- A typical Lithium battery will have between 300 and 500 full charge cycles. So if you let your phone die every day, you could need a new battery in less than a year.
- It is better to recharge your phone before it runs completely empty.
- When power is transferred, there is always loss due to resistance. Power Banks are not able to transfer 100% of their actual capacity to a device.
- The actual phone charger is in your phone. It doesn’t matter where the power comes from, charging is always the same.
Power Banks have become increasingly popular as the battery life of our beloved phones, tablets and portable media players is outstripped by the amount of time we spend using them each day. By keeping a battery backup close by, you can top-up your device(s) while far from a wall outlet. There’s no denying that power banks are an awesome invention. They are portable, inexpensive, and store back-up charge for those times when we need to revive a dying phone’s battery. And they come in shapes and sizes for every need and customer – some are small and pocket-friendly, carrying about 2,000 to 3,000 milliamp-hours (mAh) of charge, while others are chubbier yet more capacious, storing over 10,000 mAh inside their battery cells.
The question on the libs of most power bank users and intending users is how safe is the use of power banks? We will address this question in this article.
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Now let’s go technical, battery cells based on lithium-ion chemistry, such as the one inside the bank and your smartphone, have a nominal or average voltage of around 3.7 volts. Average because a battery’s voltage does not remain constant – it drops as energy reserve is used and increases as the battery is being recharged. Modern smartphone batteries are considered 100% full at about 4.3 volts and empty as they get drained to around 3 volts, hence the 3.7 V figure above. Unfortunately, this low and varying voltage is of no use to your smartphone.
To get the charging voltage flowing, a power bank provides 5 volts of boosted voltage output, not 3.7 volts. This is the standard voltage a smartphone’s charger (or a computer’s USB port) delivers, and that’s what the charge control circuitry inside a smartphone expects to receive. These 5 volts are then precisely stabilized by the phone’s circuitry and reduced to match the maximum voltage of the phone’s battery, which is somewhere around 4.3 volts. This may all seem like oversupply, but it is not. All this precise control over the charging process is implemented for safety reasons because a battery may explode if it is fed more voltage than it can handle. Conversely, a battery will not charge to its best potential if it is provided with less voltage than it is designed to receive.
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When power is transferred, there is always loss due to resistance. Power Banks are not able to transfer 100% of their actual capacity to a device, so we factor in this loss when calculating how many times an average device can be charged from a fully powered Power Bank of any given size. The actual phone charger is in your phone. It doesn’t matter where the power comes from, charging is always the same.
Modern Lithium Ion and Lithium Poly cells do benefit from being “topped off”. There is no lifetime penalty for charging before they’re depleted. In fact, letting a battery get too low will reduce its lifetime. You count on the phone’s software to prevent the most extreme form of this, but it’s far better to charge before the battery dies. A typical Lithium battery will have between 300 and 500 full charge cycles. So if you let your phone die every day, you could need a new battery in less than a year. Most people don’t do that, and so it’s more common to get two or so years out of that cell.
It really depends on your charging habits. Batteries die more and more every full charge cycle. Its usually a better idea to invest in an extended battery which often times is cheaper without the hassle. If you recharge twice a day and charge normally once. Theoretically, your battery will degrade 66% faster then one charge a day. But rarely will you be charging 3 times a day. Expect a number closer to 25%-35%. So if the average battery’s optimal life takes a year to degrade, expect yours optimal life to be roughly 9 months. Of course at 9 months, your battery doesn’t just stop working. Over each charge and month, your losing more and more charge capacity to the point where it’s inconvenient because your recharging so much.
Finally what you need to know is Power banks cannot Damage your phone or battery because The actual phone charger is in your phone. It doesn’t matter where the power comes from, charging is always the same.
