I'm ASSuming the answers would be yes to both questions, but then I did the same when I figured the original battery would work without problems too.
1) Will the new battery work with the charger that came with the series 1 battery?
2) Is the new battery water resistant enough to use in the rain without damaging it?
I looked on the Geomangear website, on the battery and in the envelope the new battery came with and didn't mention either question, but I figure I'm not going to be the only one with these questions. Even if it looks like I'm the first to ask them here.