Tesla may argue that it's being proactive by replacing Model S wall charging adapters, but that still constitutes a recall by most anyone's definition. Accordingly, the company has sent a letter (PDF) to the NHTSA announcing a voluntary recall of the 29,222 first-generation adapters that theoretically pose a fire hazard. As before, Tesla stresses that the adapter replacement program is a "precautionary measure" -- an earlier software update addressed the underlying problem by accounting for unexpected changes in power input. The formal notice doesn't change much (if anything) for Model S drivers, but it at least means that the right authorities are aware of what's happening.