Carry a spare ThinkPad X60 Tablet Li-Ion Battery so you can stay unplugged longer!
4 Cell Li-Ion Battery: 40Y8314 (3 hours average battery life )
8 Cell Li-Ion Battery: 40Y8318 (7 hours of system run time)
http://www.laptoptraveller.com/battery-ibm-thinkpad-x60-tablet-laptop-notebook-accessories.html

Battery life (and recharge time) depends on many factors including screen brightness, applications, features, power management, battery condition and other customer preferences.

The ThinkPad X60 Tablet 4 Cell Battery features:
• Lithium-Ion technology
• 14.4 V, 2.0 Ah
• Three-hour average battery life
• Notched design to accommodate tablet screen swivel hinge for notebook or convertible tablet operation
• Standard system battery specifications
• Over-discharge protection
• Product approvals/certifications: CE MARK, CUL, C-Tick, UL-1950


http://www5.pc.ibm.com/europe/products.nsf/$wwwPartNumLookup/_92P1009

After purchasing a laptop battery, before
using the battery to power the laptop notebook, you must charge the
battery. LaptopTraveller.com gives you some tips about how to check laptop battery power when chariging.

Usually, the laptop’s battery light gives you an indication of
the main battery’s current charge:

• Glows amber while the main battery is being charged
  (AC adaptor connected)
• Glows green when the main battery is fully charged.
• Is unlit when the battery has discharged, the battery is not
  charging, or the AC adaptor is not plugged into the computer or AC outlet.


• Flashes amber when the main battery charge is low and it is time to recharge the main battery or plug in the AC adaptor.

Note: If the AC power light flashes amber during charging, either the
battery pack is malfunctioning, or it is not receiving correct
input from the AC power supply. Disconnect the AC power cord/cable and remove the battery pack.

What to Do When the Main Battery Runs Low

• Plug the laptop into an external power source and
  recharge the main battery
  
• Place the computer into Hibernation mode and replace
  the main battery with a charged spare
  
• Connect the laptop to an optional high capacity
  battery. (LaptopTraveller.com provides selections of high capacity laptop batteries for most models of notebooks/laptops)
  
• Save your work and turn off the computer
  If you do not manage to do any of these things before the
  main battery completely runs out of power, the computer
  automatically enters Hibernation mode and turns itself off.
  Hibernation mode keeps track of where you were, so that
  when you turn on the power again, you can continue where
  you left off.

To avoid losing any data, save your files and then either completely shut down your computer or put it into Hibernation mode before changing the main battery. Do not remove the battery pack while the computer is in Standby Mode. Data is stored in RAM, so if the computer loses power it will be lost. When the computer is powered off in Standby Mode, and the AC adaptor is not connected, the main battery pack supplies power to maintain data and programs in memory. If the battery pack is completely discharged, Standby Mode does not function and the laptop pc loses all data in memory.

Toshiba has announced new Satellite notebooks - Toshiba Satellite L500/505 Laptop ,to be positioned in the manufacturer's L-series. Toshiba's student-targeted budget line of laptops, the Satellite L series, comes in three flavors, all with 16x9 TruBrite LED-backlit displays and a large variety of configurations.

Some Pre-configured models:

The Satellite L500/505 (starting at $549.99) - comes with a 15.1-inch screen
The Satellite L510/515 (starting at $649.99) - has a 13.4-inch screen, but a thinner chassis
The Satellite L550/555 (starting at $649.99) - 16.4-inch screen

6-Cell Li-Ion Battery Pack: Part Number: PA3534U-1BRS
High Capacity 12-Cell Li-Ion Battery Pack: Part Number: PA3727U-1BRS
120-Watt AC Adapter : 19V x 6.3A output: PA3717U-1ACA

The Toshiba Primary High Capacity Battery Pack is a 12-cell, rechargeable, Lithium Ion battery is designed to work with select Toshiba Satellite series portable computers. Used as either a spare or replacement battery, this battery pack meets or exceeds the specifications of the original battery that came with your notebook. It interfaces with the TOSHIBA Power Saver Utility, found on the notebook, which features a charge indicator to help you monitor the available power.

Take your office on the road without sacrificing performance, productivity or convenience with Toshiba Notebook battery packs. Battery power gives you the ability to use your computer around the house, office, on campus and when traveling. Enhanced battery life helps you stay connected and productive wherever your work takes you.

• Snaps in and out of battery slot in seconds
• Genuine Toshiba quality and reliability
• Meets or exceeds original battery
• Additional battery pack provides extended power to work and play without worries

• Capacity: 10.8V x 9000 mAh
• No. of Battery Cell: 12-cell
• Dimension & Weight: 1.97” W X 10.87” L x 1.71” H; 1.37 lb
• Compatible with Toshiba Satellite A500, A505, A505D, L500, L500D, L505, L505D, L550, L555 and L555D; Satellite Pro L550 series portable computers
• RoHS compliant
• Battery Life: 3 hours 53 minutes ~ 7 hours 10 minutes* (Normal Mode)
• Recharge Time (Main Off/On): 4.5 Hours / 10.5 ~ 21.5 Hours
  Battery life may vary considerably depending on product model, configuration, applications, power management settings and features utilized, as well as the natural performance variations produced by the design of individual components. Published battery life numbers are achieved on select models and configurations tested by Toshiba at the time of publication. Recharge time varies depending on usage. Battery may not charge while computer is consuming full power. After a period of time, the battery will lose its ability to perform at maximum capacity and will need to be replaced. This is normal for all batteries.
• In the box: Toshiba Li Ion Battery Pack, EU Declaration and Safety Instruction Manual
• One-year limited warranty

ASUS G51VX a gaming powerhouse which snared the 'Best Choice' award in the Digital Entertainment Products category at the recently-concluded COMPUTEX 2009

The G51vx use the same batteries as the G50 series (A32-M50 p/n)
6-cell 53Wh 11.1v 4800mAh Lithium Ion battery

ASUS A32-M50 battery Replaces part numbers:
A32-M50 15G10N373800 90-NED1B2100Y

Setting a new standard in battery life, the Sony VAIO X Series’ battery life is good rather than great and a heavy use time of almost four hours is bettered by many much cheaper notebooks. The laptop comes with two interchangeable batteries: a standard VGP-BPL19 battery(3.5-hour) and VGP-BPX19, a larger, heavier, battery-and-stand combo that supposedly lasts for up to 14 hours. The large capacity 20-hour VGP-BPX19 battery that clips to the base, but this adds to the size and weight — defeating the whole point of spending so much on so slim a laptop in the first place.

Series: VAIO X Series
Model:
VPCX118LG/B
VPCX115LG/N
VPCX113KG/B

VGP-BPX19 Battery

Battery Type	Lithium-Ion Sony laptop battery (VGP-BPX19)
Battery Life (min)	480
Battery Charging Time (min)	140
Battery Life Disclaimer	Actual battery life will vary depending on your specific hardware and software configurations. Benchmark: MobileMark 2007
AC Adapter	VGP-AC10V5

VGP-AC10V5 AC Adapter

Output: Voltage (V)	10.5
Output Current (A)	2.9
Power Consumption Without Load (W)	0.3 or less
Number of Pins	3
Supplied Accessories	Operating instructions, Power cord

Amazingly thin and light; great battery life with extended battery; faster than other Netbooks.

"Dell's most popular laptop", the Inspiron 1545 (also known as the Inspiron 15), is a sturdily constructed, affordable, mid-range machine that is extremely customisable so can be configured to be suitable for most needs, though higher spec models can get quite expensive.
Get up to 8 hours and 7 minutes of battery life1 with the 6-cell Dell Inspiron 1545 battery!

Manufacturer Part# C601H
Dell Part# 312-0763
Technology: 6-cell lithium ion

48 WHr capacity lets you work seamlessly while on the move
Offers reliable power for dependable performance
Supported by Dell Technical Support when used with a Dell system






http://accessories.us.dell.com/sna/products/Power/productdetail.aspx?c=us&l=en&s=dhs&cs=19&sku=312-0763

The Dell Mini 10v netbook offers great value for anyone looking with a tight budget.

The Dell Mini 10v was the first mainstream Netbook to come out of the starting gate at this sub-$300 price.

Battery for Dell Mini 10v: Six-cells and three-cells are the order of the day for Netbooks. Each has issues: three-cells are cheaper and slimmer but last only a couple of hours, while six-cells are still bulky.

Power Adapter for Dell Mini 10v: OEM part#: AP03003001832F, PA-1300-0419V. Power: 1.58A 30W.

Asus Eee PC S101 - Fabulous Good Looks; Slim & Light

Enjoy All Day Computing with Eee PC S101 with the 7.4V 4900mAh Li-Polymer Battery
Original Part Numbers: AP22-U1001, LPS101B

Asus Built-in Super Hybrid Engine(SHE) provides you with more power per charge: up to 5.4 hours of mobile usage when you are out and about.

Sony BPS13 Battery (VGP-BPS13 , VGP-BPS13A/B, VGP-BPS13B/B, VGP-BSP13/S)
10.8/11.1V 4400mAh Li-ion Laptop Battery

Designed exclusively for use with VAIO® Series notebooks, the BPS13A/B standard capacity battery is perfect for extended computer usage around your home, office or while on the road. A spare battery also lets you use your notebook longer when you aren't close to a power source.

Compatibility
AW Series
BZ Series
NS Series
SR Series

Replacement Laptop Battery for Sony Vaio VGN-AW, VGN-BZ, VGN-CS, VGN-FW, VGN-NS, VGN-SR Series. Compatible Battery Part Numbers: VGP-BPS13, VGP-BPS13/B, VGP-BSP13/S, VGP-BPS13A/B, VGP-BPS13B/B, VGP-BPS13A/S.