Question about Roomba Robotic Floor Bagless Vacuum

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Battery charge I just purchased a new battery pack insert for my Roomba, Replacement was a breeze and it now works great. My question is; The last battery I bought ( not from you) was a full cased roomba battery pack that didn't last a year. Roomba says leave the r Roomba charging all the time so it's ready when you need it, and that's nice but I feel that leaving it charging like that it will kill the battery faster as it is always warm to the touch. These battery's should last at least 5 years as I have been told, but I have never seen that and I blame it on a constant charging state. My theory is and correct me if I 'm wrong, is to keep the battery out of the charger until I need it and charge it the day before, after I'm done then give it a full charge and then unplug it. I really need this pack to last longer then a the last 2 and I feel that the constant charging is not helping. Is the right way to go? dle53@bellsouth.net Thanks Dave

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Dave you are correct. You should never over-charge anything like a Roomba, Cel Phone, etc. That will kill a bettery very quickly.

Posted on Jan 11, 2009

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Red light flashing very fast and not charging fully


How long is it charging until the light goes from flashing red (no charge) to yellow to finally green (full charge) ? If it's not at least 2 hours, sorry I don't have my Roomba papers available, so I'm guesstimating here, it's not getting a full charge. If you can put a voltmeter on the " fully charged" battery pack, that might tell you if the charger is the problem. Clean off the metal contacts where Roomba meets the two metal contacts on the charger. Also just because a battery pack or set is new doesn't mean it's functional. I had a new Apple battery for my laptop that didn't work when I replaced an older one.

Sep 26, 2014 | iRobot Roomba 530 Robotic Vacuum

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My Roomba Model 440 runs for about 2 minutes and stops. I can start it up again after which it repeats stopping after not quite 2 minutes. It is perfectly clean and charged. What is the problem?


Most likely your NiCad battery is at the end of it's life and needs replacement. The packs in Roombas are made up of a group of individual cells and what often happens as they age is that a single cell will fail, causing the entire pack to provide less than usable voltage. The Roomba will attempt to operate and then sensing low voltage, it will shut down.

To prevent reduced battery life in the future with your new pack, always keep your Roomba charged as storing a NiCad pack in a discharged state will cause the build up of salts within the pack, damaging the cells.

Replacement is simple and packs are around $40 bucks online, all you need is a small Phillips screwdriver and about 5 minutes.

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If you're sure the battery contacts are clean and the battery really is charged, then there is faulty circuitry within the Roomba that would have to be repaired or replaced.

Confirm that the battery is inserted with the metal contacts down so they make contact with the spring terminals in the battery compartment.

Visually confirm that the metal contact plates on the battery pack, and the spring terminals in the battery compartment are clean and shiny. If not, wipe with a clean cloth or paper towel, its OK to use a little water or rubbing alcohol on the cloth, if needed, and then dry it.

Visually confirm that the metal contact plates on the Roomba, and the spring terminals on the docking station's home plate are clean and shiny. If not, wipe with a clean cloth or paper towel, its OK to use a little water or rubbing alcohol on the cloth, if needed, and then dry it.

If you have a volmeter, measure the voltage between the contacts on the battery pack If it isn't something in the neighborhood of 14 volts and is 11 volts or less, the battery isn't fully charged.

Reinstall the battery.

For the moment, please connect the power adapter directly to the Roomba rather than the docking station to eliminate one possible faultly connection.

If the battery wasn't fully charged, or you weren't able to test it, try to charge the Roomba and then retest the battery voltage if you can. If the battery voltage was higher immediately after charging, but didn't get to 14 volts, the charger is good, but battery needs to be replaced. If the battery voltage was unchanged after attempting to charge the Roomba, the charging circuitry may be faulty. If there was no light patterns when you tried to charge it, and it was plugged in to a good outlet, then the power adapter or charging circuitry is definitely bad.

If you have no voltmeter and you cleaned the contacts and tried to charge the Roomba and it works, use the Roomba and then recharge using the docking station and see if it was just dirty contacts or it won't charge through the docking station. If it didn't work, you'll need to figure out if its the battery, the charging circuitry in the Roomba, or the power adapter. If there are no lights when you try to charge the Roomba, then Either the power adapter or the Roomba power circuitry is defective, but without a voltmeter you can't find out which one, and there's no way to know if the battery is good or bad, but you know Roomba wasn't trying to charge it. If there are lights when you try to charge the Roomba, then at least you know the power adapter is good. Unfortunately, without being able to test something there's no way to distinguish between a charger that won't deliver a charge to the battery and a battery that won't accept a charge. If you want to take a guess then a bad battery is more common and less expensive to fix.

Jul 07, 2012 | iRobot Roomba 560 Robotic Vacuum

1 Answer

I have a Roomba, it runs for a few minutes and stops, the battery is fully charged. Any ideas?


The battery isn't able to fully charge, it just retains the proper voltage, but lacks the amperage to run because the first and last battery in the pack are dead. Battery replacement time. Try Ebay for best battery pricing.
BTW I use the nicad pack.

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1 Answer

Our roomba 560 wont charge have replaced the battery Tested the charing unit with another roomba that all seems ok put the uncharged battery into another Roomba but im guessing it now has a memory as this...


Try cleaning the battery contacts with a little rubbing alcohol or contact cleaner on a foam swab, or a bit of paper towel. Take a litle time, it doesn't always dissolve instantly. (Don't use a pink pencil eraser, it would scrub off the plating that prevents corrosion) Clean both contacts on the battery pack and both of the contacts in the Roomba. Make sure the battery is oriented correctly when you put it back in. Also clean the charging base contacts and the corresponding contacts on the Roomba itself.
I'm not sure entirely sure what you're trying to recover - the new battery pack, the old battery pack, or the Roomba itself - but since you can swap parts back and forth, you can clearly isolate the problem. The old battery pack might be rehabilitatted if you have the equipment to recondition it, but if it may not work. The new battery shouldn't have been harmed that easily.

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1 Answer

I have the irobot roomba and the battery does not hardly hold a charge and now it won't go forward just backwards and around


The Roomba has a rechargable Battery. The Roomba battery like any battery will eventually ware out after so many charges and discharges. Mine lasted about three years and then is would hardly hold a charge. I purchased a new battery and then it worked fine after that.

As for not going forward. That is usually due to a dirty bumper sensor. You have to take the Roomba apart for cleaning that. You can take it to Sears and they will do it for you.

Oct 01, 2009 | iRobot Roomba Discovery SE Bagless Robotic...

2 Answers

Model4210battry won't recharge, is it worth ordering a battery?


don't buy a new battery yet. you can reset the battery by charging for 16 hours, if this does not work, you need to take the battery out, push and hold the power button on your roomba for at least 15 seconds then reinstall the battery. plug in the charger directly to roomba not the docking station and charge until the battery light on the roomba is green. do not interrupt the battery charging cycle. after, leave the roomba charging for an additional 3 days or 72 hours. after, run roomba in max mode and run it till the battery is completely depleted. this will improve the battery overtime by charging again for 72 hours and depleting the battery. do this 3 or 4 times. and the battery should get better

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1 Answer

My Roomba Discovery doesn't appear to hold a charge


cor2an,
That sounds like a classic battery failure in the Roomba discovery series. There are sensors inside the battery pack that go bad too. Either way...it's not very practical to repair the battery....the best shot you have would be to order a replacement battery. You just pop the old one out and then put the new one in.

They are available from iRobot for $69 at this link: http://store.irobot.com/product/index.jsp?productId=2799714&cp=2804606.3358509&ab=CMS_AccSuper_Roomba400_102308&parentPage=family

There are sources of less expensive (about $35) Genuine iRobot quality batteries also. You could try www.RoboticVacParts.com at this link: http://cgi.ebay.com/OEM-iRobot-APS-battery-Roomba-400-4XXX-Discovery_W0QQitemZ270412120603QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item3ef5d1821b&_trksid=p4634.c0.m14.l1262&_trkparms=|301%3A1|293%3A1|294%3A30

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3 Answers

Battery temperature sensor.


you should not make your own battery and use it with roomba, or try charging it with a charger not meant for roomba, i suggest you buy the APS battery on ebay for $30 - $40. and buy a new charger from the company for $30. You can do some serious damage to the motherboard on the robot and your roomba might not work at all after that.

Mar 10, 2009 | Roomba Robotic Floor Bagless Vacuum

1 Answer

Roomba 4200 Scheduler


The best for the battery if (NiMH). Discharge completly, than charge full (charge more even the charger indicates full charge)

Clean every part, maybe a hair slow down the wheels and thats why need more power.

Here some tip from the web:


With proper care, one iRobot Roomba battery can last for hundreds of cleaning cycles before you need to replace it. Here are some things you can do to extend Roomba's battery life and keep Roomba cleaning at peak performance:



Use your Roomba frequently. Your Roomba is powered by a rechargeable nickel metal hydride (NiMH) battery, which lasts the longest when you use it regularly.



Keep the brushes clean. If the brushes and brush axles get clogged with hair and other debris, your Roomba will strain to spin them, using more battery power than normal. In extreme cases, the battery can even be damaged. See How to remove and clean Roomba's brushes



Keep your Roomba plugged in when not in use. If you have a Home Base®, keep your Roomba docked in the Home Base and plugged into the charging brick. If you don’t have a Home Base, keep your Roomba plugged into the APS Fast Charger.



Make sure you are charging your Roomba correctly. When your Roomba is plugged in correctly, the solid green light should be illuminated on the charger or on the Home Base.



Plug your Roomba in as soon as possible after using Max Mode. Leaving your Roomba unplugged for more than 24 hours can damage the battery.



Place your Roomba and the Home Base on a smooth, hard surface when yourRoomba is plugged in. Make sure your Roomba and the Home Base have plenty of space for ventilation. Do not charge your Roomba on a carpet or rug.



Charge and store your Roomba in a cool, dry place. Keep your Roomba out of direct sunlight and away from sources of heat such as windows, radiators, heating vents, and large appliances.



Remove the battery when not using your Roomba for a long period of time. If you will not be using your Roomba for more than a few weeks, fully charge the battery, remove it, and store it in a cool, dry place. When you want to use your Roomba again, insert the battery and fully charge it. Leaving your Roomba plugged in for weeks when it is not being used can damage the battery.

You can purchase a second battery or replacement online at the iRobot Store.

Nov 11, 2007 | iRobot Roomba 4210 Bagless Robotic Vacuum

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