Sorry I can't recommend the DC987 because Dewalt doesn't make this model any more. I talked to 3 people about the replacement model and got 3 different answers, one was a14.4v.
Do your homework and I think you will be very satified with the dewalt products.
Pros: Works great, I own 2 of them.
Cons: Batteries don't last too long on extremely heavy duty use.
I REALLY LIKE THESE BATTERIES. I HAVE USED CORDLESS TOOLS FOR A LONG TIME, (20 + YEARS) AND HAVE USED MANY MANY BRANDS OF BATTERIES AND THESE DEWALT Nicads ARE THE BEST BY FAR. THEY HAVE LONG RUNTIME, LONG LIFE , (I HAVE A COUPLE OF BATTERIES THAT ARE DATED 2003 !! ) AND ARE VERY DEPENDABLE. I USE MY TOOLS PRETTY HARD SOMETIMES AND THESE BATTERIES HAVE NEVER LET ME DOWN !!