Stuff just arrived from China:
http://www.banggood.com/Matek-USB-LCD-Display-Voltmeter-Ampere-Meter-Power-Capacity-Tester-p-933952.html
3*1W LED Built-in Driver Power Supply 12V RTUS
http://r.ebay.com/3pO46i
Universal Mobile Phone Clip Bracket Holder For Tripod Stand With 1/4" Hole
http://r.ebay.com/hPsbvn
http://www.banggood.com/Matek-USB-LCD-Display-Voltmeter-Ampere-Meter-Power-Capacity-Tester-p-933952.html
3*1W LED Built-in Driver Power Supply 12V RTUS
http://r.ebay.com/3pO46i
Universal Mobile Phone Clip Bracket Holder For Tripod Stand With 1/4" Hole
http://r.ebay.com/hPsbvn
That charger doctor can still tell you the 18650 capacity (or close to it). Just use it on the charge side. Discharge the 18650, and recharge it with the charger Doctor plugged in. It won't be as accurate because of the overhead of the 18650 charger, but it will give you a rough idea,
I have one of these and it will not pass through anything to my Itouch gen3, but it works on other products I have used. Have you got any ideas? Thanks
You could always discharge the power bank then monitor how many mAh it takes to fully recharge it.
If you need memory, get either the KCX-017 or an (expensive) OLED tester like the Efan & Haoqixin USB 3.0 Meter…
I've been through my share of testers, and best bang for your buck is a KCX-017
Sound like a great project for US to build with Nano and OLED display!
why dont you just power the USB power monitor on a separate power source? It's "brains" will be powered separately. That way it won't be drawing any current itself from the battery pack, so you will get an even more accurate measurement on the capacity of the pack.
Could be time for the JIPM (Julian Ilett Power Monitor) 😉
Buying from China and similar areas I find is a bit of a lottery both with the delivery time and what you get, but I quite enjoy the gamble and it's always relatively inexpensive.
How do they pull it off? A LED driver and having it shipped halfway across the world for 60p?
Post the Ebay links please ! The item ID's.
You could probably modify the power monitor, by splitting the power supply for the brains of the unit, and power them from another source. So the USB bank under load only passes through the sensor part, and nothing else.
Pal, DIY Cam mount on flexible coolant tube if the cell phone is not too heavy.
Hi Julian,
Have you seen is Power Monitor, It has 10 data sets of retained storage?
"discharge capacity ( total of 10 groups can be stored )"
Ebay item number 311012185530 £4.39 from seller missjune2010
PS
Thanks for your podcasts I find them very informative.
FYI, the tripod thread size is "1/4-20"
What's the trick on those power banks to prevent them automatically powering down when you only have a small USB load attached?
Usually long does it take for the package to reach you from China?