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what multitool do I want?
Keep in mind there are light, lower powered ones, and larger, high powered ones. Some folks claim the lower powered ones are more than adequate for DIY, and are easier to work with than the higher powered versions, as they are lighter and smaller.
Whatever you do, get a Brushless one. They run for longer, and don't heat up like brushed tools do.
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so I can dip toe in a different brands water to my other cordless stuff?
Not sure I understand this, but it's probably best to buy one that you have batteries for.
Definitely a cordless tool.
I got this brushless Dewalt DCS355N and am happy with it:
https://www.ebay.co.uk/itm/251990358151?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=6Us60OgNQOe&sssrc=2349624&ssuid=eEzv6s3FRC-&var=&widget_ver=artemis&media=COPY
Anyway, on an entirely related note - what multitool do I want? Cordless because I’m most likely to use in awkward spaces? They look to be different shaped/not system batteries, so I can dip toe in a different brands water to my other cordless stuff?