I have an iPhone 4 and an iPad and on both these devices, the battery life drains way too fast. It's worse in the iPhone, I can leave a fully charged device over night, but when I come to collect it in the morning, its down to 40%. The iPad will lose between 25-35% charge if left unattended for the same duration. Does anyone else have this problem? Edit: that should be 4.2.1, I can't change the title.