What's mean High Self-discharge(2)? What's mean High Self-discharge(2)? Loading less active materials on the plates can reduce the plate swelling on nickel-based batteries. This improves expansion and contraction while charging and discharging. In addition, the load characteristic is enhanced and the cycle life prolonged. The downside is lower capacity. Metallic dendrites penetrating into the separator are another cause of high self-discharge. The dendrites are the result of crystalline formation, also known as memory. Once marred, the damage is permanent. Poorly designed chargers that ‘cook’ the batteries also increase the self-discharge. High cell temperature causes irreversible damage to the separator. While the nickel-based systems can withstand some abuse and tolerate innovative or crude charge methods, the Li-ion demands tight charging and discharging regimes. Keeping the voltage and current within firm boundaries prevents the growth of dendrites. The presence of dendrites in lithium-based batteries has more serious implications than just an increase in self-discharge — dendrites can cause an electrical short, which could lead to venting with flame. The self-discharge of the Li-ion battery is five percent in the first 24 hours after charge and averages 1 to 2 percent per month thereafter. In addition to the natural self-discharge through the chemical cell, the safety circuit draws as much as 3 percent per month. High cycle count and aging has little effect on self-discharge on lithium-based batteries. more info:www.good-battery.com
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