Have deliberately not Bundles with battery purchased. Instead, I bought the 4-Ah battery separately. Conclusion: I do not like to imagine how quickly the device would empty the weaker batteries. I can hardly imagine that without the 4-Ah battery a meaningful work is possible. My previous runtimes with the grass trimmer and the 4-Ah battery: about 30 minutes.
So: Stay away from the bundles, because in my opinion the stocks are sold off on small batteries with here.
I am of the concept as a whole so impressed that I intend to gradually replace my other garden tools by Ryobi 18V tools.