The leader in this product category is Electrovaya, formerly known as
Electrofuel. The reviews on these products are favorable, other than
the price and obvious consideration of carrying the extra weight of
the battery on your trips. The highest capacity model offers 12-16
hours of usage. You can order directly from the Electrovaya web site.
Below I will list the statistics for the different manufacturers and
models. I personally would tend to choose Electrovaya, though the
Valence product is also interesting (since it allows you
simultaneously recharge a second device like a cell phone or PDA).
The others I have included for the sake of completeness, though their
web sites inspire less confidence and I would tend to avoid them
(notably the Bix product is the older NIMH battery technology).
Electrovaya lists these Sony models as compatible:
Sony Vaio PCG-F590, PCG-R505GL
From what I have read, most laptops should be compatible. There is a
note that the Sony laptops are not compatible with the PowerPad 80
Model 3, however, it appears you can specify a model when you order.
PRICE WEIGHT WATT HRS VOLT/AMP HR DIMENSIONS
Power Plant $ 99 3+ lbs 60 12V 5.0Ah
PowerPad 80 $279 1.4 lbs 80 15V 5.5Ah
PowerPad 120 $399 1.9 lbs 120 15V 8Ah
PowerPad 160 $499 2.4 lbs 160 15V 11Ah
N-Charge 65 $199 1.8 lbs 65 * 5Ah
N-Charge 130 $299 2.9 lbs 130 * 10Ah
* The Valence allows you to charge two devices simultaneously.
One high voltage at 16-24V, one low voltage at 5-12V.
Bix PowerBase $179 3.5 lbs 90 12V 7.5Ah 11.8" x8.9"
Electrovaya (Electrofuel) Reviews:
TechTV Fresh Gear: "Electrofuel PowerPad" by Hahn Choi, September 18,
Eye On Technology: "Electrofuel PowerPad 160"
ZDNet: "Electrofuel Serves up Longer Battery Life" by Bill Machrone,
March 13, 2000
Mercury News: "Rechargeable batteries are not keeping pace with tech
travel needs [N-Charge is a Solution]" by Jon Fortt, June 12, 2002
PC Magazine: "A Long and Happy Life for Notebooks" by Bill Howard,
October 15, 2002 (Article about battery life briefly mentions
Electrovaya and Valence)
MobyPower External Li-Ion battery brick
Search Strategy: Search for Electrovaya and its competitors
Electrovaya Valence laptop
I hope that you have found this information useful and easy to
understand. If you have any questions about this information, please
do not hesitate to post a clarification request prior to rating the