We have used several different types of battery management systems and we are now distributors for the MiniBMS. Theres are several different board connector sizes available; please contact us if you'd like to place an order. It's a simple and economical solution for prismatic lithium cells. 

See Manual Here

We've also been impressed with the Orion BMS and have become distributors for them.  You can find details here:http://www.orionbms.com/.