Its arguable that the ordianry home shop / DIY person needs better than inexpensive bottom of the range battery kit as such should be better able to cope with infrequent use. In our hands age out is more likely than wear out.
A better breed of machine should look after its batteries better than a made to a low price device. This was especially so with NiCad batteries. Modern lithium batteries are more tolerant of sitting around but better breed charges do look after the batteries better.
Round about the time Screwfix started selling their own brand Embreur(?) tools a friend of a friend switched to those for onsite building work. He reckoned that good breeds, professional DeWalt, Makita et al weren't value for money as they would get broken or nicked long before batteries or drill wore out. The cheaper ones he treated as throw aways. New ones every few months.
I went Makita NiCad for my home kit, special offer price of course, and never regretted it. A friend who went the lower end route, Screwfix in house or similar, ended up spending more than the difference on batteries which rarely managed a year.
I've done the open the pack up and fit new NiCad cells thing on my old Makita battery packs. Marginally worth it. Once.
I've since gone all Makita 18 volt sharing four batteries between hammer drill, 1/4 hex impact driver, twin battery hedge cutter, twin battery strimmer and 1/2" drive heavy duty impact wrench. 18 months in and "Quality remains long after the price is forgotten" seems to apply. Works for me. The big Makita 1/2 drive impact wrench is a total beast!
Never understood why all the cordless drills have such crappy chucks that self loosen when using hammer action.
Clive