Okay, I went through a bunch of gotchas when I upgraded to LiPos. It's never just the battery. Here's my experience:

(1) bought some lipos and needed a way to charge them
(2) bought a charger (another $100 or so, but it's a nice 4-port one). Turns out the charger doesn't just plug into a wall. It has alligator clips where you're supposed to hook it up to power.
(3) bought a AC/DC power supply to plug the charger into. Turns out the voltages are wrong so the charger just beeps errors at me
(4) returned the adapter. Guy at the LHS says, just buy a sealed battery and charger instead like this one http://h1070999.hobbyshopnow.com/pro...asp?prod=HAN19. This is a two-stage process: charge the sealed battery for 10hrs, then use that battery to charge the lipos. Turns out the battery+charger combo was cheaper than the AC/DC power supply anyway, and at the price of having to charge for 10 hours, I get 6-7 lipo recharges that I can do in the field
(5) Had to make sure that your lipo plugs match the motor plugs. I got LiPos that just had two wire leads and had to attach a JST connector to it.
(6) the charger's ports were banana clips that I had to adapt to JST as well.
(7) Then I found out that each of the cells in any particular LiPo could go out of sync voltage wise, and if they got way out of sync, you could over charge them and cause it to catch fire. Fun. so, I was introduced to the world of balancers.
(8) Bought a thunder power balancer

I know you can buy chargers with a built-in balancer, but I didn't know that at the time. It is possible to manually balance a battery if you have a voltmeter and some sort of load (like a motor) that you can use to drain individual cells. Ask me how if you want to know, but using a balancer is more convenient.

Need to knows:
* don't overcharge them. They will catch fire
* don't overdrain them. You will ruin the battery. Use something like HRPOLY-X alarm circuit to warn you when you should land.
* don't let them get too cold. In the field, keep them in your pocket.
* don't be far away when you're charging them.
* when charging, place them on something that's not flammable away from anything that's flammable. I put mine in a ceramic bowl in the middle of my tiled floor.
* if you crash, inspect the battery for damage. If it's damaged, don't just throw it away. Throw it into a bucket saturated with salt. Leave it there for a couple days.

That said, I've yet to have a lipo flame up on me (knock on wood).