Review on 🔋 TATTU 4500mAh XLife Extended Life Replacement Battery for iRobot Roomba R3 Series Models - Compatible with 500, 600, 700, 800, and 900 Series Models (530, 531, 532, 535, 536, 540, 550, 552, 560, 562, 570, 580, 595, 620, 630, 650, 660, 760, 770, 780, 790, 870, 880, and 980) by John Snook

Supplied without standard fuse. I have reviewed and tested many brands including the official iRobot Roomba batteries and I have found this to be the only Roomba battery made without a fuse. As you probably know, batteries of this size can be a real fire hazard in your home. . So I can't imagine any manufacturer saving $0.04 on this part. In the event of an anticipated catastrophic battery failure, the fuse will force the Roomba to shut down and prevent a real disaster for your home, but it won't protect you if the manufacturer pulls it out of the battery design. In my testing, this battery lasted 205 cycles installed in various iRobot Roomba models. For the first few cycles I noticed this battery getting hotter than it should, but it worked for normal times to complete cleaning cycles as expected. However, if the battery wears out, it will trigger when Roomba detects secondary overheating and end the cleaning cycle. Overheating of Roomba's batteries is not common. So, the backup aside, this battery stands out from others I've tested as the only one that ended up getting too hot for Roomba to finish its cleaning sessions. When I disassembled the battery, I found that all of the internal cells were operating within normal voltage and capacity thresholds. Therefore, element failure was not the cause of the excessive heat. Just guessing now. Based on the unusual overheating behavior of this battery with no cell failures, I suspect the manufacturer is using cells that are not rated for the current draw. I can't help but wonder if the manufacturer is aware that the cells used in this battery aren't up to the task. Did they throw away the fuse because otherwise there would be problems with the fuse blowing due to the excessive heat generated by that battery? PLEASE READ this manufacturer's apparent disregard for your safety. Think carefully before trusting any of these batteries in your robot.