With proper care, the expensive lithium-ion batteries in your notebook PCs and other portable gear can run well for many, many years.

Common battery-care mistakes will reduce your batteries’ run times and lead to needless environmental waste and costly early replacement.

Heat is the biggest offender to lithium-ion (Li-Ion) batteries. It is best to keep the laptop as a whole as cool as possible by avoiding direct sunlight, leaving the laptop on while storing it in a bag, or leaving the battery in while it is plugged in and already at full charge. When your laptop is running on AC power, it’s recommended to remove the battery pack and store it in a cool place, like the refrigerator (in tightly wrapped plastic bag). Low temperatures stall the inevitable and irreversible chemical changes that occur in Li-ion batteries.

In fact, if your laptop is mostly run off household AC power, you can greatly extend the life of its Li-ion battery by following the 40/40 rule: Run the battery down to about 40% of maximum charge then store it at 40 degrees Fahrenheit (in your fridge).
If you can, avoid running Li-ion batteries all the way down. It used to be recommended to run the battery all the way down, but that has changed with the Li-ion batteries.  It is best for the battery to be used between 40-100% of the charge.
Even when you are careful about the battery, your battery will still eventually go bad from normal wear and tear.

Most people purchase spare batteries, but it is best to wait until you really need one for heavy mobile usage or you will have the same problem with it wearing out before it is needed.  If you do have a spare battery, store it in the fridge with about a 40% charge when it’s not in use.

It is important to check the manufactured date on the battery pack when buying a replacement.  It could have been on the shelf for a couple years, which defeats the purpose of buying it.
If carefully taken care of, you can get 300-500 charges from a battery and a happy battery life.
These two excellent articles provide more information on Li-Ion battery life:

• How to prolong lithium-based batteries from BatteryUniversity.com

• The care and feeding of Li-ion batteries from TechRepublic.com

Have a dead laptop battery or two? Give it to me and I will recycle it properly for you! I can also provide replacement batteries for your laptop.