Home DIY

I’m a purist/snob/paranoid.

I don’t know if the knock offs have the same cut off capability. Don’t want to shag tools/batteries.

I got a 1.5Ah Makita lookalike, to see how they faired before getting two replacement 5Ah.

It's a good time likeness for the packs without the led indicators and seems to charge, click in and work OK.
However I don't think the BMS is a good as the originals, as you can still use the tools to the point where they slow down to a crawl, whereas the Makita cuts out before its completely flat. I doubt it will last as long as the originals, as Makita put a lot of their efforts into the motor/battery/charger.

Don’t want to shag tools/batteries

Don't forget that lithium ion batteries have a tendency to explode/catch fire if overheated or subjected to impact. The tool manufacturers have spent a lot of money developing their battery packs and manufacturing techniques to virtually eliminate these problems can the same be said of chinesium knock offs? The last time I looked to renew my tradesman's insurance 2 of the companies who quoted had a clause that invalidated my policy if I left batteries charging overnight in client's properties, which implies it's not an unheard of problem.