If you want one cheap, I have the recommended Bosch’s green brother going – fairly light use as I still have its predecessor down south where I used to do most of my work, which is about 10 years old and going strong, but foolishly I decided to invest in a pro grinder for my new house refurb I am just getting into, which I thought would use the same batteries, but turns out it doesn’t, and the cheapest way to get some is to buy that drill posted above! Its cheaper than the batteries and charger alone.
Its this Drill but my one comes with 2 18V 2AH cells (rather than the 1.5s listed on this one) and the charger, boxed, all pretty much as new. £40 posted if you want it.