APX8000 battery?

I have a personal "no tag" APX8000H (Yes I know, spare me the lecture..;)).... My dept just issued me a standard APX8000, but when I try either of my 8000H batteries, the 8000 powers up, but reports "wrong battery"... Are my "H" batteries possibly counterfeit, or are there actual different batteries? I went to the Motorola shop to buy some batteries for my new legit 8000, but can't tell which ones are compatible. TIA