Why won’t roomba take charge?

I have an iRobot / roomba 860

The original battery would no longer take a charge. I purchased a new battery on eBay.

That battery worked ok for a while then I kept the base unllugged for a while and it must have completely discharged.

I purchased another battery. It worked for a while but now is no longer taking a charge.

I was careful to keep it plugged in and not discharge. We’ve had the roomba for about 8 years just wondering if anyone has run into similar issue and if something might be wrong with charging mechanism inside roomba ?

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@frankd31311 sopunds like your Roomba is just not charging. It runs with the new batteries for a while since those have an initial charge. Have you checked the voltage on your base? Have you checked the contacts to make sure that those are clean etc.?

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