All I buy any more in cordless is Li. Metabo now has a battery with 5.2 Amp hours.
http://www.metabo.us/NEW-Battery-pack-with-5-2-Ah.47683.0.html

In the past 30 years I have lost count of how many cordless tools I have thrown away, but I started using Metabo before they were available here and I had to use a step up transformer to charge them.