Honestly, I would go with the higher power GFX card, but being away from the wall isn't a concern of mine. I would say that the 6210 would be fine to run WC3. I ran WC3 on a Compaq Presario 2110 Notebook 2 years ago on a 64MB GFX card, so this should run it with no problems.
One reason the 6130 tears the battery life in half is the fact that it is a 3GHZ HyperThreaded chip. That requires power alot of power. AMD 2400 runs at 2Ghz, requiring less power.
Most mobile processors are capable at running at lower speeds than the chip can run at. 3Ghz can drop down to say 1.5Ghz and kick up to a higher gear *IF* the running applications require it. So, run both processors at 100% and yes, the AMD will win, the Intel will lose. Watch a DVD on either of those, and I 'd bet you'd have no problems with battery life with either machine.
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