The problem, I'm afraid, is that you've purchased DeWALT.
I don't mean to start a "who makes the best" argument here, but in the past 12 years I've spent with power tools, especially the last year on the jobsite, I've noticed severe degradation of the DeWALT brand. My employer, who's been an electrician for 30 years and self-employed for 14, has noticed a similar trend. Several of our old DeWALT tools have been replaced with Makita, which offer better longevity, more power, and lighter weight, at the expense of somewhat reduced availability(DeWALT is still the most marketed "professional" brand). And, if that Milwaukee M18 band saw we just picked up is any indicator of Milwaukee quality, they've got something special going on too.
My boss was actually toying with the idea of kitting out the new work van with Milwaukee stuff. Our senior j-man still has a full collection of older DeWALT stuff, and me and my j-man share a collection of older DeWALT/new Makita stuff, while he has nearly all new Makita tools. With a fourth vehicle getting on the road, he's considering loading it up with Milwaukee and evaluating the difference, so that when it comes time to replace the DeWALT stuff(which will be inside a year, judging by performance), he can make his decision based on hands-on experience.
In response to your question, I'm with Bryan. A battery charger is widely available and fairly inexpensive. In my opinion, less hassle to just pick up a replacement.