Lengthen Lithium battery life

Debunking Battery Life Myths for Mobile Phones, Tablets, and Laptops
If you were to discharge your battery to 50%, recharge it, and then discharge it to 50% again, that would count as a single “cycle” with modern Li-ion batteries. You don’t need to worry about performing shallow charges
...
one problem that shallow discharges can cause. Laptops can get a bit confused by shallow discharges and may show you wrong estimates for how long your device’s battery will last. Laptop manufacturers recommend you perform a full discharge about once per month to help calibrate the device’s battery time estimate.
...
Allow your laptop’s battery to occasionally discharge somewhat before charging it back up — that will keep the electrons flowing and keep the battery from losing capacity.

If I remove the battery & run from a power source will it lengthen battery life?
http://mobileoffice.about.com/od/usingyourlaptop/f/laptopbattery1.htm?rd=1

Most battery manufacturers store Li-ion batteries at 15°C (59°F) and at 40 percent charge.
Run the battery down and recharging it at least once every month.

How to prolong lithium-based batteries
http://batteryuniversity.com/parttwo-34.htm

Simple Guidelines

* Avoid frequent full discharges because this puts additional strain on the battery. Several partial discharges with frequent recharges are better for lithium-ion than one deep one. Recharging a partially charged lithium-ion does not cause harm because there is no memory. (In this respect, lithium-ion differs from nickel-based batteries.) Short battery life in a laptop is mainly cause by heat rather than charge / discharge patterns.

* Batteries with fuel gauge (laptops) should be calibrated by applying a deliberate full discharge once every 30 charges. Running the pack down in the equipment does this. If ignored, the fuel gauge will become increasingly less accurate and in some cases cut off the device prematurely.

* Keep the lithium-ion battery cool. Avoid a hot car. For prolonged storage, keep the battery at a 40% charge level.

* Consider removing the battery from a laptop when running on fixed power. (Some laptop manufacturers are concerned about dust and moisture accumulating inside the battery casing.)

* Avoid purchasing spare lithium-ion batteries for later use. Observe manufacturing dates. Do not buy old stock, even if sold at clearance prices.

* If you have a spare lithium-ion battery, use one to the fullest and keep the other cool by placing it in the refrigerator. Do not freeze the battery. For best results, store the battery at 40% state-of-charge.

How to properly treat NEW laptop battery
www.simonjstuart.com/2011/02/06/laptop-battery-calibration-dos-donts

Battery manufacturers or retailers usually tell you “make sure you plug it in and charge for 18 hours before first use”… this is entirely incorrect, and will in fact reduce your battery’s capacity by as much as 35% from day 1.
How to properly CALIBRATE a Lithium-Ion (Laptop) Battery

Here’s how you properly calibrate a new laptop battery to get the absolute longest runtime and life from it:

1. Disconnect your laptop from the mains (AC)
2. Insert your brand new battery into your laptop
3. Switch on your laptop but boot into the BIOS (this is usually done by repeating tapping DEL or F2 during the boot process)! DO NOT BOOT WINDOWS/LINUX/MAC as the ACPI Power Management software will incorrectly condition your battery! (It will detect the battery as being depleted long before it actually is.
4. CRITICAL: Set the BRIGHTNESS of your laptop’s screen to MINIMUM (virtually all laptops allow you to do this via the keyboard)… If you don’t do this, your battery will be calibrated incorrectly.
5. Allow the laptop to run (remaining in the BIOS and disconnected from the mains) until the battery dies. Don’t be alarmed when the laptop turns off suddenly and without warning, this is exactly what we want.
6. Now connect your laptop to the mains (AC) and leave it switched off. You should have an indicator light SOMEWHERE on your laptop to inform you that it is charging, and one would hope that light would change its state to indicate a full battery.

Repeat the above steps about 3 or 4 times