Worth a look for anyone replacing a battery in a security system, scooter, or backup power supply, since this 12V 7Ah sealed lead-acid design is built as a direct swap for most existing units without rewiring. Buy Now at Home Depot

Four batteries in one pack suits anyone running multiple ride-on toys, security systems, or backup devices that rely on 12-volt 7Ah power, saving you from ordering replacements one at a time. Home Depot's bundle works out cheaper per battery than buying these individually elsewhere. Buy Now at Home Depot

Update: The price has dropped to $37.99 since this was originally published.

Keeps your Quest 3 controllers powered without burning through disposable batteries, a solid pickup for anyone who games often enough to drain them weekly. It's $23 off the $63 list price at Walmart. Buy Now at Walmart

Worth a look if your under-desk elliptical's original power supply dies, since replacements from the original brand can be pricier or harder to track down than a compatible charger from Newegg. Buy Now at Newegg

Anyone building a custom power bank or battery pack project will want this on hand to safely step up 18650 voltage while managing the charge cycle, no separate charging and boosting circuits needed. Buy Now at Newegg

Stocking up makes sense for households with smoke detectors, remotes, and other low-drain devices, since a 12-pack means you're not reordering every few months. Newegg has these priced for the bulk count, which beats grabbing single 9V batteries off a store shelf each time one dies. Buy Now at Newegg

These work for keyless entry fobs, watches, and small electronics that take a CR2032, and having six on hand means you're not making a separate run every time one dies. The sale only knocks 30 cents off the $4.99 list price, so buy these for the convenience of a multi-pack rather than any real discount. Buy Now at Amazon

Anyone running Topcon TP-L4 or TP-L5 laser levels on job sites will want this adapter on hand to charge batteries directly without needing a separate standalone charger unit. Buy Now at Newegg

This works for topping off car, boat, or RV batteries over the winter without frying them, since it switches to maintenance mode once fully charged. At $43, that's $24 off the $67 list price. Buy Now at Walmart

Handy for anyone who's been stranded with a dead battery, this jump starter also doubles as a power bank and flashlight for roadside emergencies, and it's currently $25.30 off the list price at Walmart. Buy Now at Walmart

Gotrax e-bike owners who need a dependable backup or replacement charger will find this one matches the stock 42V output without paying bike-shop markup prices, and Newegg has it ready to ship. Buy Now at Newegg

Riders who own the isinwheel S7 kids scooter will want a dependable replacement charger on hand, and this one outputs the exact 29.4V the battery needs. Newegg carries it as a straightforward, scooter-specific option rather than a generic universal charger. Buy Now at Newegg

Your original Hypersphere charger broken or missing, this replacement adapter gets your massage ball powered back up without having to buy a whole new unit. Buy Now at Newegg

Worth grabbing if your Roomba 500 series robot vacuum is holding less charge than it used to, since a worn-out battery is usually the culprit behind shorter run times and spotty cleaning. Having two batteries on hand also means you're covered once the first one eventually wears down again. Buy Now at Home Depot

This works well for maintaining car, motorcycle, or marine batteries over winter storage without risk of overcharging, and it's compatible with both 12V and 24V systems. At $24.29, that's $15.70 (39%) off the $39.99 list price. Buy Now at Walmart

Keeping a car, boat, or motorcycle battery topped off over winter storage is what this charger handles, switching automatically between charging and maintenance modes so you don't overcharge it. Walmart has it for $17.99, which is $15 off the $32.99 list price. Buy Now at Walmart

Boaters who deal with drained batteries at the dock will appreciate having a reliable jumpstart on hand without hauling out a full generator, and the AC/DC flexibility means it works whether you're plugged into shore power or running off the boat's system. Buy Now at Newegg

Swapping dead D batteries for a constant USB power source makes sense for gadgets that drain batteries fast, like certain clocks, radios, or toys you use often. Buy Now at Newegg

Your backup power system, wheelchair, or alarm panel will run on this if it takes a 12V 35Ah sealed lead acid battery, and it's a straightforward swap for anyone replacing a worn-out unit rather than shopping for something new. Home Depot carries it for buyers who want a dependable replacement without hunting down the original equipment manufacturer's part. Buy Now at Home Depot

This battery works well for keeping your Troy-Bilt 7,000-Watt Generator starting reliably once the original battery stops holding a charge, saving you from replacing the whole unit over one failing part. Buy Now at Home Depot