Quick Battery Question

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Baditude

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Apr 8, 2012
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There actually is some evidence that allowing a battery to "rest" after a full charge is benefitual to a battery.

Many chargers continue to give a "trickle charge" to the battery after providing a full charge, which will decrease the overall life expectancy of the battery. This is why it is important to remove a fully charged battery from the charger as soon as the charge cycle is complete. Leaving batteries on a charger overnight while sleeping decreases the life expectancy of batteries.


"Chargers for cellular phones, laptops, tablets and digital cameras bring the Li-ion battery to 4.20V/cell. This allows maximum capacity, because the consumer wants nothing less than optimal runtime. Industry, on the other hand, is more concerned about longevity and may choose lower voltage thresholds. Satellites and electric vehicles are examples where longevity is more important than capacity.

Charging to 4.10V/cell the battery holds about 10 percent less capacity than going all the way to 4.20V. In terms of optimal longevity, a voltage limit of 3.92V/cell works best but the capacity would only be about half compared to a 4.20V/cell charge (3.92V/cell is said to eliminate all voltage-related stresses).

Besides selecting the best-suited voltage thresholds for a given application, Li-ion should not remain at the high-voltage ceiling of 4.20V/cell for an extended time (ie leaving fully charged batteries on a charger and continue to receive a trickle charge). When fully charged, remove the battery and allow the voltage to revert to a more natural level like relaxing after exercise. Although a properly functioning Li-ion charger (ie a "smart or intelligent" charger) will terminate charge when the battery is full, some chargers apply a topping charge (trickle charge) if the battery terminal voltage drops to a given level."


-- Battery University
 
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