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- Lithium-ion batteries age. They start degrading as soon
as they leave the factory. They will only last 2-3 years from the date
of manufacture whether you use them or not. You should fully make use of
your Lithium-ion battery, because it will still die off even if you
store it aside and not using it for long time.
- Lithium-ion batteries are good in holding charge. A
lithium-ion battery pack loses only about 5% of its charge per month
when not in use. (Compared to 20% loss per month for NiMH batteries).
- Lithium-ion batteries have no memory effect. You don't have to completely discharge them before recharging.
- If you completely discharge a lithium-ion battery, you can no longer recharge it. It is ruined.
However, the battery has electronic mechanism to prevent it from
complete discharge by stop working when the voltage is too low. A fully
discharged battery left for a long period of time will lose its charging
capacity.
- Lithium-ion batteries can handle hundreds of charge/discharge cycles. Don't worry about recharging it often.
- Lithium ion chemistry prefers partial discharge to deep discharge. Your battery can have longer life if you charge it often rather than charging it after deep discharge.
- Lithium-ion batteries can have as much as 4,700 discharge cycles if you
recharge it at every 10% drop in capacity; 2,500 discharge cycles if you
wait until 25% drop; 1,500 discharge cycles if you wait until 50% drop;
and only 500 discharge cycles for 100% full recharge.
- Avoid leaving them in high temperature, such as in a car parked at sunny outdoor. Heat causes lithium-ion batteries to degrade much faster than they normally would. Keep your battery below 30°C (86°F). Extremely high temperature might also cause battery explosion.
- When stored in 0°C, Lithium-ion batteries suffer about 6% permanent
capacity loss in 1 year. At 25°C, they suffer about 20% permanent
capacity loss in 1 year. At 40°C, they suffer about 35% permanent
capacity loss in 1 year. At 60°C, they suffer about 40% permanent
capacity loss in 3 months.
- Normally, there is built-in mechanism to prevent Lithium-ion batteries from overcharging,
so you don't have to worry about battery degrade due to overcharging.
However, if such mechanism failed, overcharging might cause excessive
heat generated, which is harmful to the battery's lifespan.
- Most lithium-ion batteries cannot exceed 4.20V/cell. While a higher voltage would boost up the battery's capacity, over-voltage shortens its life.
- High charge levels and elevated temperatures hasten permanent battery capacity loss. This
is the reason why some people prefers to remove the battery from
laptop when it is on A/C power (so that the battery will not be always
fully charged, and expose to the heat generated by the laptop).
- Storing the battery at 40%-60% state-of-charge instead of fully charged can prolong its life.
- Avoid ultra-fast charging and discharging. If the charger allows, lower the charge voltage limit to prolong battery life. In
this case, sometimes charging the electronic gadget by connecting it to
a computer's USB port is more preferable than charging it with wall
socket charger.
Source:
http://voyager8.blogspot.com/2011/11/real-fact-about-your-lithium-ion.html
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