How much current does a bad energy storage battery have
All 18650 batteries can be charged with a decent 18650 charger, UNLESS the battery is junk. I have an XTAR and have consistently charged 18650s from numerous providers. Try the charger with other 18650s if it consistently works on other batteries you may have a bad cell. If the charger is random on all batteries, you need to get a new charger.