I've found the reason that some people aren't getting these to work correctly. The holes that the terminals fit through the battery are too small. They don't have enough room for the contacts to fit up into the battery correctly. If you take a small exacto nife and make the holes a bit wider, the contacts will fit better. Also since they also appear to be slightly "inset," you might need to fold some paper on the cover to push the battery up a bit higher. The battery itself works OK. It's just a slight manufacturing problem that should have been tested better. I hope this helps. I would have rated it higher if it would have been plug and play.
Verified purchase: Yes | Condition: New
Wrong battery, faulty charge station also. Battery states it's for the 500 series Roomba and it's only 4,500. nah. The proper battery for the Roomba 650 is made by Roomba. Charging station will not charge the 500 series battery. I had to invest in a Roomba 1,800. Nah and waiting for a new charge station from "Always Deals"
Verified purchase: Yes | Condition: New
I was Leary because the batt. Said for 500 series Roomba, I have an 870. But the battery is working well! Perfect fit, lots of power! Did the whole house and ran for 45 min with juice left over.
Verified purchase: Yes | Condition: New
My Roomba 770's original battery it's slowly dying so I got this replacement battery and it's a straight drop in. Charge it up and it works like a charm! The battery was delivered in a couple of days.
Verified purchase: Yes | Condition: New
Rooba would not hold charge, so I bought this battery to replace the one I had. Roomba is now working again
Verified purchase: Yes | Condition: New
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