Why can't it see the battery?

I recently replaced the logic board on this computer, with the old one being non-energy star and the replacement board is. I then purchased an energy star battery connector (eBay) and after reassembling it, the computer works except one thing: it doesn't see the battery. The computer boots up and at first acts like the battery is going to charge (displays 0%), but then, it shows an X and in System Profiler, no battery is shown.

I reset the SMC, but that didn't help.

I also tried a charged battery from another MacBook, and it won't power on without the power cord.

I think the logic board is good (brand new) but the Energy Star battery connector was used. Is the obvious problem component the battery connector, or is there something else that it might be?