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Stardate: 20190205.1822 | |
Location: Work Cubicle | |
Input Device: Gemini PDA | |
Audio: Pete Tong - Essential Selection Spring 2000 | |
Visual: Work desk with monitors, Das Keyboard 4 Ultimate, USB | |
fireplace, homemade USB xmas lantern w/lights. | |
Energy: 70% | |
Mental: 70% | |
Emotional: Amplified from coffee and techno music. | |
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I brought out my West Mountain Radio CBA II (Computerized | |
Battery Analyzer)[1] the other weekend and tested the | |
capacity of the batteries for the Cybah Rig. The batteries I have | |
been using are the APC M12USWH, which are the batteries used | |
for the APC Back-UPS Connect 50 Lithium Ion Network UPS / | |
Mobile Power Bank.[2] I have this running as backup for a | |
Raspberry Pi server at home and since I had a spare battery, | |
or so I thought, I decided to use the spare for the Cybah | |
Rig and swap out the batteries for charging. | |
Previously, one of the batteries had failed while I was | |
writing a phlog entry and I lost most of the contents of the | |
file I was writing. [3] This prompted for the battery | |
capacity testing. | |
My setup was basically my Fujitsu P1610 running Windows XP | |
Tablet and Offline Edition running CBA II software, CBA II | |
unit, a bunch of test cables, and the APC USB battery. The | |
battery's capacity is 11400mAh. During my test I set the | |
load at 1 Amp @ 5 volts. Typically, the Cybah Rig runs less | |
than 800 milliAmps at 5 volts. This is including the | |
Raspberry Pi Zero W and the Fujitsu FMD-250w. Here's a pic | |
of the setup.[4] | |
The first battery, which I labeled as APC1 turned out to be | |
good. I tested this one with 5 volts at 1 Amp load. This | |
resulted in 33.09Ah total, which I found strange since the | |
battery is only rated at 11400mAh. I might need to retest | |
this one, but the capacity is good. Here is the graph of the | |
results. [5] | |
The second battery was labeled APC2 and this one turned out | |
to be the bad one. It resulted in only 1.24Ah total. I will | |
retest this one as well, but I think it's spent. Hopefully, | |
I can take it apart and replace the internal battery cheaper | |
than buying a new one. Here are the results. [6] | |
I had tested the load of the Cybah Rig with a neat little | |
Chinese USB muli-tester (UM25C) that I picked up on Amazon. | |
[7] It's pretty neat because it can test voltage, current, | |
resistance, etc., accepts different cable types, has a pretty | |
display. It also has bluetooth that you can view the data | |
on your laptop or Android device in real time as well as save | |
the data from your tests. Not sure how much I trust the app | |
so I have it running on test devices. The USB tester is so | |
much better than the makeshift ghetto rigs I set up with my | |
multimeter. Plus it logs the data. | |
Here is a picture of the UM25C attached to the APC USB | |
battery on one end and the Cybah Rig on the other. The meter | |
shows the current load of 0.5429Amps at 4.986 volts. [8] | |
Here is a picture of the graphed results of the Cybah | |
Rig with the Face-Mounted Display in use and the Raspberry | |
Pi Zero W running system updates. I only ran it for about | |
10 minutes and then shut down after the updates were done. | |
The data was exported from the Android application | |
and imported into Excel for the pivot graph. The total load | |
did not go over 0.9Amps (or 900 milliAmps.) [9] | |
If the capacity of the APC1 battery is truly 33.09Ah, I can | |
get over 36 hours of runtime for the Cybah Rig! Not that I | |
need that much...my eyes would probably start bleeding and | |
I'd be vomiting well before I hit that threshold. | |
<-------------------------------------------------------------------> | |
[1] West Mountain Radio | |
[2] APC Back-UPS Connect 50 | |
[3] 20190120_cybah_rig | |
[4] APC M12USWH Battery Capacity Testing Setup | |
- APC M12USWH 11400mAh, 41.2Wh(rating), [email protected] USB, 5v@1A USB | |
- Fujitsu P1610 -> USB type A male to USB type B male -> | |
West Mountain CBA II -> Home made power pole to T connector | |
pigtail -> T Connector to alligator clip pigtail -> | |
male jumper wire to male jumper wire -> female | |
breadboard jumper wire to USB -> APC M12USWH Mobile | |
Power Pack. | |
[5] Good battery. | |
- Graph of CBA II capacity test results for APC 1 | |
battery (5 volts @ 1A load, 33.09Ah total) | |
[6] Bad battery. | |
- Graph of CBA II capacity test results for APC 2 | |
battery (5 volts @ 1A load, 1.24Ah total.) | |
[7] UM25C USB Meter | |
[8] UM25C USB Load Test | |
- UM25C USB meter hooked up to Cyber Rig showing load @ | |
0.5429A @ 4.986v | |
[9] UM25C results | |
- Graphed results of Cybah Rig from the UM25C USB meter. | |
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