OK. My P3 fell into the lagoon this morning. Got it out after maybe 5 min. And spent the day doing various things to dry it. Ongoing. But I know the battery is not safe now. How do I PROPERLY dispose fi it? I read that it should be soaked in salt water for a while , then take it to Home Depot or Lowes or Best Buy. Is this correct? And if so, how much salt to say 1 gallon of water would be enough?