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Message: <blockquote data-quote="Still Afloat" data-source="post: 513460" data-attributes="member: 32426">Hi LD,It really boils down to the discharge curve.  The lead acid chemistry batteries start losing voltage as soon as a load is placed on them. The longer you use them, the lower the voltage. They typically reach their minimum allowable voltage well before the rated capacity. Also, the higher the load, the faster the discharge. It’s not linear, doubling the load will reduce the running time by more than half.The LiFePO4 has a very flat discharge curve. The voltage remains almost constant until the battery is near full discharge.  So basically you’re getting more useable voltage for a larger portion of the capacity.  However, when the LiFePO4 voltage drops, it does so very quickly. The BMS should shut down the battery at or before full discharge but, common sense should tell you to remove the load when you finally do see that voltage drop.</blockquote>