I'm sure it's not so good to press 2A into the device.
High charge voltages, excessive charge rate and extreme load conditions will have a negative effect and shorten the battery life. This also applies to high current rate lithium-ion batteries.
Keep the lithium-ion battery cool!! Avoid a hot car!! For prolonged storage, keep the battery at a charge level of 40%!
When you don't use it, you can keep it into you refrigerator! (No joke!!) [Keep it dry! ;)]
You can use this for charge:
[Blockierte Grafik: http://img207.imageshack.us/img207/3360/imageresizersx1.jpg]
The best is, when put it over night on your USB-PC-Port. [500mA]
[Blockierte Grafik: http://img207.imageshack.us/img207/77/parttwo34xh2.gif]