Thought this would be covered, but I saw some warnings on checking polarity of the connections before using a battery... How does one know? Is it printed on this back? Is it written against the PCB?

Thanks for the assistance!

Hi. Any idea when the next batch will be available? And how do I pre-order one? Thank you Not sure yet, I might have some left overs from a deal I made with a local guy who builds complete systems but this might be towards the end of this week after I discuss things with him. For everyone else all ...