Based on the product description, it does not mention anything about battery degradation over multiple charges. However, it does state that the battery has 'remarkable durability'.
Based on the product information, it is compatible with Happybuy 20V chargers. For compatibility with other brands' chargers, I would recommend consulting the manufacturer or expert.
The product information indicates that this battery pack is compatible with VEVOR 20V cordless power tools, but does not specify if it works with older models. I did not find any reviews providing further insight into compatibility.
