Extra battery life from t61p Ultrabay Battery

[j0rd]

I've got a t61p. I'm going to china in January and will be picking up all sorts of goodies for my laptop.

The one i'm really looking forward to getting is an extra battery for the ultrabay.

Can someone tell me how much extra battery life they get from this extra battery? I get about 3.5 - 4 hours with my 9-cell right now.

Item in question:
Link

MOD EDIT: Very long link modified for better scrolling.

[RonS]

I got about an hour off mine when it was new. Now, it probably give me an extra 1/2 hour or so. You may be better off buying a spare 9-cell.

[j0rd]

an extra hour would help me on long flights and such.

Anyone got any other cool ideas for accessories I can get. I got 7 days in hongkong and i'm doing nothing but gadget shopping.