Introduction
Replace a damaged or worn out Roomba discovery (4210) battery.
Tools
Parts
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Make sure Roomba is powered off.
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make sure Roomba is unplugged
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If your battery is bad Powering off Roomba shouldn't be a problem.
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flip over Roomba.
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Put Roomba on charge for 16 hours then run on MAX cycle to condition the battery.
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Conclusion
Remember to condition your battery