Putting right a few wrongs. The 2-cell power bank isn't as bad as I thought.
By Julian
Youtuber, shed dweller, solar charge controller aficionado
Good morning all…
Youtuber, shed dweller, solar charge controller aficionado
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How's the 3-cell holding up?
Are you going to test rest of your power banks with the "charger doctor".
I'm curious is the three x 18650 power bank is good quality charging too.
A Voltage under 4.5v is not really useful for charging a phone battery because phones don't have a step up conveter so the battery can only get fully charged when it get's 4.1-4.2V but there is a small voltage drop on the internal diode/mosfet in a phone so you need a bit higher voltage then the battery requires. Normaly you only get full charge speed when you apply 4,7-5v on a phone.
I would say:
Not that good, they should switch off the output when powering down.
Still, could you do a video about ID/charge resistors:
You got:
The USB standard
The Apple-way
The SnapDragon QuickCharge way (1.2V on both??, need to figure out for a 2A mod)
The Other(tm) ways
The packs that allow 5 positions for resistors is a big advantage as far as I see it.
The problem is just: what to add?
Why limit yourself to USB only? the laptop powering(12V/15V/19V) power-banks are nice too 🙂
And I managed to get the transistor/FET/whatever 3 pin thingie on my biggest bank to unsolder itself by overload, easy fix but still it should not happened.
I can take them apart and do a video showing the internals, if you insist 🙂
You should also have measured the Voltage loss over the USB lead.
Also measure it with a scope on how clean the output is. I have 2 usb chargers which make my touchscreen on the Samsung S1 go crazy because of the noise.
Will putting a load on the two cell charger, switch on the boost converter?
That's a very cool review and update! I'd love to see more how bad quality USB cables affects the charging current, I've got a few different cables, even though my android phone says charging AC, they all seemed to perform differently! It'd be great if you can make a video comparing them, say with a fixed value resistor.
Thanks for this video! I'm actually looking for a decent 18650 cell power bank, since I now own a Nexus 7, and what a nice coincidence that you have the same setup! I'll probably be looking at that three-cell one. Thanks for your videos!