Samsung SCH-A670

I purchased the samsung a670 and i got the extended battery. I just wanted to know if this phone has a detector that when you charge it and it is completed, it doesnt over charge and damage the battery. Im not sure what the actual term for this is...but would anyone know the answer to this? Becuase the new phones like the 710 have this feature, where once the battery is completed, the detector or wall, doesnt allow anymore electrons to go through...therefore you can never overcharge and ruin the phone and battery. If anyone knows the answer to this, please get back at me. Thanks a lot.

PS. Wats up wit the low ass ringtones?????