Roomba 880 vs 960 Run Time

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Roomba 880 vs 960 Run Time

Postby marquesalan » December 17th, 2016, 9:51 am

So I currently own an 880 and I get about 2 hours of run time in my home. Only the master bedroom has carpeting. The rest of the house is hard wood floors with lots of area rugs and tile. I want to upgrade to the 960 because the 880 series seems to have technical issues iRobot is currently working on. Can someone with a 960 let me know what kind of run times they are getting? It seems a bit odd that the same motor in both units do not run the same or even better with their new battery system. Maybe the new navigation system and camera eat up a lot of juice or maybe it cleans better in a shorter amount of time.
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Re: Roomba 880 vs 960 Run Time

Postby piokrza » December 17th, 2016, 6:38 pm

960 has the same gen II motor bin as 880 but uses less capactity battery pack thus shorter estimated runtime 75 minutes
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Re: Roomba 880 vs 960 Run Time

Postby marquesalan » December 18th, 2016, 3:36 pm

It must be a lesser capacity than the X-life blue battery because that one lasts. Maybe I will try using the blue battery in the 960 and see if it's better. Do you know how long the 880 is rated to run? I get two hours but the people at iRobot said that was unusual. Maybe I will get that out of the 960. Seems so dumb to make a vacuum with a shorter run time than previous generations. It makes the robot look bad.
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Re: Roomba 880 vs 960 Run Time

Postby piokrza » December 18th, 2016, 6:41 pm

Yes, it's probably 2100-2200mAh battery. 980 uses 3100-3200mAh Li-ion battery, so even larger than xLife 3000mAh NiMh battery. Also, newest 605/606/615/616 models uses 2200mAh NiMh battery. x-Life doubles lifetime of battery (up to 900 cycles), but not cleaning time on single charge. It's the same as old 3000mAh NiMh APS yellow battery. Should be above 2hr on mixed hardfloor/area rug but on hard floor alone can be even longer. In "Dock" mode, dock-off run time is prolonged even further. 960/980 has different cleaning pattern (systematic), so it does not need to work so long to clean/cover similar area. It's faster.
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Re: Roomba 880 vs 960 Run Time

Postby babakonda » December 18th, 2016, 8:46 pm

marquesalan wrote: the 880 series seems to have technical issues iRobot is currently working on.

...could you elaborate this in more detail, please? Which technical issues? Thanks in advance.

My 880 has a bit over 2hrs runtime in my house as well, mostly hardwood floors (if I remove the dock, that is). Blue nimh x-life battery, 1.5 years old
iRobot customer support commented that my battery is in good condition (actually congratulated me, lol), it didn't seem weird or unusual to them.
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Re: Roomba 880 vs 960 Run Time

Postby gregj » December 19th, 2016, 5:22 am

960 is bit more efficient, because the robot is no longer bouncing around randomly like the previous generations. So despite having less battery capacity it might be quicker at hoovering. I know it has been for me. And, as an added bonus - it will go back to the base to recharge before resuming - so - what are you waiting for ? 880 is so outdated nowadays !
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Re: Roomba 880 vs 960 Run Time

Postby marquesalan » December 19th, 2016, 9:14 am

I am waiting for the 960 unit to go on sale around Mother's Day it's 15% off so it will be the same price as my 880 I have now. I can get $600 for my 880 so it's usually an even exchange. I haven't paid for more than one Roomba however I have owned about 6 over 10 years.
As far as the issues with the 880. iRobot tried to fix it with me. My lighthouses turn on for about 20 seconds randomly then turn off whether the Roomba is working, docked or charging so it was draining the batteries after about a month. I just stopped using the lighthouses. It also squeaks and makes a weird squealing noise when it first start up. Both new units have done the same thing after about 2 months of use. We do not have a dirty home and I keep the unit very clean. They can't figure it out.
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Re: Roomba 880 vs 960 Run Time

Postby marquesalan » December 19th, 2016, 9:29 am

piokrza wrote:Yes, it's probably 2100-2200mAh battery. 980 uses 3100-3200mAh Li-ion battery, so even larger than xLife 3000mAh NiMh battery. Also, newest 605/606/615/616 models uses 2200mAh NiMh battery. x-Life doubles lifetime of battery (up to 900 cycles), but not cleaning time on single charge. It's the same as old 3000mAh NiMh APS yellow battery. Should be above 2hr on mixed hardfloor/area rug but on hard floor alone can be even longer. In "Dock" mode, dock-off run time is prolonged even further. 960/980 has different cleaning pattern (systematic), so it does not need to work so long to clean/cover similar area. It's faster.


Doesn't it seem crazy they would put a smaller battery in the latest series generation? Makes no sense my 880 would run longer than a brand new 960. I guess I will keep my old X-life battery and use it in the 960 and see the difference. I am going to keep both units for a while and decide which one I like the best. Ideally I the 980 would be the way to go but it has an ugly finish and expensive.
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Re: Roomba 880 vs 960 Run Time

Postby babakonda » December 19th, 2016, 10:33 am

marquesalan wrote:As far as the issues with the 880. iRobot tried to fix it with me. My lighthouses turn on for about 20 seconds randomly then turn off whether the Roomba is working, docked or charging so it was draining the batteries after about a month. I just stopped using the lighthouses. It also squeaks and makes a weird squealing noise when it first start up. Both new units have done the same thing after about 2 months of use. We do not have a dirty home and I keep the unit very clean. They can't figure it out.

None of those issues happen with my 880 :think: manufactured in 2014, I purchased it used from the UK a year ago.
It runs daily, I have 5 lighthouses (all of those in virtual wall mode, not lighthouse mode as I don't need it), battery life in those is around 4 months (I buy cheapest alkaline batteries though). All hardwood floors and occasionally it cleans a shaggy rug too, rather clean house with lots of pet hair (two cats).
I empty the bin & clean filter daily; clean the rollers/sidebrush/caster wheel weekly; remove bottom cover monthly.
Squeaking did happen occasionally but that was due to some micro debris in front castor wheel, and it stopped after I cleaned it with air.
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Re: Roomba 880 vs 960 Run Time

Postby marquesalan » December 19th, 2016, 12:51 pm

You are lucky yours is behaving. This is the worse model I have own as far as reliability goes. I have 5 lighthouses as well but I use them all in lighthouse mode so the unit could travel from room to room. I don't support using regular batteries any more due to the impact on the environment. The recyclables work just as well. I am happy with performance of the unit but the constant squeaking is annoying. Now I run it when I am not home and have tried to limit my lighthouse use. I could try a third unit and see if it's the lucky charm!
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Re: Roomba 880 vs 960 Run Time

Postby babakonda » December 19th, 2016, 12:56 pm

marquesalan wrote:I am happy with performance of the unit but the constant squeaking is annoying.

Were you able to determine the exact culprit for that squeaking noise?

BTW, isn't there a limit of max number of lighthouses 880 can use? I vaguely remember I read it somewhere...up to four? Correct me if I'm wrong.
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Re: Roomba 880 vs 960 Run Time

Postby piokrza » December 19th, 2016, 1:44 pm

Imho I would wait for next gen Roomba rather than getting 9xx which bringed nothing new than systematic cleaning pattern, but the same cleaning mechanism and cleaning (in)efficiency on area rug as 8xx. I have 870 and it doesn't clean rugs as good as 620&780 did. Simply, it lacks stiff bristles so it can't pick up fluffs from clothes stick to the rug.
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Re: Roomba 880 vs 960 Run Time

Postby vic7767 » December 19th, 2016, 5:39 pm

babakonda wrote:isn't there a limit of max number of lighthouses
All Roombas that are Lighthouse capable can use up to a maximum of 16. That is the memory register capacity in the Roomba hardware. In reality there is not enough battery capacity to allow 25 minutes x 16 Lighthouses amount of runtime.
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Re: Roomba 880 vs 960 Run Time

Postby piokrza » December 19th, 2016, 6:58 pm

marquesalan wrote:Doesn't it seem crazy they would put a smaller battery in the latest series generation? Makes no sense my 880 would run longer than a brand new 960.


It's cheaper than 980 so they had to cut-off some features, incl. battery capacity.
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Re: Roomba 880 vs 960 Run Time

Postby babakonda » December 19th, 2016, 8:56 pm

vic7767 wrote:
babakonda wrote:isn't there a limit of max number of lighthouses
All Roombas that are Lighthouse capable can use up to a maximum of 16. That is the memory register capacity in the Roomba hardware. In reality there is not enough battery capacity to allow 25 minutes x 16 Lighthouses amount of runtime.

Thanks for this info, very interesting! :cheers:
Sorry for the offtopic, but I wonder why they chose 16...
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Re: Roomba 880 vs 960 Run Time

Postby vic7767 » December 19th, 2016, 10:30 pm

I spoke from memory and made a small miscalculation on the number of Virtual wall/Lighthouse accessories that the Roomba can count and assign IDs to. There are 4 bit positions that can be set to assign values of 1 to 10. Values 11 through 15 are reserved for future use. So, you can only have a maximum of 10 LH/VWs which is still way to many for any available battery packs on the market today.
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Re: Roomba 880 vs 960 Run Time

Postby marquesalan » March 23rd, 2017, 12:42 pm

So my 880 still squeaks but I am getting ready to upgrade around Mother's Day. The iRobot website at that time stated the 880 was good for 60 minutes which I have far exceeded. The 960 says it's only good for 75 minutes but at least it recharges and resumes. Can a current 960 owner please post what run times they have experienced in a house that is mostly hard floors? I am guessing that since it's more systematic, the 960 might clean the house faster than the 880's random bouncing around pattern.
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Re: Roomba 880 vs 960 Run Time

Postby vic7767 » March 23rd, 2017, 3:09 pm

The 960 uses a 2100 mAH Lithium pack. Your 880 may have a 3500 mAH NiMH pack. Run times will be different due to battery capacities. I removed the 960 2100 mAH pack and upgraded to a 4400 mAH Lithium pack. Run times increased to over an hour but this 960 cleans on mostly carpeted flooring and finishes a full mission in 2 charging cycles (3 runs).
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Re: Roomba 880 vs 960 Run Time

Postby marquesalan » March 24th, 2017, 5:22 pm

It usually runs over an hour with the original batter in the 960. I don't see where the increased mAH helped at all.
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Re: Roomba 880 vs 960 Run Time

Postby bilafero » March 29th, 2017, 10:56 am

although the 880 is more handy... but... still it cannot beat 960
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