I somehow lost my charger, spare batt, and speedlite for my Canon 40D. I'm really pissed because I don't know how this could have happened. Anyways, I need a new charger. Amazon has a generic for CHEAP [ame]http://www.amazon.com/Canon-EOS-10D-20D-30D/dp/B00192MT5M/ref=pd_bbs_sr_2?ie=UTF8&s=electronics&qid=1224031704&sr=8-2[/ame] and one made by canon [ame]http://www.amazon.com/Canon-CG580-Battery-Charger-Batteries/dp/B0000C47QH/ref=pd_bbs_1?ie=UTF8&s=electronics&qid=1224031704&sr=8-1[/ame] with a huge price difference. Is there a difference in charging quality? The actual built must suck because its from china, but would it damage my OEM battery (bp511a) in anyway?