I have been surfing around the net lately and have heard a good amount of people say that for the Incredible an external charger and second battery is one of the best options as it allows the user to avoid the bump charge. Now my question is has anyone bought one that they really like and has not ruined their battery? I have heard that some of the super cheap Chinese knock-offs will have uncontrollable charges that at times can exceed the normal charge voltage and ruin the battery. So has anyone purchased both a secondary battery and external charger that they really like and has not ruined anything yet? I ask because I saw that on Ebay you see a large number of auctions with 2 batteries and a charger for $10 shipped. So just wondering what you guys like.