What is a Lithium-ion Battery?

Every type of battery creates electricity by turning chemical energy into electrical energy. It does this by using chemical reactions to create a flow of electrons from one material to another. We’ll spare you the rest of the science lesson. The important thing to know is that the materials used (lead-acid, alkaline, nickel-cadmium, etc.) all have different charging properties.

Lithium batteries use – you got it – lithium in metal or ion (Li-ion) form as their anode material. And they come with several advantages. Lithium-ion batteries are easily rechargeable and have the highest energy density of any battery technology, meaning they pack more power into a smaller space. They also can deliver a voltage up to three times higher than other battery types. For this reason, you’ll find lithium batteries in almost all modern portable electronic devices.

The list includes smartphones, laptops, tablets, eReaders, smart watches and Bluetooth headphones. Larger lithium battery packs are also used to power things like electric scooters, hoverboards, e-bikes and even electric cars.

How to Store a Lithium-ion Battery

If you’ve flown on an airplane or shipped a package recently, you’ve probably seen warnings related to proper lithium battery storage. That’s because lithium batteries have been known to cause fires when they’re damaged or stored improperly.

To safely store your lithium-ion batteries, follow these tips:

  • Avoid temperature extremes. Experts say the ideal temperature for storing lithium batteries is around 60 degrees Fahrenheit. Storing a battery in extreme hot or cold temperatures will reduce its lifespan. That includes exposing your battery to direct sunlight.
  • Keep them dry. Wet or humid environments can cause lithium batteries to rust or leak. In a worst-case scenario, moisture could even create an electrical short.
  • Store them partially charged. For longer-term storage, keep your batteries at about a 40 to 50 percent charge. Storing a fully charged battery can reduce its storage capacity. And when you store a completely dead battery, you risk it dropping to a zero-voltage state. When this happens, the battery may not be able to recharge – rendering it permanently disabled.
  • Remove batteries from your device. When storing a battery for long periods of time, remove it from the device, if possible. Even if your device is powered off, there is still a small electrical current running through the battery – which can cause a complete discharge over time.
  • Store in a safe place. Never store lithium-ion batteries near flammable or combustible materials.

When bringing your devices inside, make sure you store them in an area that won’t block a means of egress in the event of a fire. For example, storing a regular bicycle near your back door would be fine, but you wouldn’t want to do that with an e-bike. Lastly, make sure that your smoke detectors are functional and will warn you right away if there’s a fire.

How to Charge a Lithium-ion Battery

To get the best performance out of your lithium battery, try to recharge it before it’s completely dead. A good rule of thumb to follow is plugging in your device when the battery reaches 10 to 20 percent of its remaining capacity.

A fully discharged battery adds extra stress to the components, which can reduce its lifespan. So it’s always better to top off your device’s charge throughout the day than to wait for it to die completely.

It’s also worth noting that overcharging can damage lithium batteries, too. While most devices have protective circuits to prevent overcharging, you may still want to consider unplugging your device or battery from the power source after it’s been fully charged. Speaking of charging, only use the charging cable or dock that was provided with your device. Other chargers (while they may claim to charge faster) can damage the battery.