BEWARE OF POWER BANKS THAT
HAVE RECYCLED BATTERIES OR FAKE CAPACITY BATTERIES
Are all
Power Banks the same?
We have had first hand experience of Chinese
companies trying to sell us Power banks with bad quality recycled batteries.
In fact this is a booming business in China, many factories strip
down old laptop batteries and put these into power banks for resale in their
domestic market. A lot of these power banks end up being sent to the
west. Fortunately at Gecko Media we know how to test batteries true
capacity and output endurance. Batteries come in various grades and it’s important
to know what quality you are purchasing. The second part of a power bank that
is critical is the IC chip. We ensure that our factories have thoroughly
tested their circuits.
Below is an excerpt from an article
translated from Chinese. It was posted by a Taiwanese called 曾家辉 on his Facebook page. The photos are taken
from his original article.
Beware of dishonest cheap power
bank that claim have high mAh capacity.
One of the key issues of mobile phones,
particularly smart phones, is that they are power hungry causing their battery
doesn’t last long. As a result, mobile power bank comes into the market as
portable external power source to supplement the internal battery of the mobile
phone or mobile device.
While most of the modern mobile devices
nowadays are using Li-Polymer battery (锂聚合物电池) as their power source, a lot of mobile
power banks are using the cylindrical or prismatic Li-Ion battery (锂离子电池).
The major problem or hazard of Li-Ion battery
and Li-Polymer battery is that, they can overheat when charged for long time.
There is an overcharge prevention IC on its circuit board to cut off the
charging when the battery is fully charged. If the IC is malfunctioned, the
battery could caught fire or explode when overcharged.
Another disadvantage of Li-Ion battery is
their lifespan will greatly reduced if they are operating in high temperature
of 45°C and above. Li-Polymer battery, on the other hand, has higher endurance
to high temperature, and can still operate over 4 hours in 85°C without much
problem.
Nowadays, you can find a lot of power banks
claimed to have charge capacity as high as 12000mAh, 18000mAh, 20000mAh, or
even higher, selling at the Internet stores. If they are unbranded and selling
at a very cheap price, you need to be alerted before placing your order.
The shorter power bank in the picture above
consists of 4 Li-Ion 18650 batteries, while the longer one consists of 6 Li-Ion
18650 batteries. The size of the cylindrical Li-Ion battery in used is
18.25x65mm, and their manufacturing part number is normally in the form of
XXX18650-XX.
The quality of Li-Ion battery differs.
Branded made-in-Japan (eg. Sanyo, Panasonic)
one normally has capacity of at least 3100mAh, and comes with 1 year warranty.
They have higher price too and won’t be chosen to make the cheap power bank
selling in the Internet stores.
Branded made-in-Korea (eg. Samsung) one is
quite reliable too. Part number could be ICR18650-30A, ICR18650-28A,
ICR18650-26F, ICR18650-26D, ICR18650-24E, ICR18650-24F, ICE18650-22F, etc. 30F
means capacity is 3000mAh, 22F means capacity is 2200mAh, and so on.
Samsung OEM made-in-China Li-Ion battery has
4 grades. The highest A01 grade normally reserved for Samsung own use, while
A02, A03 and A04 are made available for customers. Part number could be
ICR18650-20, ICR18650-22, ICR18650-24, ICR18650-26, etc. If a power bank
claimed to use Samsung batteries, the batteries inside are probably the A02~A04
type.
Certain unbranded made-in-china battery were
found to have only 1600-1800mAh but also put in the 18650 code and claimed to
have 3000mAh. The cheap power banks probably are using this kind of Li-Ion
battery.
For the power bank with 12000mAh capacity
above, its capacity is calculated like this:
3000mAh x 4 = 12000mAh
However, if the real capacity of the
batteries inside is only 2200mAh, you can only get 2200mAh x 4 = 8800mAh.
For the power bank with 18000mAh capacity
above, its capacity is calculated like this:
3000mAh x 6 = 18000mAh
However, if the real capacity of the
batteries inside is only 2200mAh, you can only get 2200mAh x 6 = 13200mAh.
Beside the possible short-change in real
capacity, since the size of the Li-Ion batteries are the same, some dishonest
power bank might even use recycled batteries!
The picture above is said to be taken from a
newly purchased cheap power bank, opened up for inspection. Note that the
colour of the 6 Li-Ion batteries are all different, which is very unlikely if
they are manufactured from the same batch.
Also note that the soldering point is rusted
and shows sign of multiple re-soldering. There is also leftover glue on the
surface. Worse still, what if the cheap dishonest power bank does not have a
properly functioning overcharge / over-discharge circuit? And even more
ridiculous case, you probably get only a single Li-Ion battery with 2 bags of
sand.
The bottom result is you need exercise
caution when purchasing Powerbanks from China, especially when the product is
unbranded and the price is cheap.