
2. MBX-5T 1520, MMM ON 5S
3. MBX-5 ONROAD CONVERSION 1515, MMM ON 5S
4. MRX-3 ON ROAD CONVERSION 1512, MMM ON 6S
5. TEN T 2650 T8, MMP ON 3S