these are okay for the diy man or other light work. put them in a recip saw or something else that uses alot of power and they overheat, melting the connection between cells. even smoking and melting thru the case.
i have six batteries, three of these, (screw guns etc) and three dewalt. i am careful which batteries go in which tool
i have taken the batteries apart after failures and soldered new connections between cells.
you pays your money and takes your choice
bob