You'd do well asking for advice on r/DIYUK, a similar question was posed earlier this week.

I personally have found Erbauer's range of battery tools (Screwfix own brand) to be well made - I've not had to disassemble any yet to look inside but they've withstood a lot of abuse at my hand! They don't do a light drill driver type thing, only 18v an multidrill. For space saving you'll want to buy one tool in box with battery and charger, and then expand buying bare tools (and perhaps the occasional additional battery). The chargers are wall mountable (mine is inside the cupboard under the sink) which saves counter space.

Equally Aldi's Ferrex branded tools have stood up to similar abuse at the hands of my sister - they had a 9 month period of terrible battery availability (and online reviews tend to reflect that strongly), availability of specific tools is semi-seasonal but they've been online throughout the last year (possibly because of the lack of batteries meaning nobody was buying them).