Welcome Guest ( Log In | Register )

Outline · [ Standard ] · Linear+

 What is the powerbank?, Updated with Xiaomi Powerbank

views
     
DeadlySkullz
post Aug 5 2013, 08:14 PM

New Member
*
Newbie
1 posts

Joined: Aug 2013
QUOTE(x-treme @ Apr 29 2013, 07:31 PM)
Part 2: So called 20000mAh powerbank test

i had borrowed 20000mAh powerbank from my friend. Due to warranty reason, my friend not allow me to open it.
tried some method to figure out how many 18650 battery inside the powerbank, lastly i use torch light and saw there are 6 18650 battery.
What is the capacity of each 18650 battery i'm not sure, but i can test and prove it.

user posted image

Written 20000mAh, made in Taiwan
Written 2 output current: 2.1A and 1.0A. After i tested, it is just a parallel output from same source, not separated.
user posted image
This set up is similar with my part 1 test, using 2 10ohm resistor in parallel, resulting 5ohm resistance.
Output current stable: 4.79V, 0.94A
user posted image

Result are recorded, total discharge time is 4 hour 40 minutes. Total output power is 21.01Wh, only 28.4% is the REAL output power.
Rated capacity is 3.7V X 20000mAh = 74Wh (vs 21.02Wh Real)

[My tested PN-910 had discharged for 7 hour and 20 minutes, total output power is 34.13Wh, 82.4% is the REAL output power]
Rated capacity is 3.7 x 11200mAh = 41.44Wh (vs 34.13Wh Real)
user posted image

The 20000mAh powerbank had been tested for twice because the first time test i had over estimated it can discharge for at least 5 hours.
But it is actually less than 5 hours.

Dimension measurement by vernier calipers(20000mAh):135mm x 71mm x 24mm
(my friend said this unit was selling with price tag of RM110)
*
Do u know how to open this powerbank?

This post has been edited by DeadlySkullz: Aug 5 2013, 08:15 PM

 

Change to:
| Lo-Fi Version
0.0200sec    0.41    7 queries    GZIP Disabled
Time is now: 29th March 2024 - 05:04 PM