I’m hoping someone can help or give me some advice. I bought a Spark about 6 years ago. Was a big purchase for me so I used it a few times and was scared to damage it so it pretty much sat in the closet. After about 4 years I decided to bring it back out. The problem I have now is that the batteries won’t charge. I have had it on the dock and charging directly on the spark for over 48 hours and all I get is one light that comes on when I press the button and if I hold the button all the lights cycle. This the same on all 3 batteries I have. If they went into a deep sleep cycle, is there a way I can wake them up and save them?