PowerBankExpert.com is reader-supported. If you purchase products via the links on our site, we might earn affiliate commissions.

How Long Does a Power Bank Keep its Charge?

How Long Does a Power Bank Keep its Charge?

Most people that purchase power banks rely on them on a daily basis. But sometimes it takes a long time between charging up the power bank and actually use it. It can be weeks or even several months between two uses of the device. 

One common scenario is that of people that buy power banks for emergency situations. For example, you can get a power bank that has a jump-starter feature, charge it up fully and then just leave it in the trunk of your car for when you need it. But it might happen that you’ll need it after one year. Will it still be fully charged after such a long time? Or will it be depleted? This is what we’re exploring in this article. 

The average depletion rate for a fully-charged power bank

The fact of the matter is that any battery will lose its charge after a while. How long it takes for this to happen depends mostly on the type of the battery and it’s built quality. This holds true for power banks as well, which are nothing else than fancy batteries.

In general, you can expect a high-quality power bank to hold its full charge for three to six months with no battery loss. When we refer to a ‘high-quality’ power bank, this means it has safety features, designed with protective materials resistant to water and heat, lithium-ion batteries, and more.

On the other hand, low-quality power banks can hold their charge around four to six weeks. As it is with many other products, you get what you pay for. 

Factors that result in power loss

Power banks are effected by their treatment and the environment they’re exposed to. Storing your device in a car where the temperature constantly changes can affect its charge, while also damaging the device’s lifespan in general. In order to make the most of your portable charger, you should safely store it in a ventilated area between 30-90 degrees. 

Avoid keeping the device in a humid area. Moisture can seep into the batteries, causing rust, and damaging the battery’s condition. 

Not using your power bank for three or more months can impact its performance, lifespan and result in poor battery life. If you own a power bank that you’ll only use for emergencies, ensure you periodically drain it and charge it back up to prevent the battery from depleting when you need it most. Don’t expect to store it in your car for a year or more and return to a fully-charged device.

Make sure not to drop your portable charger. It contains fragile components and a circuit board that can be easily damaged, thus affecting its battery life.

Finally, the type of battery used to build the portable charger is another factor that determines long-term power loss. Ther are basically two different types of batteries in power banks Lithium-ion (Li-ion) and Lithium-Polymer (Li-Po). Li-ion batteries are more common when it comes to power banks and they can hold their charge for longer, even when not in use. They can provide more energy, resulting in a quicker charge. So if you want to get a portable charger that holds it’s power for the longest amount of time when not used, then make sure it has a Li-ion battery. 

Ways to prevent power bank battery loss

You can actively prevent a power bank’s battery loss by simply being a responsible owner. First, try to keep the battery power on at least 50 percent. When the power bank reaches below half state, the battery cells are more likely to get damaged. 

If your device contains lithium-ion batteries, partial top-ups of 10, 20 and 30 percent can prolong its lifespan. Getting in the habit of doing this can also help the device to retain its charge for a longer period of time, too.

Even if you don’t need to use your power bank, it’s best to charge it at least every three months to boost the battery and keep it in proper working order. 

Looking after your power bank

You can enhance your power bank’s performance when you use it properly. For example, when charging a smartphone, ensure you disconnect the power bank as soon as it’s fully charged. Keeping it plugged in for longer won’t increase its charge, and cause battery wear.

Even if your power bank allows for pass-through charging, as much as you can, don’t make use of this function. Doing so can contribute to excessive heat production and affect battery life, due to multiple charges. 

Each power bank has a number of charge cycles before the battery performance starts to take a noticeable hit. The average figure for this is 500 cycles. Even if you charge the power bank even up to 20% or 30%, it’s still considered a charge cycle. Keep this in mind when using your portable charger. Ideally, top it up to 100% every time. 

With these facts in mind, we hope you are able to effectively maintain your power bank’s battery so you don’t arrive at a depleted power bank when you need it most.