It's just the understood thing that if your Ryobi battery has four flashing lights, it's dead and it's time to buy another. What if I told you that wasn't the case? There are actually a few things to try to bring a "dead" battery back to life—and one basically involves performing surgery on the battery. Here's what the lights actually mean, why it happens, and what you can do before recycling that "dead" battery and buying a new one.
