Why is my Roomba 870 only running 20 Minuets?

Why is my Roomba 870 only running 20 Minuets?

Okay so i have a Roomba 870 & i also have a 560 ... i have been charging them and testing both to see the run times ... My 560 runs for an hour sometimes more ... But my 870 Dies with in 20 Minuets "( .... Ive done everything to troubleshoot this issue ... Ive switched batteries between the 560 & 870 ... 870 still dies even tho the 560 ran on that battery for over an hour ... Ive even bought a brand new battery ... still dies in 20 minuets ... i have used 2 different docking stations, which work fine on my 560 and they do charge the 870 so i know that can't be the issue ... I have done the 30 Second reset holding the power button with the battery in & out ... I am loosing my mind trying to figure this out, If anybody has fixed this or knows WTH is going on PLEASE PLEASE PLEASE Help me out !!!

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bert [Entry]

Mine is the 800 seiries. It had a short run cycle, going dead quickly and not cleaning well. It recharged to green in less than 2 hours. I tried all of the tips I found online for a through cleaning and battery reset. My cure was that I found lots of hair inside the roller brushes- under the yellow cap on thier axle. This was a big power drain. The yellow cap pulls off and the post that it was attached to pulls off. This allows access to the gunk. I did check the other end of the brush rollers. That side does not seem to come apart, but I was able to see inside and it was clean. I also ised a needle to clean out a wad from under each rubber tire. Our Roomba works now.