I have two power strips connected in serial. It is wall->strip A->strip B.
I have two Huawei cell phones, different models. When I plug phone A to
strip B, the phone can charge. However, if I plug phone B to strip B,
after overnight, the battery capacity is still zero (zero to start with).
If I plug phone A or B to strip A, it can charge.
strip B can charge only phone A but not phone B.
strip A can charge both phones.
Any explanation to this mystery? Thanks.
On Saturday, July 25, 2015 at 2:23:20 AM UTC-4, yyy378 wrote:
Typically when charging phones have an indicator light or icon
that shows it's charging. What does that show? I assume you've
verified that other loads will work when plugged into B? Tried
different receptacle spots on B?
charging. However, after charging overnight, the battery still shows 0%
and when I unplug the phone, it quickly goes dead.
When I use the same charger on the same strip B, same spot, to charge
another phone, the percentage does go up, meaning it is actually charging.
Sounds like a dead battery in phone B. The indicators are often based on
voltage and batteries can show good voltage under very light loads (like a
metering circuit) but not have any real power to deliver when put under a
Did it fully charge that battery, i.e. did it stay on for long after it was
charged in strip A? Are you sure you're getting full power out of strip B?
Did you measure it with a voltmeter?
Plugging in an unpowered charger into a device like a cell phone can give
some squirrely results, at least based on what happens when the power fails
in my house when the phone, laptop and a bunch of other gear is being
One last question - are the plug blades on the charger polarized? I can't
remember what allegedly unpolarized device I had that would not work
correctly if it was plugged in upside-down (relatively speaking).
Other than that, I'm officially out of ideas. Sorry I couldn't help. I
bought a USB charge monitor (and lots of adapters) so I could monitor the
current flow into the device being charged. Helpful in situations like this
and only cost $6. To diagnose this problem correctly I'd use those along
with a DVM to measure the voltage at strip B. But remote diagnostics on a
text-based system where you can't even draw a sketch easily - yes, I give
I would recommend getting another power strip and seeing if it exhibits the
same characteristics as the one you have now.
Even quicker. I've found that power strips, particularly ones with filter
circuits, can interact with each other. I've had some that block X-10
signals and it doesn't matter if A goes to B or B goes to A.
As I said to Trader, I am bowing out. Too many red flags and not enough
interest, I guess. Without the proper tools on the OP's end like . . .
https://www.adafruit.com/products/1852 (USB Charger Doctor - recommended to
me by someone here and INCREDIBLY useful for such situation. It tells you
what voltage and amperage is actually reaching the charger. It's only $7.50
and no one who charges anything by USB should be without it.)
. . . there's going to be a lot of tail-chasing for little long-term or
useful edification for me, anyway, because if I had such a problem I'd put
the Charger Doctor on the case (no financial interest - just a very happy
customer who saw similar items selling for $75.)
In alt.home.repair, on Sat, 25 Jul 2015 17:18:04 -0400, "Robert Green"
I love gadgets like this, but how often do such situations really occur?
Even in this case, I assume the OP is only academically curious, and
that his practical problem is solved by using strip A, and that he knows
I want you to convince me to buy this, but then I see
plus xxx for shipping. SHIPPING (CALCULATED IN CHECKOUT), I hate
that., Sure enough, they want my name, email, address, and PHONE
before they'll tell me the shipping cost.
And then I see these and wonder if I shoudl buy these too!
USB Micro-B Breakout Board
Simple but effective - this breakout board has a USB Micro-B connector,
with all 5 pins broken out. ...
USB Cable with Switch
Add a power switch to any USB-powered project simply by plugging this
between the USB power port and ...
$2.95 Is unplugging just as good as using this switch?
Wow. Okay the price is great, but do you really use it?
Perhaps but it means less wear on the connectors which aren't as robust as
they should be. Not something I would buy - well, maybe. I avoid
over-taxing frequently used USB connectors by using short extension cords.
This because I once plugged in a USB cable into an OTA DVR and push the USB
jack right into the chassis. Not well anchored, as you can imagine. Effing
up a USB port on a table, phone or laptop can be a real PITA and expensive
Yes. All the time. I have a few of them (got them with free Amazon Prime
shipping but that URL was WAY too long to cite). I have them attached to my
main phone charger and on the PCs I use to charge oddball items like
cameras, MP3 players, etc.
They are good for telling when you're overloading your USB ports, too.
Revealed that a Sansa clip player's battery was going bad because it was
drawing way more current than before. It's helpful if you use it to take
baseline measurements of chargeable gear so that you know what it should be.
It also tells you how much juice your chargers can output (varies greatly)
and if they're really within specifications. You'd be surprised at how many
cheap Chinese chargers don't even meet the USB spec and are over or
undervoltage by more than 2 volts. Also tells you the voltage under load as
well as the amps being drawn by the chargee. (-:
In alt.home.repair, on Sat, 25 Jul 2015 23:02:32 -0400, "Robert Green"
Okay, you've convinced me.
The breakout board is cheap but I'll probably never use it, and I could
make one from the bad flashdrive I have.
The cord with the switch might be useful and it coincides with my fetish
for adapters. i once tried to attach a switch to the flat grey indoor
telephone wire that went to a headset, so I could answer the phone with
it. Boy, was that hard, and when I was done, it was fragile. So
maybe I should buy this.
As to shipping Mr. Monster, I barely know what to do with it, so quick
shipping is not much of a plus. And Amazon has probably lost a customer
since I've bought everything I need, practically, and the 35 dollar
miiniimum is much harder to meet than $25 was. And membership, I'm not
going to spend money to spend money. Save hundereds their new
competitor, Jet says. That would require spending thousands, and I
might spend 100 at most this year at places like Amazon or Jet.
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