i believe some people are complaining of boot loops with these batteries, but that may be from the old stock.
they charge when in the phone... but i have noticed that on the first charge, the battery drains a bit faster. the phone was idle for 80 minutes (screen not turned on, no wifi, 3g, or anything major running in the background) and i lost 7% battery life. original battery would lose probably about 1%-2% in that time. also, it took about 2 1/2 hours of me leaving the LED flashlight, screen at full brightness, and wifi on to drain to 5%. that's not terribly bad at least.
will wait for 3-4 more cycles to see how it all works out.