Enhancing the life of Lithium-ion (Li-ion) battery packs has also been the topic of much interest in the e-transportation industry. In this framework, the role of on-board cell voltage balancing (with temperature rise considerations) of Li-ion batteries will be highlighted. This is a very important design aspect, which directly affects cost, calendar life, state-of-charge, and state-of-health. The design and implementation of a novel, reduced-parts DC/DC converter for battery cell-voltage-equalization will be discussed. For the first time ever, this talk will also introduce a closed-loop cell charge balancing technique that uses instantaneous cell voltage and/or temperature rise (ΔT) as a control parameter.