PV panel draining batteries at night?

[stevehull]

This is a question for those of you that have made a PV panel or two out of wafers (made without a blocking diode).

Here is the experiment . . .

Hook up a panel to a storage battery with no controller. With light, there is current going into the battery. We all (hopefully!) agree.

What happens when you put the panel in the dark hooked up to the battery? I am not trying to reveal my bias, but can one or two of you do this for me and disclose that here?

The issue is, does a PV panel without a diode or controller, allow the battery to discharge into the PV panel at night?

Thanks in advance.

Steve