For some reason I can easily get my front lawn mowed with two 5 amp hr batteries so I expected to be able to mow the front and the backyard (same size) with two 8 amp hr battries. I run out of battery when 3/4 done on the backyard so these batteries do not appear to preform as rated.
I bought this high capacity battery for my Worx Landroid Vision XL. The robotic lawnmower is now mowing over 2 hours and returns to home charging station with over 20% SOC! It perfectly fits into the battery compartment and is also easier to remove since it is a little bit longer than the 5Ah battery - therefore easier to grab - Excellent battery!