Lidll

I ended up with the Fatmax, The hammer function got dulled out drilling holes in ridiculously hard flint-filled 1930s concrete, but it and the two battery packs are still going strong after... I was going to say many charges,, but the capacity is so great hat it's not actually as many charges as you would expect! Very rare to run one flat, I just swap over and top up after a certain amount of use.

My ancient B&D varispeed mains hammer drill (rescued when you could still take things away from the tip and cleaned of clogging gypsum dust) is still going strong for the heavy duty work, such as a 1" hole right through my workshop wall and many dozens of 6mmand 7mm holes for rawlplugs.

Neil

I have been remarkably impressed by a Macallister (B&Q own brand) electric screwdriver. Only about £14. No separate battery pack, but charges quickly, runs for ages, plenty of torque (although modest speed). Includes a torch in the swivel handle. Seems tough as old boots. If you pull the trigger in just a little it seems to lock the bit allowing you to loosen up very tight screws that make the motor stall if you pull the trigger right in, a handy undocumented feature.

When working on the workshop I've had a masonry bit in the mains drill, a countersink wood bit in the pistol drill and a PZ2 in the screwdriver, and this has sped up the rate of work by almost eliminating bit-swapping.

Neil

I should have googled before my post. They can go up to 4.2v per cell so with a bit of electronics they can be set for a constant max output.
Since 20v packs seem to be common now I wonder if it would be worth making an adaptor for my 14.4v drill with long defunct battery.