Unexpected shutdown on battery power

I have a MacBook Pro 2007 "Santa Rosa" 15" 2.4 GHz (MA896LL A). In the three years I've owned it, I've gone through three batteries. Apple replaced the first one through their replacement program. My MacConnection warranty supposedly doesn't cover batteries, so when the second Apple battery failed, I bought a few third-party models, and one by one, these have failed. While I'm waiting for my NuPower replacement, I'm noticing that with a seemingly good battery at nearly 100% capacity, the computer shuts off with no warning after ten minutes. And it wont restart, even thought the indicator on the battery reads four green lights. With the MagSafe, everything is fine.
I really think there's more to this than battery issues. Why is there no warning before the shutoff? Why does this MacBook Pro destroy batteries? Since upgrading to Snow Leopard, the problem is much worse in that the shutdown happens much sooner. When I was back on 10.5.8, the same battery would last about an hour and then shut down (with no warning). Is there anything that can be down other than replacing the battery every half year? At least the NuPower was warrantied.
Model Name: MacBook Pro
Model Identifier: MacBookPro3,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Battery Information:
Model Information:
Serial Number:
Manufacturer: GSA-A1175
Device name: ASMB012
Pack Lot Code: 012d
PCB Lot Code: 050d
Firmware Version: 646e
Hardware Revision: 2800
Cell Revision: 0000
Charge Information:
Charge remaining (mAh): 5063
Fully charged: Yes
Charging: No
Full charge capacity (mAh): 5076
Health Information:
Cycle count: 62
Condition: Normal
Battery Installed: Yes
Amperage (mA): -962
Voltage (mV): 12411

My niece had an original MBP, and went through I think 5 batteries in 3 years. I have the 17" Santa Rosa MBP, and I just now got my first replacement battery.
My guess is that there is some other problem that is causing the multiple battery failures, although I have no idea what it could be. It almost sounds like the connection of the battery to the logic board could be faulty, since you lose power suddenly even with a fully charged battery in "Normal" condition. If you are still under warranty, it might be worth trying for a diagnosis before the warranty runs out. Since resetting the SMC doesn't seem to help much, I wonder if the SMC chip itself is faulty?
Don't know what type of 3rd party batteries you have tried, but Apple and NuBattery seem to be generally reliable. I've been very pleased with the NuBattery I bought for my iBook. If you continue to experience battery failures, I would hazard a guess that it is not a string of faulty batteries, but rather some issue with your Mac.
Good luck!

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