Geoman sent me a 3rd charger, as my original and the replacement one they sent me would not charge my battery. They tested the new charger with 3 separate batteries to ensure it worked. I received it quickly, charged it overnight, and tested the battery. It lasted 3 hours and 40 minutes before shutting down. The status light on the back of my light-head works now that the battery is charging correctly. I can't praise Geoman enough for their great customer service!