Maximum Battery Capacity for different Macs

Macbook 2.1
2007, 2GHz, 1GB
Second battery (first replaced under warranty after handful of cycles)
Current cycles 1231
Current capacity 95% (4775)

But I do need to upgrade...

I purchased a new laptop battery for my 13inch Aluminum unibody MacBook.

It's been about 3 weeks so far since I installed.