Lithium batteries power an enormous range of devices, from the smartphone in your pocket to implanted heart monitors and orbiting satellites. Electric vehicles now account for over 70% of all lithium-ion battery deployment worldwide, but the technology shows up in nearly every corner of modern life. Here’s a breakdown of where lithium batteries are used and why they’ve become so dominant.
Everyday Electronics
The devices you use daily almost certainly run on rechargeable lithium-ion batteries. Smartphones, laptops, tablets, digital cameras, smartwatches, wireless earbuds, handheld gaming devices, and e-readers all depend on them. The appeal is simple: lithium-ion cells pack a lot of energy into a small, lightweight package, which is exactly what portable electronics need.
Interestingly, portable electronics used to be the biggest consumer of lithium batteries. In 2015, nearly half of all global battery demand came from this category. By 2025, that share had dropped below 5%, not because electronics use fewer batteries, but because electric vehicles and energy storage have grown so rapidly that they’ve dwarfed everything else.
Electric Vehicles
Electric cars, buses, e-bikes, and scooters represent the single largest use of lithium-ion batteries today. According to the International Energy Agency, EVs consume more than 70% of total lithium-ion battery production globally. The battery pack in a typical electric car stores far more energy than thousands of phone batteries combined, which explains why EVs dominate the market even though there are billions more phones in the world.
Beyond passenger cars, lithium batteries power electric forklifts, golf carts, electric motorcycles, and an expanding fleet of commercial delivery vans and trucks. The same core chemistry scales from a small e-bike cell to a massive bus battery pack.
Home Energy Storage
Battery energy storage systems now represent over 15% of global lithium-ion deployment, and that share is growing. Homeowners increasingly pair rooftop solar panels with lithium-ion battery systems to store excess energy for use at night or during grid outages. A typical residential system stores around 10 to 20 kilowatt-hours, enough to keep essential appliances running for several hours when the power goes out.
Lithium-ion is the most common chemistry for home storage, with tens of thousands of residential systems already installed across the United States alone. On a larger scale, utility companies use massive lithium battery installations to smooth out the variable output of wind and solar farms, storing energy when production is high and releasing it when demand peaks.
Medical Devices
Lithium batteries are critical inside the human body. Cardiac pacemakers have relied on lithium primary (non-rechargeable) cells for decades because they deliver reliable, steady power in the microampere range for years without replacement. The high energy density of lithium chemistry allows these batteries to be small enough to implant comfortably under the skin.
Implantable cardioverter defibrillators, which continuously monitor heart rhythm and deliver a shock to correct dangerous arrhythmias, need batteries capable of sudden high-current pulses. Specialized lithium chemistries meet that demanding requirement. Neurostimulators, used to manage chronic pain and conditions like Parkinson’s disease, also run on lithium cells, and newer rechargeable versions allow patients to go longer between surgical battery replacements. Implantable drug delivery systems round out the list of devices that depend on lithium’s combination of small size, long life, and dependable output.
Outside the body, portable medical equipment like blood glucose monitors, hearing aids, and portable defibrillators also commonly use lithium batteries.
Wearable Technology
Smartwatches, fitness trackers, and wearable medical sensors all run on small lithium-ion cells. These devices need batteries that are lightweight, compact, and able to withstand bending or movement throughout the day. Lithium-ion’s high energy density relative to its weight makes it the go-to choice, and manufacturers are actively developing flexible lithium-ion cells that can conform to curved surfaces like wristbands or even clothing.
Drones and Aerospace
Unmanned aerial vehicles, both commercial and military, rely heavily on lithium batteries. Consumer camera drones, agricultural survey drones, and delivery drones all use lithium-ion or lithium-polymer packs because flight demands a power source that is both energy-dense and light. Every extra gram of battery weight reduces flight time, so lithium’s superior energy-to-weight ratio is especially important here.
Military drones use lithium batteries for surveillance, border patrol, battlefield supply delivery, and naval escort missions. Satellites in orbit also use lithium-ion batteries to store energy collected by solar panels, providing power during the portions of each orbit spent in Earth’s shadow.
Power Tools and Outdoor Equipment
Cordless drills, saws, leaf blowers, and lawn mowers have largely shifted from older nickel-based batteries to lithium-ion packs. The advantages are practical: lithium-ion tools are lighter, hold their charge longer between uses, and don’t suffer from the “memory effect” that plagued older rechargeable batteries (where partial discharges gradually reduced total capacity). This same shift is happening in outdoor power equipment, with battery-powered chainsaws and snow blowers replacing gas-powered models.
Non-Rechargeable Lithium Batteries
Not all lithium batteries are rechargeable. Primary (single-use) lithium cells power a separate category of devices that need long shelf life and steady, low-drain power. Smoke detectors, utility meters for water and gas, remote environmental sensors, GPS trackers, and some military equipment all use primary lithium batteries. These cells can last 10 years or more in low-power devices, making them ideal for “set it and forget it” applications where frequent battery changes aren’t practical.
The common lithium coin cells in car key fobs, watches, and small remote controls also fall into this category. They’re distinct from the rechargeable lithium-ion cells in your phone, but they share the same underlying advantage: lithium’s high energy density lets a small battery last a long time.