After market battery: Do I have a right to be concerned?

My company develops software and because some of it addresses some of the lower level aspects of the operating system, we periodically need to purchase used units for testing.
We picked up a 1.3GHz, 12" PowerBook on eBay for a few hundred bucks knowing full well it's battery was pretty much dead. Since this unit will likely only be in use a few weeks, or maybe months depending on schedule, we decided to buy a fairly inexpensive "generic" PowerBook battery replacement off of eBay. The advertiser claimed it was "extended life" of 5200 mAh as opposed to the standard, which I believe is 4400 mAh.
When we received the new battery, we wanted to calibrate the system so we charged it up fully then ran it down until the unit went to sleep. The operating conditions to do this were as follows:
- Processor set on its highest speed setting
- Disk is never put to sleep
- The unit is set to never go to sleep
- The display is set to never go to sleep
- The display is set to remain at it's highest intensity
- The screen saver is set to never turn on
...in other words, it's running at full power all the time, and it was also being used to do some work.
I expected this battery to run AT LEAST 3.5 to 4 hours, but in the "full power" mode it lost all it's power and went sleep after only 3 hours. After fully charging the unit up, the System Profiler showed a full charge capacity of only about 3300mAh. The battery seems to work well, and it wasn't expensive ($42.00).
I'm not that familiar with PowerBooks having never owned one. When used realistically on battery power I intend to set the disks will be set to go to sleep when not in use, set the processor at "automatic", have the screen go dark after a few minutes, have the unit go to sleep after probably about 15 minutes, and have the screen dimmed when using battery power. I'm guestimating that in this mode I might get maybe 4-4.5 hours of use, depending on how much work it's doing.
My questions are these:
Am I being too critical of this battery?
Is it normal for a new PowerBook battery to last as I've described?
I have a personal 12" iBook and I tend to get as much as 3.5 hours when operating full power (as described above) and probably nearly 5.5-6.0 hours when the unit's in battery saving mode.
Thanks in advance to all that respond.

Let's not jump the gun yet, guys. This battery is *ONLY* a few days old. For all I know it might drop dead next week. I will say, however, it did come with a one year warranty, so if it does drop dead then we'll see just how well some of these eBay suppliers stand by their products (for some reason, I'm paranoid about eBay, even though all my dealings have been decent on there so far).
With all that said, allow me to ask the question another way. Assuming this battery continues a "normal" life from what it's exhibiting now (by "normal" I mean as I use it, it slowly begins losing it's charge value just like any other decent battery would), how does it's performance and life compare to one that I might have bought from APPLE (original OEM)?
Thanks in advance.

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