I think I was tempted by the low price in my current Roomba 650 battery which was about 4 years old no it was still working fine I probably should have just left it alone! It's easy enough to install with that battery and works well and lasts about the same amount of time, but it never returns to base due to missing a chip or something telling the Roomba 650 that it's on. 5% that it's time to return to base. Now it randomly gets stuck all over the house and I have to look for it when I realize the battery is low. It's a bit troublesome, I can just put back the original battery, that's for backup.
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