I bought this drill/driver maybe 5-8 years ago. I replaced 1 battery a couple of years ago and am getting ready to replace again. The store I bought it from thought I might like to upgrade to the new 12 v drill/ driver. So, I bought it charged the batteries as directed and put it to use......Two days later I took it back. It did not have half the power of my CHT1202k2, even when the battery is almost dead it still has power. So I'll keep replacing the batteries as long as they're available.