Hi everyone -
If like me you have been in the hobby for awhile, you will have accumulated a few tired Lipo batteries that are no longer of any use for flying as they discharge unevenly or too quickly or have become puffed.
I have a collection of batteries around that needed to be disposed of. I still keep a couple around that although they are no longer good for flying, serve well as "bench batteries" if I need to check any of my gear while building a plane.
I have asked several guys at my field how they dispose of batteries and answers ranged from "I take them to the gravel pit and shoot them" to, "I submerge them in salt water for a couple weeks" and then throw them out. The recipes for the salt water solution ranged from two cups of salt per gallon of water to two pounds of salt per gallon of water. So since I don't own a gun, I wasn't about to shoot my batteries and light them on fire and since the range of salt water bath recipes was so broad, I knew I needed to do some of my own research.
I found a couple of good videos on You Tube, this first one was proof to me that not only would the saltwater bath method not be quite as reliable to fully discharge the battery, it would be more messy and then I would be faced with the problem of disposing of the salt water that I would assume would be slightly toxic after a Lipo battery had been soaking in it for an extended period of time.
Then carefully, and I mean carefully while wearing gloves and eye protection, I put a nail through all three cells as the gentleman in the first video shows. I wanted to do this to ensure there was no reaction left in the battery. There was no reaction, no smoke, fumes, heat, anything, just like the gentleman in the first video showed with his resistive discharged battery.
I then left the battery outside for another hour to ensure there was no delayed reaction. I feel confident now that these batteries as shown below will be safe for disposal in the trash.
Be safe at all times!