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If you go with big brand like DeWalt or Milwaukee or whatever, extra batteries can be used with all kinds of aftermarket stuff like power supply clips (make it a huge power bank), or cheap AliExpress/Temu tools like my hot glue gun, which totally rocks as a cordless tool compared to the old mains shit.
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Thinking on it I reckon dbr was right. The 12v Bosch is smaller, lighter and from watching a couple of videos will cover your needs. It's not brushless, but my now nearly 9yo dewalt combi is brushed and has handled all general DIY including drilling into concrete (albeit slowly). I've never struggled with running out of battery for drilling - it's routers and Multi-Tools that kill batteries.
The downside as I see it is that the bare tools for the rest of the 12v range are relatively expensive so you're not particularly benefiting from being in that battery system. And some might not be up to bigger jobs -altho that's a guess, not experienced.
But in the event you start doing bigger projects requiring a bigger range of tools then you can buy into another system down the line and having a light combi will always be useful.
Actually I googled that baby bosch blue dbr recommended and found it for £75 here
https://www.campbellmillertools.co.uk/products/bosch-professional-gsb-120-li-combi-drill-2x-2-0ah-battery-in-case?srsltid=AfmBOooYRbfXqFQiBxhbHbEmCPU1Pe5jZ0IRKQxQ3Ce7_3Wvjd1yt-IA
I'd probably do that. Unless you think you'll need to drill into brick or concrete, then I'd get the DeWalt.
Also the Dewalt doesn't have a box/case and Imo for general home DIY that's actually quite important.