Review on 🔋 Firstpower 5.0Ah 14.4V Roomba Battery Replacement R3 Compatible with 500 600 700 800 900 Series 510 530 531 532 535 536 540 550 552 560 570 580 595 620 650 660 760 770 780 790 800 870 by Josh Heelis

This battery barely lasts 40 minutes on my Roomba. The previous 3-year-old battery lasted about an hour until a cell suddenly failed. When the previous battery was new it was rated at 3.5Ah and lasted about 2 hours. I recommend looking elsewhere. UPDATE: The seller sent me a different battery. It seemed to work a little better, but not by much, so I decided to switch to explore mode. I have a couple of battery chargers and decided to test the batteries that came in the original packaging. The smallest battery in the original packaging had a capacity of 2034 mAh, the maximum was 2168 mAh. I only tested one battery in the replacement kit and it was 2084mAh so it's the same. That explains the short runtime. As I originally said, these batteries are not 5Ah. I honestly didn't expect them to be 5Ah batteries. I'd love for them to hit somewhere over 3000mAh, but they're lacking even that. SO many battery suppliers exaggerate or outright lie about the capacity of their batteries that it is very difficult to trust capacity claims. Having looked at the capacities available for the battery sizes used in Roomba battery packs, I also don't believe any of the battery pack vendors who claim anything over 4000mAh. I would be quite shocked if any of them reached such a high level. Individual cells of this capacity are too expensive to produce a Roomba kit at a price close to what they are sold for. The fact that the seller is willing to send me another block, and that block is the same size as the original, leads me to believe that he might be scammed by his supplier, but that doesn't change the fact that these Blocks of low-battery packs.