I can take some pictures in a bit - essentially I need the larger PCB, mounted on the underside of the drive, but in case it is not this piece, perhaps the other boards and the drive spindle would also be useful. Do you know which model the sled from your PS3 was? If you need help identifying it, post pictures and I'm sure I or someone else can help identify it.
The PHR-803T is the sled from the XBOX 360 HDDVD drive addon, it is capable of running up to about 150mW of violet light, but if you want it to last longer I wouldn't run it this high. Many people start with PHRs because they are readily available and have a good power-cost ratio, and they are relatively well-known compared with the more expensive drives.
EDIT: My new-style Dorcies both run off rechargeable batteries no problem, perhaps you have a different driver? I'll multimeter it, one second...
Confirmed: 3.8V at 0.74A draw from battery, new-style Dorcy. I suspect your batteries are a slightly different size and so aren't making full contact with the driver board, try putting a blob of solder on the driver to raise the +V pad by around 3mm. I had to do this with mine, I think I mentioned this in a thread before?