This week our battery management system (BMS) arrived.  This small black box and the accompanying cell boards work together to keep our lithium ion batteries working within their operating limits.  While lithium ion batteries are very light and packed with energy, they can be easily damaged if their voltage, temperature, or discharge currant is outside a small range.  The BMS closely monitors our batteries to make sure they perform at their best, and with its arrival we can start to assemble our battery packs!