Well,this might be a very useful information when it comes to buying a power bank for phone

1) What’s power bank?
Power bank serve as an ‘extra battery’ or
external charger for your phone or other
electronic devices.
2) Where is power bank made from?
Majority of the power banks in the market
are actually made in China.
3) How do I charge the power bank?
You can charge your power bank via the
charger that came with your phone,
computer usb port or using other power bank
4) How long do I need to charge the power
bank?
It’s depending on the REAL CAPACITY of
the power bank. The larger REAL
CAPACITY, the longer charging time may
required. Different charging methods may
result different charging time as well.
Charging with the original charger will be
faster than charging with computer usb
port.
5) Why sometime I need longer time to
charge the same power bank?
Even though using the same charging
method, the charging time may be differ
due to environment,temperature, power
flow and etc
6) What is mAh?
mAh mean milli Ampere Hour, the capacity
of the power bank is measure with mAh
7) A 12000mAh REAL CAPACITY power
bank, able to charge a 1500mAh capacity
phone for 8 times full?
This is a common mistake make by most of
the people. For rough calculation of the
total charge time, kindly use this formula
REAL CAPACITY * conversion rate * phone
battery health / phone capacity = total
charge times
EXAMPLE: 12000 x 0.8 x 0.8 / 1500 = 5.12
charge times (0.5-1 times plus minus)
What’s conversation rate?
Conversation rate is the remaining
percentage of the battery after the
battery lost in heat or PCB operation.
9) What’s phone battery health?
In simple, it’s mean how‘healthy’ your
phone battery is. Phone battery storage
capacity will be lower and lower. That’s also
the reason why our phone can last longer
when it’s newly bought than after 3-6
months we used it. Different mobile phone
models also will affect the calculation as
some phone drain battery faster than the
other.
10) What’s PCB?
PCB means Printed Circuit Board,its control
all the operation flow inside the power
bank. A good quality PCB will allow the
power bank to charge more and have better
durability
11) What’s 18650 power bank and what’s
Li-Polymer power bank?
The common type will be 18650 and a better
type will be Li-Polymer
12) What’s the different between 18650
and Li-Polymer?
- 18650 size and dimension are fix. Li-
Polymer size and dimension are flexible.
- 18650 produce more heat. Li-Polymer
are much more safer
- 18650 are cheaper. Li-Polymer are more
expensive
- 18650 have higher self discharge
rate.Li-Polymer have a very low self
discharge rate
- 18650 battery durability will drop faster.
Li-Polymer battery capacity are more
durable
13) What’s the common mAh use in 18650?
Common mAh use in 18650 is around
1300mAh to 2200mAh.
14) What’s the common REAL CAPACITY in
18650 power bank in the market?
- Power bank using 1pcs 18650 is 1200mAh
– 2600mAh
- Power bank using 2pcs 18650 is 2500mAh
– 4400mAh
- Power bank using 3pcs 18650 is 3750mAh
– 6600mAh
- Power bank using 4pcs 18650 is 5200mAh
– 8800mAh
- Power bank using 5pcs 18650 is 6500mAh
–11000mAh
- Power bank using 6pcs 18650 is 7800mAh
–13200mAh
- Power bank using 7pcs 18650 (no info)
- Power bank using 8pcs 18650 is 10400mAh
–14400mAh
15) Is there any power bank use higher
than 2200mAh per 18650?
Yes. There are, but it’s not common due to
the expensive pricing.
16) What’s the different between branded
power bank and generic power bank?
Branded power bank mostly sell in REAL
CAPACITY. Generic power bank mostly sell
in MARKING CAPACITY. That’s the reason
why you will never see any branded power
bank (standard size) have anything as
high as 30000mAh – 50000mAh. That’s also
the reason why a good 12000-13000mAh
power bank are able to charge more or
about the same like the market
30000-50000mAh power bank
17) Is it true branded power bank won’t
explode and generic power bank will
explode?
Anything to do with battery, will have
chance to explode. No matter it’s branded
power bank or generic power bank.But
chances for both branded and generic
power bank to explode are near to 0%.If
power bank is easy to explode, everyone will
use power bank in war instead of bomb.

Obrigados.

Nice one OP..its really an Eye-opener 2 those dat hv minute knowledge abt power banks n it'll really go a long way in mkn ppl mk a right choice of P.Bnk 2 purchase n use, whc is as a result of d epileptic power supply in dis part of d world..thumbs up!!!

all the calculations tho. Na to carry pen and jotter go market if person wan buy power bank

Polymath56:
Nice one OP..its really an Eye-opener 2 those dat hv minute knowledge abt power banks n it'll really go a long way in mkn ppl mk a right choice of P.Bnk 2 purchase n use, whc is as a result of d epileptic power supply in dis part of d world..thumbs up!!!

Thanks man

TaiKuun:
all the calculations tho. Na to carry pen and jotter go market if person wan buy power bank

lol...na u now

What are the good brands? Are those made in China good. I see them with street vendors.

Power bank these days spoils battery
Gotta just get a phone like L5 to use to charge my other phone