Battery Management Systems either just display the series battery voltages, or actively balance the batteries. In a series string of batteries, the worst performing battery, sets the pace of the entire battery string. Here are systems, available for $, for balancing a pack. Gordon Stalling's battery monitor, or Lee Hart's. Or the PowerCheq unit. Checkout the mad katz.

Solectrias-E-10's and Forces. A yahoo group devoted to owners of Solectria's products .