Can I connect my B-TEC/eLITE batteries in series to achieve a higher voltage?

No. The Battery Management Systems (BMS) in the B-TEC and eLITE batteries are not designed to work with higher voltages and cannot be connected in series. Enerdrive offers a series of 24v and 36v B-TEC batteries for higher voltage systems. Pro Series Lithium batteries can also be configured for higher voltage systems.