Macbook Pro 3.1 looses power completely when battery at 6..9%

I recently got a new battery for my 2007 Macbook Pro 3.1. Whenever I'm running on battery, the Macbook gives me a warning at 10% remaining battery life and loosed power all of a sudden when reaching 6..9%. All work is lost, when I reconnect the charger cable the Macbook restarts completely and doesn't just wake up from sleep.
Questions:
- How can I calibrate the battery correctly if a complete shut down happens before reaching 0% (as I understand the calibration procedure I need to discharge the battery from 100% to 0% in one go)
- Can a faulty PRAM battery cause this problem?
- Can I check the status of the PRAM battery?
Thanks for any help
John

Shown below is the discharge curve of my A1275 battery (it contains 3 individual cells) vs. time. After 2h6min the hard shutdown occurs each time - at a 'remaining' capacity of ~300mAh.
The battery itself doesn't get calibrated to a lower value, it remains at some 5044-5090mAh when doing a calibration.
The true capacity seems to be only ~4600-4700mAh, but since the calibration procedure doesn't work successfully with this battery, the problem will persist.
Maybe there is a way to lower the battery capacity on purpose to a lower value. There might be a possibility with IO_reg.... (?)
John

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Macbook Pro 3.1 looses power completely when battery at 6..9%

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