I recently ordered a couple of new batteries for my precision M4500 and was very surprised to find that the built in test lights on the bottom are no longer present on the new batteries. This is disappointing as it is a useful feature and I am not aware of other manufacturers offering it.

Does anyone know the reason for the removal of this feature?

The battery in question is the 90Wh extended 9-cell battery type 4M529. I believe it is the same model used on the same vintage Latitude machines.