When the blade experiences high resistance from tall, thick or wet grass it requires more energy from the batteries to cut the grass. It matters also whether the blade is sharp or dull. More energy required means faster battery depletion. That's why a robot can run for 4 hours on one lawn but only an hour on another.
slowing him down because he could not run as long and then ended up charging during prime dry grass time.
I agree with every thing you are saying. But also what is true, is that Billei was set to mow 24 7 from almost day one. and always stayed out 4 + hours. and you could not find any spot that he missed. Except when he was broke down. That was until a few weeks ago. now there are big patches that are not mowed. All advertisement said he would do up to 1 1/4 acre.. I am not asking for anything more than what I was told when I made the purchase. I expect that he should run for a season in fact several years with nothing more than blade changes and cleaning. Anything less is unacceptable.
I saw nothing in advertising that said the grass had to be dry, thin or any other conditions.
My understanding is that robot mowers are not in fact mowers. They are maintenance machines. Made to run on a continuing bases and only cutting about 1/4 inch to maybe 1/2 inch.
The big problem with short runs other than not being able to keep up with the maintenance of the lawn is that every charge reduces the life of the battery. So at a 2 hour run time the battery will charge 4 3/4 time in a 24 hour period. versus about 3 times with a run time of 4 + hours.
