Koepi:
Jeez, some have the info right, others claim dangerous BS.The "charging circuit" is really evil. The battery is otherwise connected correctly.
See the schematics here:Remove the 1N4148 and/or the 200R resistor and everything is fine.
I also removed the power LED as I use the RTC for a DIY clock. Works great this way with 3.3V supply.
(click for bigger image)
So... Dumb question... How do I remove the battery that I currently have in the module? I've got an LIR2032 in there and it's a pretty tight fit, not really much room for me to stick something underneath to pry it out. Also, the battery should go in with the negative terminal facing down and positive facing up, is that correct?
EDIT: So I figured out how to remove the LIR2032 and replaced it with a CR2032 I bought on amazon... The LED did not light up. I'm assuming that the LED should be lit when it is powered via the battery, and I probably ended up with a bad batch of batteries...?