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5 Things You Might Not Know About Powerbanks

Most people buy powerbanks based on indicated charging capacities. However, there are some details that we need to understand in order to maximize the use of these rechargeable batteries.

Yugatech 728x90 Reno7 Series

Powerbanks have become a huge secondary market commodity following the popularity of smartphones and tablets. It’s not a huge business that a lot of brands are coming out left and right.

In this quick guide, we explain why not all powerbanks are created equal.

1) Re-Charge Cycles and Lifespan. Powerbanks, like any other rechargeable batteries have a recommended recharge cycle. A good powerbank will have somewhere around 500 recharge cycles while sub-standard ones will have around 300 cycles only.

If you recharge your powerbank once a day, that means the lifespan can be somewhere between 300 days to 500 days. Once this re-charge cycle is fully consumed, the powerbank will no longer be able to re-charge to its usual capacity and degrades to about 50-70%.

2) Power Storage Capacity. Powerbanks cannot store 100% of the full power capacity that it states it can. Good ones can give you between 70 to 80%. Great ones like Anker powerbanks can go as much as 85-90%. That means if your typical powerbank says it can do 10,000mAh, the actual capacity could just be 7,000mAh.

This is called discharge efficiency and what is wasted or lost in the process is due to the internal circuitry of the powerbank as well as how good/efficient the batteries inside are.

3) Double A Batteries (cylindrical lithium-ion rechargeable). Most powerbanks use a 65mm AA-like re-chargeable batteries (18650, cylindrical lithium-ion rechargeable) connected in a series. These are easier to source, manufacture and assemble. That’s the reason why a lot of powerbanks have similar but odd-numbered capacities like 5,200mAh or 10,400mAh.

This is because they use multiple re-chargeable batteries (multiples of 2200mAh to 3400mAh) and not just one single large Li-Ion block. Some powerbanks which have thinner profiles do use a specific rectangular-shaped batteries like in smartphones.

4) Output Voltage and Output Current. The symbol mAh does not mean milliamps as most of us refer to but is actually milli ampere-hour and means measure of electric charge. One the other hand, Watt Hour (Wh) is a measure of electric energy.

The relationship of the two is shown in this formula:


milliamp-hour = watt-hour × 1000 / V

or

mAh = Wh × 1000 / V

The typical voltage for Li-Ion in powerbanks is 3.7V but output can go up to 5V. This is the reason why we see either of the two numbers in smartphones, laptops, or powerbanks.

The output current is measured in ampere which states how fast the current is passed thru the device. Most smartphones will use 1A while bigger tablets like the iPad might need 2.1A. Powerbanks have different ports for 1A and 2.1A while a fewer ones like Anker have intelligent sensing ports that auto adjusts the current depending on what the device needs.

Some phones like the Oppo Find 7 can handle up to 4A of current without damaging its internal battery.

5) Charging Cables. Charging cables are not created equal. Most cables have a data wire and a charging wire within the cable itself.

Typical charging cables are in the 28/28 gauge range with a wire diameter of about 0.321mm (first number represents the gauge of the data wire and the second number represents the charging wire). This is the reason why some cables could not charge phones or indicate slow charging.

We suggest getting a 28/24 gauge cable which are thicker. The 24 gauge ones are about 60% larger in diameter (0.511mm) and can handle 2amps of current. Of course, the cables can only transmit the same amount of power as the powerbank or power charger supplying it.

We also suggest to not attach the cable to the powerbank when it is not in use, especially in storage. It can still be feeding a small amount of current that can slowly discharge the powerbank.

{source}

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Avatar for Abe Olandres

Abe is the founder and Editor-in-Chief of YugaTech with over 20 years of experience in the technology industry. He is one of the pioneers of blogging in the country and considered by many as the Father of Tech Blogging in the Philippines. He is also a technology consultant, a tech columnist with several national publications, resource speaker and mentor/advisor to several start-up companies.

38 Responses

  1. Avatar for Darwin Del Rosario Darwin Del Rosario says:

    Nice info! :)

  2. Avatar for Random Random says:

    why so rude ppl

  3. Avatar for Iwillteachyoubasics Iwillteachyoubasics says:

    The battery is not connected in series!
    it is in parallel! OMG study before posting!

  4. Avatar for anna anna says:

    ganda ng environment dito, open to all, all comments and suggestions andito. sa techpinas dinelete post ko and na block ako kasi i was hitting the author for copying an article from another website.

  5. Avatar for CocoLoko CocoLoko says:

    It should also have a safety cuT-off feature. We all know that charging high capacity powerbanks really takes a lot of time. That is why, some of us charge it overnight. If the powerbank have this feature then LESS WORRIES.

  6. Avatar for arvi arvi says:

    Any reputable author would think twice before making a technical statement that isn’t completely true or even WRONG! Study basic electronics before making a technical discussion about consumer electronics’ specs.

    Clarification on # 2:
    Power Storage Capacity
    “Powerbanks cannot store 100% of the full power capacity that it states it can.” This is not the reason why we cannot get the full capacity as the powerbank tells us. geez.

    Powerbanks in essence should charge their batteries at full capacity or very near under normal circumstances. Let’s say a 10,400mAh can actually contain 10,400mAh capacity. So next question is, is it true that we cannot harvest all 10,400mAh worth of charge? YES we cannot. While the idea of the #2 is real, it doesnt mean because the battery cannot be charged completely. IT IS BECAUSE THERE IS CONVERSION LOSS DURING USAGE. NOT because the battery aren’t actually fully charged. Dont buy from a powerbank manuf if they claim it cannot charge the battery at full capapcity. I believe the author is very mis-informed or didnt read more about powerbanks and voltage converters/regulators.

    Here is the most relevant explanation in consumer lingo as possible:

    While mAh capacities can be computed from the specs of the batteries inside the powerbanks. We cannot fully harvest every mAh of it because of the conversion losses that includes resistance, heat losses and other factors. So what conversion loss is? Definitely it is not what the author explained. i have a 10,500mAh and 15,600mAh powerbanks and i only get at least 8000mAh and 12,500mAh from both of them per my estimate. So where goes the remaining advertised capacity? The circuits inside consume energy too. Where do you think they get the power to get the circuits running to maintain clean and regulated 5v to your phones and tablets? Of course circuits must consume power or energy from the battery in order for them to work.

    The powerbanks contains 5v regulators and Voltage converters. These circuits consume generous energy in order to do its job. Regulators needs higher input voltage and some current to operate thus consuming energy. Voltage converters is also a power hungry circuit since it does more than regulators. Imagine how a single 3.6v battery powerbank deliver a 5v charging voltage to your iphone? It needs a series of step up circuits with capacitors and/or AC generators to convert 3.6v to 5v and you just cant use transformer alone since it is first in DC.

    Our world is not a perfect world and thus the circuits and powerbanks we use. Battery age too so it cannot charge full capacity in 2 years on daily use. But still, the author’s context is still wrong. Being not perfect is not an excuse in this one. Editor’s job must be used to an extent.

  7. Avatar for boy tofu boy tofu says:

    hohum…

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