I bought 3 lithiums on Amazon , Tried to save some cash. They worked great when they worked. sometimes one or more would test
dead after charging. Let them sit long enough and they would test full charge. I think they were shutting down after charging for some reason, My charger is supposed to be good for Lithiums . they have been sitting on a table in the garage
for 6 months and they all tested full charge this weekend, I tried to return under warranty , my requests were answered by email
asking me to do all sorts of testing , which I am not equipped to do. So they sit as a reminder..

good luck
MO