My old Roomba vacuum only work 20 mines...

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Hi everyone, I'm new here just want to ask people who know which battery is better for my old Roomba 561? because my Roomba was lie down in the cabinet for almost a year. recently, I just want to clean my house but it only work for 20 mines then no battery, as i remember last time was 1 hour at least...I was checking internet and found there is original stock one with NI-MH like I had and the other one is un-original one with Li-on. but many people say Li-on is better than stock one. but I just afraid will be broken my Roomba. cost lot of money when I bought it. does any use li-on battery for your irobot roomba? Well, All after all. I found one battery on internet. Frankly speaking, my life is so busy during the day, when I come home from work; cooking, laundry, the dog and cat feeding……… a lot of work. So I pick up the vacuum to ease my duty that’s why I got my Roomba 561. I have been using it for half a year, recently, I found out that the battery’s working timing has reduced to 40 min. The battery is getting weaker, it cannot help me clean anymore so I put it into my storage room. Yesterday, my wife found this iRobot LI-ion battery from the Internet, I did not know whether a recently launched new products or in existence before. Anyway, this battery is cheaper than original.The apple green color battery, the stickers showing “notice, battery capacity, Production Company”. Place of origin Taiwan and then I took out my Roomba from the storage room and re-opened it.Installing new battery pack, seems to be a perfect fit.Pressed dock for charging,spent six to eight hours, the red light change to green meaning the battery power is full.Press clean, the iRobot clean my room.see my Roomba moving and works 4 hours up again. because I went out and left my Roomba cleaning, when I got home about 4 hours, my Roomba still working.This is a good battery can be continuously working for four hours better than Original, never seen any friends using this branding battery, I think I will introduce to you guys~ :)