Tools and techniques
Robot lawn mower question
Batteries are not interchangeable amongst different brands.
I have Einhell tools, and many spare Einhell batteries, I feel almost obliged to keep buying Einhell. I could buy only the tool, the battery I have it already.
I'm happy with Einhell but I hate being kept at ransom....
Btw the batteries do not last for ever, after a number of cycles you can only dispose them.