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![Do the grime and markings on the battery terminals mean it's probably time to replace it or do they just need cleaning? Roomba is currently not taking a charge. Older Roomba 780. : Do the grime and markings on the battery terminals mean it's probably time to replace it or do they just need cleaning? Roomba is currently not taking a charge. Older Roomba 780. :](https://i.redd.it/iay545dkoyk51.jpg)
Do the grime and markings on the battery terminals mean it's probably time to replace it or do they just need cleaning? Roomba is currently not taking a charge. Older Roomba 780. :
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Battery for Irobot ROOMBA 780,replacement Irobot ROOMBA 780 battery for Vacuum Cleaner from Singapore(4500mAh,12 cells)
![CELLONIC® 11702, VAC-500NMH-33 Battery Replacement for iRobot Roomba 960/605 /650/620/ 780/880 Vacuum Cleaner 14.4V 3300mAh Cordless Handheld Robot Vac: Amazon.co.uk: Home & Kitchen CELLONIC® 11702, VAC-500NMH-33 Battery Replacement for iRobot Roomba 960/605 /650/620/ 780/880 Vacuum Cleaner 14.4V 3300mAh Cordless Handheld Robot Vac: Amazon.co.uk: Home & Kitchen](https://m.media-amazon.com/images/I/71bah+n78HL.jpg)
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