I have 655. It is advertised as suitable for 600 series models.Battery built in, no problem. Restart Roomba and install it on the charger. Received error code 1. Rebooted several times, same error. Check other battery retail websites for information on how to run Roomba until the battery is completely drained. (Unplug your charger so it can't be recharged) Done. I charged it again, still got error 1. I left the discharged Roomba without charging for 4-5 days. Plugged it into the charger this morning and Roomba restarted and is now charging. I will update this review if I have new problems. Minus 1 star for no troubleshooting or installation/usage instructions. Minus 1 star for falsely advertising 600 series compatibility and then Mfg stated in the FAQ section that it doesn't fit the 655.
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