Is a 1500mAh battery compatible with a 1.24 Ah battery?

ewkpates, what you have, is a battery with a bit more storage capacity. 1.24 Ah= 1240mAh since 1Ah=1000mAh. As long as the connectors and the rest of the physical dimensions are the same, it will be okay to use. I believe that there are just to many different manufacturers and sellers to add anything like this to the guides. Since anybody can edit the guides and place notes on it, you could post a note about which battery you got and add the seller and the number. That will then help the next person....;-) Hope this helps, good luck