To be honest the BEST Cordless drill is the drill that
"feels" good in you hand... and is balanced to be used for long
periods of time without causing you to become a weight lifter

I have several cordless...and the one i reach for most of the time is
a 14.4 Milwaukee....my 18 V Dewalt is just too heavy .. BUT it too
has its uses...

The Milwaukee is getting old (at least 5-6 years) and the batteries
are just fine... The DeWalt is only 3-4 years old and its battaries
are also just fine...

Just my opinion

Bob G.