Question about iRobot Roomba 4210 Bagless Robotic Vacuum

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Battery light goes red after bumping/backing up

This just started. After running just fine, and running completely out of battery "juice", I recharged the battery and set the Roomba down in another room. I started it up, it ran to a wall, bumped and immediately the battery light went red. When I put it back in the charger, it went green in less than 1 minute. I ran it again and it bumped into something, backed up and went red. I took out the battery pack, cleaned the contacts and some dust/lint, popped it back in and the light went green. Restarted and the same result. Any ideas?

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Re: Battery light goes red after bumping/backing up

Try this: turn it upside down and run it-then bump it to reverse it...same result?

Posted on May 29, 2007

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Rechargeable vacuum cleaner, 2years old, battery will not charge, when in place for charging the middle light shows red for a while then goes out, filters cleaned all in place, any suggestions please?

When the batteries fail they typically do not accept and hold a charge which is the problem you now have.

If you can purchase a replacement battery, and as long as the batteries are replaceable in the appliance (some are not), you can run the cleaner again..

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Brand new first charge The green light on the charger plug goes off after a short time. Is the unit still charging?

Once the green light goes off, it's done charging. Since it was first charge I know they say to charge it 8? hours (or 4? don't recall right offhand) but it does come charged (that's part of how they make the batteries). What you do want to do is remember not to always recharge it when your done using it. Use it till the battery goes flat, then recharge it; it will give you a longer battery life that way.

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New Roomba Battery Not Holding Charge - charged once then died

It is possible for the charging system inside the roomba to call it quits. What I did to remedy this, since my roomba was out of warranty and I did not want to scrap it, was to buy a charging base on ebay. This charging base accepts different types of roomba batteries and even the scooba battery. The inconvenience is if you have a newer model roomba that has the battery inside, then you will need to remove the screws on the bottom plate to remove the battery. Hope this helps.


Jan 23, 2014 | Roomba Robotic Floor Bagless Vacuum

1 Answer


Hi there,

I'm sorry to hear you're having difficulties with your DC16. A single flashing red light indicates that the battery needs to be recharged. When fully charged, all 3 LEDs should illuminate without flashing. However, if the red light continues to flash even after at least 3 hours recharging time, there may be a fault with the battery or charger assembly.

Please get in touch with us directly - one of our experts will be happy to run through some troubleshooting over the phone with you to determine whether the battery or the charger requires replacement. You can call us free on 08002980298 (UK), or 1866MYDYSON (US). We'll look forward to hearing from you.

Kind regards,

Dyson Online Customer Support

Jul 18, 2011 | Dyson DC16 Root 6 Bagless Handheld...

2 Answers

When to recharge batter

hi right to be honest both ways are correct, but if your using it every day then its best to put it back on the charger after every use, but the problem with this is that the battery never goes totally flat, so never does a full recharge this reduces the life of the battery by upto 50% so if you are using it regular and need it charged daily then its best to once a month let the battery go totally flat so that it wont even make a sound then do a full recharge.
Doing this will ensure the battery remains at peak performance and make it last longer.

If how ever your only using it say once a week then its best to only charge after the battery has gone flat due to the fact that it would remain on charge longer and cause the battery to over heat reducing the life span of the battery.

But witch ever method you use always let the battery go totally flat once a month then do full recharge this will prolong the life of the battery and ensure it keeps working at full power.

Let me know if you have further questions ok

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1 Answer

My dc 16 rechargeable vacuum won't work

far as i know the dyson dc 16 root 6 vacuum uses a lithium ion battery with a charge of 21.6 volts. it could be that either your battery isnt storing the right amount of power anymore and you may need to replace it. check on the specifications to confirm how much volts the battery is supposed to have. too little volts may be enough for things like lights to switch on, but not enough for the motor to start up. 

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Backs up spins in circles, then red light flashes and beeps

Sounds like either the battery is bad or not being charged properly with subsequent loss of programming.

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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.

Dec 14, 2007 | iRobot Roomba Red 4100 Bagless Robotic...

1 Answer

Irobot discovery

It sounds like the battery is shot. These batteries only work for a couple of years and then they won't accept a charge any more. A common mistake people make is recharging them before they need it. This will make the battery "lazy"
Contact the manufacturer for more info.

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