Battery damage from 45W vs 65Wattage chord?

I just realized that the possible reason my PBook 15" 1.67HRz battery was only lasting 1 hour and 'not really fully charging' was that the two powerchords I was given (sold) with this computer were only 45Watts. They did not have the large "45W" printed on the white brick, so it was hard to know. urgh....
I went out and bought a new 65W power chord from the Apple store tonight (M8943LL/A) and am currently charging the battery (after letting it run down to 1% when the computer shut off). Man, the brick gets real hot!!
I assume the previous user (a family member) was using 45W cables too. They said the orginal powerchord broke, and they were told these were fine (didn't understand the wattage difference).
The Battery Power readings in my System Profiler (10.4.4) report:
Full Charge Capacity (mAh): 3959
Remaining Capacity (mAh): 3443
Do these numbers reveal anything?
How long can I expect the battery to last?
Is it true that you can use a 65W on an ibook,Tbook, others that only require the 45W, but not the other way around?
Thanks

the 'genius' at the bridgeport apple store (tigard,or) tells me that using the 45w won't damage it, it just won't let u do the firmware update on that battery. the documentation also says it won't get 'optimal performance' with any but the 65w -- guessing that means the processor can't run at 1.67 without it. maybe it goes down to 1.5? who knows? just a guess. just recalibrate yr batt., shld be fine.
~j

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