USB Charge/Recharge


Resident Curmudgeon
Senior Team
Premium Member
In my bathroom, I have two cordless devices that charge via USB.

On the first, the LED blinks to indicate charging and is solid when fully charged.
On the second, the LED is solid when charging and blinks to indicate fully charged.

Which is more correct and why? There may be no wrong answers, but two similar devices that work exactly backward from one another has to be some kind of wrong, right?


Well-Known Member
Are the devices just "similar" or are they identical? (Same mfr, same model?) If the latter are they different software versions? I've never heard of an industry standard for indicating "charging" vs. "charged." And, yes, it would be nice if there were--just pick one & stick to it!


Well-Known Member
Fight Leukemia
Maybe one of the devices doesn't like the GFCI circuit it is plugged into?


Well-Known Member
I prefer Red LED for Charging, Green for Charged, Blinking for Something is wrong.

If only one led is available, then my vote is blinking = charging Solid = charged.

blinking when charged is just wrong.

I'm very strongly in this camp. Blinking either means that things are happening or that something is wrong. Solid is completely acceptable for finished. Incidentally, that's how all my power tool batteries charge, in addition to color to help indicate if there is a fault.


Sr Product Manager, Chauvet Professional
I'd go with Solid green for "GOOD".
Blinky green for "getting there".

Which... is exactly what my toothbrush does... so, it's cool.
That said, my toothbrush rarely goes for more than a few days without getting dropped back on the charger, so this is mostly moot.

I agree that blinking implies that something is happening.

What I really like is the tools with the bi-color (RG) color indicator too. But you don't often see these in your bathroom...
Red: low power (below 30%)
Red Blinking (FAST): charging error/problem.
Red Blinking: low power, charging
Yellow: med power (between 30-70%)
Yellow Blinking: med power, charging
Green: full power (100%)
Green blinking: charging (over 70% not full), almost full power.


Well-Known Member
Canon charger we have does one blink for charge is less than 25%, two blinks charge is between 25-75%, three blinks 75+ but not fully charged, steady on for complete.
Yes I love this too. Brilliant use of simple tech.
My dewalt drill battery charger is the crazy one.
Solid red and green means charging, flashing green means standby. Became so annoying because the green LED is so bright, I thought a party was going on when I turned out the lights and a wall full of chargers were flashing. Now they're on a power strip with a switch.

Users who are viewing this thread