I have a pair of Q20s that I bought in November 2020. I have only needed to charge them twice since then as I don’t use them often. A couple of days ago I tried to charge them again. When I plug them in, the light flashes red ONCE and goes out. They were on the charger for 6 hours and refuse to get any higher than “Battery low” when announcing the level. I’ve tried other cables and chargers that work on other devices.