5300mAh Extended Life Lithium Ion Battery Compatible with iRobot Roomba 500 600 700 800 Series 880 770 650 655 870 760 780 790 645 595 585 561 560 550 531 861 864 866 775 780

Works better than original but with interesting side effect
So for my IRobot 675E my original battery (2.5 months old) was only giving us a little over an hour of run time. Very disappointing. Originally it was going around 2 hours (+/- 15 minutes) but we were having to manually set on dock more times than not getting near the 3 month mark due to power failure. Purchased this battery to see if it would improve run time any and the answer was YES. But we found something interesting……I installed this battery (super easy) and let charge on docking station overnight. The next morning, I fired it up and let it begin its work, but not before i unplugged the home base so that it would not be recalled and I could see just how long this battery would operate. Well, after 4 hours and 15 minutes it finally died in our hallway. Very good battery charge! What was interesting was that the self docking signal still came on at 1 hour 40 minutes, just like it did with our original battery. The low battery warning light was on as well and stayed lit for over 2 hours. Apparently the return to home base function and battery capacity indicator is software/time based and not reliant on the actual battery charge capacity. Interestingly enough, on day 2 of operation with this new battery, the Roomba unit stopped twice during operation, usually about 1 hour 50 minutes or so duration each time, and stated job complete. I started up again and away it went. Curious how the first day went over 4 hours and the second it was shutting down on its own, almost like software was being altered even though we showed no updates applied to the OS. Day 3 of operation (today), we are currently at 2 hours run time. The docking light is flashing and the low battery warning light is currently on but my unit just keeps going. I have since cleaned out the debris compartment and swapped filters once. It has not quit working yet, so curious to find out if it will go the entire 4 hours again or if it will stop, stating job complete and requiring manual restart.In conclusion, this battery seems to be well worth the investment. Longevity will determine any future amendments to this review. Downside is, due to apparent software installed in the Roomba, to get longer run times you would need to unplug the home base unit and plug back in after the fact. Small sacrifice though for getting extended run time for cleaning the floors.

Battery Dies after 6 months
After about 6 months of good use and enjoying my roomba, the roomba would display a dead battery indicator, and constantly boot cycle when I would reposition it on the charger.I removed the battery, and decided to test the voltage. Any sane person designing a lithium battery pack will contain an electronic “brain” that manages the charge level of the batteries within. These electronics make sure that the batteries are well-maintained, so that your roomba doesn’t spontaneously combust as it cleans up the cheerios your nephew tosses under your coffee table .Basically, if the charger tries to charge too much, the Battery Management System (BMS) will turn off and be like “nope, they full” and diconnect. If the Roomba is getting close to empty charge, it disconnect and say “batteries getting too low” in order to prevent damage to the batteries’ sensitive inside bits.So when I went to test the voltage, I got 2.5mV volts on the battery terminals. Ensuring I wasn’t insane, I use a different multimeter and still got 2.5mV, verifying my meter on my nearby drone battery which read a happy 4.09V.What this could mean, since I cannot take the pack apart (without hoping to get a replacement), are a few things:1) The BMS circuitry malfunctioned and something in the electronics died. Normally, this is rare, because in my experience the next point is FAR MORE common.2) There are 8 individual 18650 cells inside this pack. 4 in series, 4 in parallel. The BMS will (presumably) normally balance these cells so that they each have the same voltage (cells are never identical in their characteristics, so you want them all on the ‘same page’, so to speak). If one of these cells goes bad (aka internally shorts), then that cell will have a super low voltage and sort of tank the entire pack.For example, let’s focus on the 4 cell in series case. If you have 4 cells in series (you add the voltages), they should normally be 3.6V * 4 = 14.4V if we are dealing with a nominal charge. But now, say one cell dies and can only maintain 0.5 V for various chemistry reasons. So now we have a pack that has 3.6 + 3.6 +3.6 +0.5 = 11.3V. Now remember how the BMS disconnects if the battery get too low? Well generally 18650 batteries should not go below 3.0v, so let’s assume this is the minimum safe charge. This level will be 3.0*4=12V. So even if one cell goes bad, then the BMS, if simply designed (which let’s be honest, they probably are not too complicated given the price), then the BMS will never charge and simply display a disconnect, as it does in my case.Honestly, subpar lithium cells are the anathema of modern devices. Given the price, these cells are probably low quality, or do not go through enough quality control in order to root out the “Early Infant Mortality” cases of the bathtub curve.Anyways, took a gamble, and I lost. Most likely subpar lithium cells. For $40, ehhhh, would probably not do it again. If you like gambling and the casino is too far of a drive, try this battery pack.If you win you get clean floors.

So far, so good
What’s there to say about a battery? **This** battery seems to be doing a good job. The Roomba functions well three times a week, the battery charges properly, and I am happy with this product. It was easy to install.

Fonctionne très bien

Works great