14.4V 6.0Ah Battery Replacement for iRobot Roomba Battery, Compatible with iRobot Roomba 500 600 700 800 Series 880 890 861 864 866 770 675 650 655 680 671 640 780 790 760 595 585 560 550

It IS relevant to note that this battery works in my old 780 for she is a sensitive old beast. After probably thousands of miles of vacuuming (at this point), she is rather picky about the batteries she responds to. She flat refuses to work with some of the knockoff brand batteries while my other 780 Roombas don't seem to care about brand. The last battery I had was down to keeping her only working a room for half an hour before needing to dock. This new battery keeps her going for a couple of hours at least. She finishes the room and docks and still has the green light when she docks. No complaints there.I can't speak to how long this battery will last as of yet (years? months?). Any knockoff brands I have gotten need to be replaced almost yearly while shelling out the dollars for the irobot name brand battery means replacing about every 3 years. They also cost about 3 times as much so...it all comes out about equal in the end. Personally, I prefer to shell out fewer dollars at a time on the off chance I find a brand that lasts longer than expected.Anyway, no complaints, works well, very helpful for my old Roomba.

Battery contains 2.0Ah cells in a 4S2P configuration for a total capacity of 4.0Ah - NOT 6.0 Ah as advertised. Blatant false advertising as they are claiming 50% more capacity than the product actually provides.Other than using lower capacity cells than advertised (and probably low quality ones as well), the overall construction is fine and the battery works. You're just not getting what you paid for.Avoid this product unless you want to get ripped off!

This review is for "14.4V 6.0Ah Battery Replacement for iRobot Roomba Battery, Compatible with iRobot Roomba 500 600 700 800 Series 880 890 861 864 866 770 675 650 655 680 671 640 780 790 760 595 585 560 550", Supowill item number R314450 (ASIN B0CQC2FBDY). Title and ASIN are included in the review because sometimes reviews get re-sorted and are no longer associated with the correct product.The Supowill iRobot 14.4v 6.0Ah battery shipped quickly and was packaged quite well in a cardboard box. Inside the shipping box the Supowill battery arrived retail packaged in a fitted cardboard box, and some crumpled paper had been inserted to reduce transit damage. Within the retail box was the Supowill battey and a fairly generic looking "Power Tool Battery User Manual" in English and what looks like German. The battery itself is labeled "R314450", "Rechargeable Lithium Battery", "14.4v 6.0Ah 86.4Wh", it has a warning, several usage/recycling icons, and several certifications. I didn't notice until I was writing this review, but in several photos the Amazon listing shows the battery labeled "14.4v 4.0Ah 57.6Wh".I purchased the Supowill battery to replace the aging battery in my Roomba 655. I had purchased another brand's replacement battery about eight months prior, but testing of this battery showed that the capacity had been grossly exaggerated (see https://www.amazon.com/gp/customer-reviews/R27PHCYV49YWT7?ref=pf_ov_at_pdctrvw_srp) so I chose not to use it. I'm somewhat excited about this battery as it contains Li-Ion cells, which contain a higher energy density than the older technology NiMH cells which are in the OEM battery.I do have a concern that the Roomba may have trouble making it back to its dock with a Li-Ion battery. Why? Li-Ion batteries tend to hold their voltage higher during use than NiMH, then the voltage drops off much more rapidly than NiMH as the cells near depletion. I don't know how the Roomba decides when it's time to return to base. If that decision is based on voltage level (rather than a timer) then with a Li-Ion battery the Roomba may make the decision to return to base too late, when there's not enough energy left in the battery to make the return journey. I'll be certain to check on this.Before installing the Supowill battery in my Roomba 655 I performed capacity testing on the battery. This battery is advertised as 14.4v and 6.0Ah. I opened the battery to determine the internal battery configuration and found the Supowill to contain eight 18650 Li-Ion cells in a 4S2P configuration, much like the exploded battery photo in the Amazon listing. The 18650 cells are labeled "3.7V", then have a barcode, then are labeled "INR18650P 20 KECHF20F1U76A". For those who are curious, I scanned the barcode and it's "ECHF20F5W9GU". I'm very concerned that the "20" (and possibly the "20F") in the cell labeling indicate a 2000mAh cell, because 2000mAh cells would mean a 4.0Ah battery and not a 6.0Ah battery as advertised. 18650 Li-Ion cells typically have a nominal voltage of 3.6v-3.7v and the cells in this pack are labeled 3.7v, hence (3.7v)(4)= 14.8v, which is actually a bit higher than advertised. If the cells are rated 3.0Ah each, then the energy capacity of this pack would be (14.8v)(6.0Ah) = 88.8Wh. The battery is labeled 86.4Wh, which would be correct for cells with a nominal voltage of 3.6v and 3000mAh.SUMMARYCareful capacity testing shows that the Supowill Roomba battery delivers 4.0Ah of energy, not 6.0Ah as advertised. The 4.0Ah as tested matches the labeling on the internal cells as well as all of the photos in the Amazon listing, which show the battery labeled "4.0Ah" and "57.6Wh". This simply isn't a 6Ah battery, it's a 4Ah battery. However, at 4.0Ah it's still more capacity than the original OEM battery and it operates my Roomba 655 just fine.The Long NarrativeBefore using any rechargeable battery, I perform a series of capacity tests using my computerized battery analyzer (CBA). I like to confirm that a battery has the advertised capacity as claimed. Supowill claims that the battery is 14.4v and 6.0Ah. I typically test batteries by fully cycling them until two consecutive capacity tests indicate the same capacity to within 3%. I choose a discharge rate of 1C (or a max rate which does not exceed my tester's limit of 100W) and I configure the test to stop on Li-Ion batteries when the cells have been discharged down to 2.8v (i.e., 11.2v for a 4-cell battery pack). I have performed capacity tests on literally thousands of batteries (NiCD, NiMH, Li-Ion, LiFePO4, SLA) and my expectation is that a new Li-Ion battery should be able to deliver 95%-98% of its rated capacity.Why do I perform this sort of testing? It has been widely reported that non-OEM battery manufacturers exaggerate the capacity of the batteries that they sell. I've personally encountered this several times, even with another Supowill battery which claimed to be 6Ah but was actually 4Ah (see https://www.amazon.com/gp/customer-reviews/RPLT4HQGRPXHY/ref=cm_cr_getr_d_rvw_ttl?ie=UTF8&ASIN=B0CQ1KCLNB).I tested my old, used OEM Roomba iRobot XLife Extended Life Battery eight months ago. The OEM battery is rated 14.4v and 3.0Ah or (14.4v)(3.1Ah)= 43wh. I configured my tester to draw a gentle 0.5C rate (1.5Ah) and the result came in at 2.195Ah/31.956Wh or about 73.2% of the rated 3.0Ah capacity. That's not so bad for an old, used battery. The new Supowill battery should test at nearly three times this capacity (6.0Ah/2.195Ah = 2.73 times more capacity).To be fair, I decided to test the Supowill battery at the same discharge rate as the old OEM Roomba battery, or 1.5A. For the Supowill which is rated 6.0Ah this rate would be an extra-gentle 0.25C, and the test should take about four hours (240 mins) to complete. (Note: If the cells are actually 2000mAh as suspected then the test will take more like 4Ah/1.5A= 2.66h or 160 minutes.) The first test lasted 156 minutes and the measured capacity was 3.894Ah. That's 56.413Wh or about 64.9% of the rated 6.0Ah capacity. That's an absolutely awful result. But if the rated capacity had been 4.0Ah then that result would be 97.35% of rated capacity, comfortably within the expected 95%-98% range. I recharged the Supowill using my trusty Turnigy Accucell 8150 charger (configured for a 1.5A charge rate) and measured 3,884mAh delivered to the pack.The second result came in at 3.849Ah/55.789Wh or 64.2% of the ridiculous 6.0Ah rated capacity. That's two consecutive results within 3% of one another, so I'll stop here. Clearly, this is no 6.0Ah battery. It's a 4.0Ah battery. As stated earlier, my expectation is that a new Li-Ion battery should be able to deliver 95%-98% of its rated capacity. If the battery had been rated 4.0Ah, then the second results would have been 96.23% of rated capacity -- within the expected 95%-98% range.I've posted an image of the discharge graphs for these tests and the test of the OEM battery which I performed eight months ago. The OEM battery is the shorter line, ending at 2.195Ah. The two longer lines are the Supowill, ending just short of 4.0Ah (not 6.0Ah). Sure, the Supowill battery has more energy that the OEM battery, but it's clearly a 4.0Ah battery and therefore it delivers only 2/3 of the advertised 6.0Ah. If Supowill had claimed 4.0Ah rather than 6.0Ah I'd have concluded that the battery met their claim. But Supowill claims 6.0Ah capacity, which is absolutely false.I installed the Supowill battery into my Roomba 655 and it fit nicely. I ran the Roomba on the Supowill battery and it operated just fine. I left the house with the Roomba running and the Roomba returned to its base before I returned. It occurred to me that I should probably clock how long the Roomba runs with the Supowill battery, and possibly compare that runtime against the runtime with the OEM battery. On the next run, I noticed that after an hour the Roomba hadn't returned to base yet so I went looking for it. Apparently, a bathroom door had been left open and the Roomba went in and closed the door on itself. It was still running, so I just opened the door. The Roomba came out and quickly returned to the dock after 101 minutes. The next day I closed the bathroom door before I sent the Roomba on its way, and it returned to the dock after 77 minutes. I looked up the specifications for the Roomba 655 and the maximum runtime was listed as 60 minutes, so the Supowill does appear to offer extended runtime.Overall, I'd say that even though Supowill exaggerates the capacity of their battery, it's a bargain at $29. At this price point it's cheaper and packs more capacity than an OEM replacement battery. I'll use the Supowill as it has more capacity than my old battery, but I'm deducting two stars for the ridiculous exaggerated capacity claim.

I read the description wrong and so the battery won't fit my roomba. I should have torn my roomba apart, which is only removing a few screws, before ordering to be certain of what I needed. Having said that, it was well packaged and shipped quickly. It is exactly as pictured and if you've read the description better than I did you should have a battery that works great. Only giving 4 stars because I cant accurately review what I cant use. Absolutely not the fault of the seller.

This battery fits my Roomba 761, and the installation was easy. I will need more time to evaluate the longevity of this battery. But I am pleased this far.

This worked perfectly to replace the old battery in my Roomba. It last much longer than the old battery did. Would recommend if you need a replacement battery!

Extremely simple battery replacement, drop it in and your good to go. Voltage/power seems good, no issues vacuuming and roaming around. Capacity/runtime is also great. No issues charging.