Hoog, I wrote you an email but didn't get an answer so heres the deal I bought these 2 18650 3000mah batteries a couple of months ago and didn't get to that mod cause I was working on some smaller ones. Anyway one of the batteries won't charge. I think it's probably the protection circuit is bad. The other one is fine. I don't blame you if you don't warrantyit cause of the time but thought I'd check before removing the protection on the battery to see if that works.