I have to put a new battery in it once ...
592748
I have to put a new battery in it once a week. I have used these before and never had them use up a battery this quick
2085994
Battery that was packaged with it, only worked once. had to change the battery, but since then it works great and I have been using it for months on the same replaced batttery! Easy to clean and store.
2657011
I got it on time but one of the batteries are damaged. As I placed it on the wall charger it repeatedly popped out as if It didn't fit. As I observed The battery I noticed the bottom of the battery was shifting slightly Not allowing it not sit properly. The wall charger works, as well as one battery.
136829
I had to buy new battery right after couple of rides. Other then that it's great for the amount I paid for
1723971
Like your mobile phone, save some money, and buy it a new battery. Your phone's charge will last just like it was new.
4318015
New battery means more time on the road... Not that easy to change, but did manage.
3747690
I used this a few times in the past year, and the battery is dead and will not recharge.  My husband got to tell me "I told you so".  Other problem is how to dispose of the Lithium battery.  As a scientist, I was involved in researching Lithium batteries when I got out of college, and I no how dangerous lithium is so I suppose this will be stored in my garage until my decease.
4216759
One time only use it says you may reuse, battery leaks due to a pin hole some place after all it is made in china :(
4209610
I bought a new battery because my old battery would only last a little over an hour and it would be dead. I had that battery for a few years.
This battery is 4 months old and already is only good for 1/2 hour. Didn't last very long. Time for a new battery and it won't be  a power driver.
It's funny, the old one is still on my desk and I noticed that the old one is 600mah and this new one is 800mah.
So for the heck of it. I put the old one back in and it lasts about 45 minutes.
4551758
good price.i have had battery come loose and i had to reposition the battery on it two times so far.
3582012
It came with the battery installed and while I was messing with the settings I dropped it.  The setting procedure is really backwards and I had to start over about a dozen times.  That's when I dropped it.  I think it might be the battery.  Once I hunt down another one if it still doesn't work then I will be disappointed.
1226494
New battery has to be put on charge 2 to 3 times a day. My old battery will still hold a charge all day. I made a mistake purchasing this item. Never again!!!
2696000
however, when i got this product, the spare battery which was part of the item isn't working and i can't get just that replacement.
284788
Dropped it into my Roomba 500 and it was good to go.  Parked itself in the recharge base and was soon ready for the first room.  Once the battery was inserted, I had to fold the black ribbons tight on top of the battery to get the Roomba bottom to fit snugly enough to reattach.  This might be common but I had never put a new battery in the machine before.
3463223
I took a new battery this thing said it was dead.  NOT IMPRESSED
4516293
It is a lack of respect that only worked for a year and now when I read here they say I have to make an invention to change the battery, it is not fair or logical, it is a product that is not cheap to have it thrown out just one year of your purchase.
1829392
one bad (dented) rechargeable battery. connections in battery compartment not secure had to fix it.