$ 55.92 Dell Inspiron 1525 Laptop Battery 4400mAh 11.1V
DELL BatteriesDell XPS M1210Dell XPS M1330Dell XPS M1530 Dell XPS M2010Dell Studio 1745Dell Studio 1747
$ 58.99 HP Pavilion DV6000 Laptop Battery 8800mAh Hi-capacity
HP BatteriesHP Mini 1000HP Mini 110HP Pavilion DM3HP Pavilion DM4HP PAVILION ZV6000HP PAVILION ZV6004
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5200mAh 11.10V li-ion Sony VGP-BPS8 Battery
$ 65.25
List: $ 106.50

4400mAh 14.8V li-ion Compaq Presario R3000 Battery
$ 66.12
List: $ 86.12

4800mAh 6 cell Dell XPS M1530 Battery
$ 64.99
List: $ 89.32

4400mAh 14.8V li-ion HP Pavilion DV9000 Battery
$ 75.15
List: $ 94.35

5200mAh 11.1V li-ion Sony VAIO VGN-FZ Battery
$ 65.25
List: $ 109.89

5200mAh 11.1V li-ion Sony VGP-BPS9 Battery
$ 58.69
List: $ 142.99

4400mAh 10.8V li-ion Toshiba Pa3465u-1brs Battery
$ 61.99
List: $ 96.58

4400mAh 10.8V li-ion Toshiba pa3634u-1bas Battery
$ 65.36
List: $ 96.58

For many people with laptop computers the trick is trying to make their batteries last longer so that they don't have to rely on recharging the laptop battery so often. There are little things you can do here and there to not only extend the charge on your battery for your laptop but also make sure that you are up and computing in a remote location for a longer period of time. It isn't exactly putting money in your pocket but if time is really money then there is a lot to be said for more time out of your laptop battery.
Acer aspire 3000 battery (Compatible Acer BT.T5003.001, ACER LCBTP03003)
US$ 58.88
Compaq Presario r3000 battery (Compatible COMPAQ 346970-001, COMPAQ PP2100)
US$ 66.12
Dell Inspiron 6400 battery (Compatible Dell D6400, Dell GD761, Dell KD476)
US$ 54.58
Sony VGP-BPS8 battery (Compatible Sony VGP-BPS8, Sony VGP-BPS8A, Sony VGP-BPS8B)
US$ 65.25
Sony VGP-BPS9 battery (Compatible Sony vgp-bps9, Sony vgp-bps9A/B, Sony vgp-bps9A, Sony vgp-bps9/B, Sony vgp-bps9/S)
US$ 58.69