Knowledge among technical folk about rechargeable batteries and how to charge them properly can often be rather sketchy. And the situation among non-technical folk is even worse, with myths, hearsay and bizarre assumptions being perpetrated left, right and center. All this is despite the fact that rechargeable batteries are a part of many aspects of everyday life, and that most of us have the Internet at our fingertips as a potential source of accurate information. In this article we try to bring together the most important facts.