I bought 3 sets Tronsmart Spunky Beat Bluetooth Earphones, since I liked the first one. However the second one had a problem from the very beginning: it did not disconnect from the phone while in charging case, and therefore drained the batteries. The other 2 worked fine.
After some year (with almost no use, since I purchased Shokz that I love) it seems that the batteries died-- they stopped to keep charge at all. Or maybe they stopped to charge at all: i don't really know. But they are unusable.
Bottom line: it seems that there are problems both with with firmware and batteries. Do not recommend.
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