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I had some solar path lights and discovered, before constant battering from harsh UV destroyed the plastics, that the factory NiMH batteries were junk, only 800mAh capacity. Just because I had some hanging around, I replaced them with some off-the-shelf Energizer rechargeables. It made a huge difference in brightness through the night, and they would go three nights in spite of nonstop overcast. Big, big difference.
It makes me wonder what you'll discover about your factory batteries in the Roomba.
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Lead or follow. Either is fine.
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