The DIY Smart Saw
Lithium-Ion batteries have a finite life, they slowly degrade from the day they are first made. The life of the battery will depend upon how you charge and discharge the battery and the temperature at which the battery is kept. A manufacturer will rate a Notebook battery to the point where it holds 50% of its original capacity. At this point you should consider replacing the battery.Li-ion batteries are not as durable as nickel metal hybride or nickel-cadmium designs and can be extremely dangerous if mistreated. They are usually more expensive.Lithium ion batteries can be formed into a wide variety of shapes and sizes, so as to efficiently fill available space in the devices they power, but li-ion batteries are lighter than other equivalent secondary batteries.The energy is stored in these batteries through the movement of lithium ions. Lithium is the third lightest element, giving a substantial saving in weight compared to batteries using much heavier metals. However, the bulk of the electrodes are effectively "housing" for the ions and add weight, and in addition "dead weight" from the electrolyte, current collectors, casing, electronics and conductivity additives reduce the charge per unit mass to little more than that of other rechargeable batteries. The forte of the Li-ion chemistry is the high open circuit voltage in comparison to aqueous batteries (such as lead acid, nickel metal hybride and nickel cadmium).
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