As well, my needs will continually change, and instead of buying UPS units for each item of technology, I'd rather have one that gives me the flexibility to change the technology I'm using without limiting myself because a particular piece of new technology isn't compatible with the backup solution I have. If necessary, I can plug other devices into it (with the understanding they would eat into that 10-hour window), Technology keeps changing, and I'd hate to invest a significant amount of money into a battery or power supply specific to a router that may end up getting changed in a few years. Yeah, a bit of overkill since I'm in an area that's low risk for PSPS, but one never knows when there may be some other event that causes an extended shutoff. According to the unit's display, I'm good for 10+ hours of service if the power goes out. If I'd had the time to shop and investigate more thoroughly, I might have saved a few dollars, but I also knew that Costco would stand behind the product if there were any issues. I went to Costco and bought the CyberPower UPS they had on the shelf. I haven't done so yet, but I may plug my Google Nest Hub into it, as well. In my case (with Fusion IPBB), it powers the router/modem, the ATA, and the cordless phone. A standalone UPS can be used to keep anything powered. I'd make the alternate argument that a 110v UPS is more practical, as it can be used for more than a battery that keeps a router alive for a few hours. Obviously the only way to be sure about any of this is to test it. So dividing 12000mAh by 333mA gives us 36 hours. However, the data sheet for the Adtran 411 ONT claims that the power draw is less than 4 Watts, which is 333mA at 12V. So if the eight hour claim is based on a 1.5A draw, that suggests a battery capacity a bit north of 12000mAh, which is in the ballpark for a LIon battery of that physical size. They mumble something about 18 Watts continuous power, but don't actually mention a specific time or capacity at that power draw. I just visited PSI's product page for the PS18L-U2, and I find it just a little weird that nowhere do they quote battery capacity in milliamp-hours. The batteries eventually wear out - PSI only rates them for a ten year lifespan and, for the most part, doesn't do direct sales, instead going through resellers and (*ahem*) service providers. Guys, surely you must realize that, on the surface, that sounds really lame. We offer the backups as a one time purchase for new customers who have not had the chance to purchase their own yet, we do not have a supply of replacements or batteries for the units that we sell, once they are purchased from us they are completely customer-owned devices.
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