I'm a little late to contribute to this topic....
and I have only ever used my drill for drilling and as a superb screwdriver, so no experience of hammering things into hard standings (although the hammer function made short work of a concrete lintel which others drills had only managed to scratch
I bought it a couple of years ago from Screwfix,( they are still available) its made by Titan is quite light and small in form but very powerful and has been excellent in every way. I have other Titan equipment and it has all been of excellent quality. the drill cost £49 and comes with two batteries (18V) as standard and includes the usual nifty LED light that is so helpful when drilling in dark corners or at dusk!
The torque setting is easily adjustable ( so no sprained wrists!) and the Li ion battery charges in under an hour. I have only used the one battery so far and it doesn't seem to have deteriorated in the last two years. The second battery is still in its cellophane wrapper, as I thought I would keep it this way until the first reaches the end of its service life....this may be the wrong approach, but time will tell.!
Usual disclaimers, I have no connection with any of the folks involved ( other than as a happy customer.)
Regards to all, and always
Happy Caravanning
paws