Diagnostics with bright LED indicator communicates battery charge status: charged, charging, power problem, and battery too hot or too cold Dewalt batteries should have a 3 year warranty from either a receipt or the build date on the battery. I'm not familiar with the charger warranty but it must be at least a 1 year warranty. Ive sent a few in to a factory service center over the years without a receipt just using the date code on the battery and they send out new ones. I've also heard of people just calling Dewalt and they just send out new batteries. True, I've gotten no questions asked replacements for both a DCB102 dual-port charger and a DCB204 4Ah battery. I called a service center for the charger, which requested that I send it to them but told me that DeWalt would replace the charger instead of having them repair it. Sure enough, I got a new charger a few days later. The battery was the one I mentioned above. before I found that it was corroded, I submitted a warranty claim with the manufacture code to DeWalt and they sent a new battery immediately.