When it comes to powering your trusty internet gateway, not all batteries are created equal. The best battery for your modem depends on its specific requirements, but generally, you're looking at 12V sealed lead-acid batteries or lithium-ion alternatives. These power-packed dynamos provide the juice needed to keep you connected during those pesky outages.

For most residential modems, a 12V 7Ah sealed lead-acid battery is the go-to choice. It's like the Swiss Army knife of modem batteries – reliable, widely available, and packing enough punch to keep you online for hours. But before you rush out to grab one, double-check your modem's specs. Some newfangled models might have different voltage requirements or even proprietary battery designs.

For most residential modems, a 12V 7Ah sealed lead-acid battery is the go-to choice. It's like the Swiss Army knife of modem batteries – reliable, widely available, and packing enough punch to keep you online for hours. But before you rush out to grab one, double-check your modem's specs. Some newfangled models might have different voltage requirements or even proprietary battery designs.

In terms of runtime during an outage, most modem batteries will keep you connected for 4-8 hours. That's enough time to finish binge-watching your favorite show or panic-googling "how long do power outages last?" But remember, this is just a backup, not an invitation to go off-grid. Excessive use will shorten the battery's overall lifespan faster than you can say "buffering."

Finding a trustworthy modem battery isn't like searching for a needle in a haystack, but it does require some savvy shopping. Your best bets are electronics retailers, both online and brick-and-mortar. Think Best Buy, Amazon, or NewEgg – they're like the Avengers of tech shopping, assembling a range of options for your perusal.

For the more adventurous, manufacturer-specific stores or websites can be gold mines for exact replacements. Just be wary of too-good-to-be-true deals on obscure websites; you don't want your internet lifeline to be as reliable as a chocolate teapot. And if all else fails, your Internet Service Provider might have compatible batteries available. They're in the connectivity business, after all!