As an Amateur DIY person, I am happy with the Aldi/Ferrex brand stuff, they (Like Lidl/Parkside) use Samsung battery packs. Light, easy to charge, and I have a brushless angle grinder, also a chainsaw, impact drill, and hedgecutter. I have enough battery packs in reserve for any task that comes up, they have been reliable enough for me and my usage. I also know they have a decent guarantee on the items, and can return in store with no fuss if required. beats getting out the extension lead all the time, especially in the garden, a 50m extension lead will not be light, and take a bit of time to spool up again at the end of the job. I can fully understand that professionals would choose differently, they will be using them hours per day, unlike me. It does not matter if it is aldi or lidl, for amateur use either will fit the use case quite well and at a similar outlay. If it was a no name chinese battery pack, I would be watching the entire charging process for safety...