Laptop batteries come in all shapes and sizes also differ in their chemical composition. The chemistry of a battery refers to the chemical make-up of the cells inside the outer casing. The most common chemistries used in laptop batteries are:
NiCad (Nickel Cadmium) This is the oldest technology and is the least commonly used nowadays. NiCad batteries are prone to the "Memory effect" and are heavier than the newer technologies. NiCad is not environmentally friendly chemistry as it contains heavy metals, which cannot be disposed of in landfill sites. Most manufacturers have stopped producing batteries of this type chemistry. As an end user it will be increasingly difficult to source these batteries. The best alternative is external battery packs.
NiMH (Nickel Metal Hydride) these batteries are less likely to be prone to the memory effect and have a much better power to weight ratio than NiCad. This is a commonly used chemistry. These batteries are also being phased out by most manufacturers. However, many have lithium-ion versions that are compatible. Always consult the manufacturer or a reputable laptop battery supplier.
Li-Ion (Lithium Ion) - This is becoming the dominant technology due to its excellent power to weight ratio. Such considerations are becoming more important as mobile devices become smaller and lighter and battery weight becomes significant. Another plus point for Li-Ion is that it doesn't suffer the memory effect at all. These batteries do have a tendency to lose charge quickly towards the end of their effective life span. If this starts to happen the battery must be replaced.
These three technologies are quite different in the way they charge and therefore should not be substituted unless the device has been designed to take different chemistries. The owner's manual will describe which batteries are suitable.
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2009年2月2日星期一
2009年2月1日星期日
Care for Laptop Batteries
Care for Laptop Batteries
Lithium Ion notebook batteries wear down because of two factors:
1. active usage in your notebook battery
2. natural aging of the notebook battery
Both will wear down your laptop battery over time; the trick is to minimize their impact while still getting the performance out of your laptop battery that you need.
The most important thing to understand about laptop batteries is that they are always losing a small bit of their charge. The hotter the temperature, the faster notebook batteries loose their charge. So rule number one is: keep your notebook battery cool. Notebook battery manufacturers store their products at around 60F.
The second most important thing to understand about notebook batteries is that their capacity decreases with each cycle of charging and discharging. By itself, this is not surprising - but when combined with the previous point, it leads to a surprising conclusion.
When laptop users leave their laptop battery inside the machine but leave the computer plugged into the wall, the laptop battery is going through a constant charge-discharge cycle. The notebook battery is sitting unused inside the notebook, discharging a little faster than normal because of the notebook’s heat. Once its charge level drops to a predetermined level, the AC adapter provides extra juice to “top off” the notebook battery. As the laptop battery gets older, it tends to self-discharge a little faster, which accelerates the process even further…
Lithium ion notebook batteries normally offer 600 to 800 charge/discharge cycles over 1.5 to 3 years of useful life. When you use your notebook battery as described above, you are needlessly using your supply of recharges.
One additional note: many people recall that older notebook batteries on early computers worked best when they were fully discharged before being recharged. While that remains true for Nickel Cadmium technology, today’s Lithium Ion notebook batteries work best when they are recharged when they still have 10 to 20% capacity remaining. So if you are using your notebook battery on a long flight, try not to get in the habit of using the notebook battery until it has almost no charge. Your laptop battery literally won’t be the same when you re-charge it the next time.
Some Guidelines for notebook batteries:
1. Remember that new batteries generally arrive in a discharged state; you must charge them up for at least four hours before their first use.
2. Keep your laptop battery cool, but do not put it in the refrigerator or freezer
3. Don’t use the notebook battery if you don’t have to! Many people keep their laptop plugged in most of the time. They can preserve their battery life by storing the battery outside the laptop in a cool place.
4. Try to avoid running your laptop battery all the way to zero
5. Don’t charge your computer battery before long periods of inactivity
6. Much as we’d like to sell you more laptop batteries, don’t buy spare notebook batteries for later use. The longer you hold them, the less useful life they provide
Lithium Ion notebook batteries wear down because of two factors:
1. active usage in your notebook battery
2. natural aging of the notebook battery
Both will wear down your laptop battery over time; the trick is to minimize their impact while still getting the performance out of your laptop battery that you need.
The most important thing to understand about laptop batteries is that they are always losing a small bit of their charge. The hotter the temperature, the faster notebook batteries loose their charge. So rule number one is: keep your notebook battery cool. Notebook battery manufacturers store their products at around 60F.
The second most important thing to understand about notebook batteries is that their capacity decreases with each cycle of charging and discharging. By itself, this is not surprising - but when combined with the previous point, it leads to a surprising conclusion.
When laptop users leave their laptop battery inside the machine but leave the computer plugged into the wall, the laptop battery is going through a constant charge-discharge cycle. The notebook battery is sitting unused inside the notebook, discharging a little faster than normal because of the notebook’s heat. Once its charge level drops to a predetermined level, the AC adapter provides extra juice to “top off” the notebook battery. As the laptop battery gets older, it tends to self-discharge a little faster, which accelerates the process even further…
Lithium ion notebook batteries normally offer 600 to 800 charge/discharge cycles over 1.5 to 3 years of useful life. When you use your notebook battery as described above, you are needlessly using your supply of recharges.
One additional note: many people recall that older notebook batteries on early computers worked best when they were fully discharged before being recharged. While that remains true for Nickel Cadmium technology, today’s Lithium Ion notebook batteries work best when they are recharged when they still have 10 to 20% capacity remaining. So if you are using your notebook battery on a long flight, try not to get in the habit of using the notebook battery until it has almost no charge. Your laptop battery literally won’t be the same when you re-charge it the next time.
Some Guidelines for notebook batteries:
1. Remember that new batteries generally arrive in a discharged state; you must charge them up for at least four hours before their first use.
2. Keep your laptop battery cool, but do not put it in the refrigerator or freezer
3. Don’t use the notebook battery if you don’t have to! Many people keep their laptop plugged in most of the time. They can preserve their battery life by storing the battery outside the laptop in a cool place.
4. Try to avoid running your laptop battery all the way to zero
5. Don’t charge your computer battery before long periods of inactivity
6. Much as we’d like to sell you more laptop batteries, don’t buy spare notebook batteries for later use. The longer you hold them, the less useful life they provide
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