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It could not be making good contact with the charger.Check the contacts on the unit and the charger-sometimes the connectors get bent or something is stopping the circuit to complete. Wiggle the device while it is on charge and try to make the light stay on.
Cradle and contacts are fine. Cradle circuit is nothing but a reed relay and few wires, relay closes on proximity to robot's body, therefore no voltage on contacts before robot is close to cradle. There is a thermistor inside of battery, and mine was bad. I removed it and now I am charging the battery from my bench power supply at about 220 ma current, overnight, and it works. Probably the solution is to get a new replacement battery, but the one with the thermistor inside (OEM), easily recognized by the third wire, and all should be fine, assuming that nothing else is wrong with charging circuit or power adapter (12v/1A) Hope this will give you some ideas of where to poke. Once successful, please post your solution.
I had a similar problem when I bought an after market 2Ah battery. Would stay solid red for a few seconds then flash red. I believe my problem was that the battery had gone into "sleep mode" I.e. it was discharged to the point that it "sleeps" in order to protect itself. So......I simply attached a domestic DC multi adapter to the terminals on the battery that are marked + and - (the 2 outside terminals on a DC16 Dyson battery). Switched on the DC adapter for around 10mins and this was enough to "wake" the battery. It now charges as normal attached to the DC16 in the Dyson charge mount.
For a pretty in depth article on lithium battery sleep have a look at this:
You have dead nimh (nickle metal hydride) batteries. You
will need a replacement. You can test for this by removing the battery
and holding the power button for 15 seconds. This will restart the
charging cycle as if the battery were new.
Try resetting your Roomba by removing the battery, unplug the charging
connector, hold down the Power button for 30 seconds. This will reset
the charging system, replace your battery, connect your charger and see
what happens. By the way do you also have a homebase ? If so try that
I did the same thing,I charged for over 12 hrs and it run for only few seconds then the red lights comes on.I was on the process of replacing with a new battery till I got in to this and I guess I'll leave it alone rather than wasting money for a new battery.
Same thing happened to me, I called the company, and they told me to remove the battery, press the on button for 5 seconds, which clears the system, replace the battery and do a long charge 12 hours. I'm in the process of doing that now.