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Significant information’s in favor of a professional Workshop => All about NiMH and Ni-CD chargers in European Union => Topic started by: Kiriakos GR on November 22, 2025, 09:15:54 AM
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This topic it is going to explore and discover recommendations alone.
Any sort of USB powered charger, this require an external power supply (wall block) with input voltage 120~240AC.
Battery charging this takes many hours, and its impractical to use your personal computer USB ports as an power source.
In theory, when a USB powered charger this comes with two connectivity options, Micro-USB & USB Type C, we speculate that this serving compatibility alone.
In simple words, we can use of what ever we have or own, as 5V USB power source.
In practice, the compatibility between 5V USB powered products this is a complicated topic.
Branded and reliable mobile phone chargers, they do not deliver more than 500mA without out additional identification, of the connected device.
Yes this is a safety feature, mainly to protect 5V USB ports over a laptop and or at desktop PC.
There is a thought this puzzling my mind.
I have on mail, my first USB powered NiMH charger, European Import, from a NiMH batteries distributor.
Input specification
Micro-USB : 5V DC 1A
USB Type C : 5V DC 2A
This charger supports as maximum, the delivery of 300mA at four 1,5V slots (AA Battery).
In electrical terms, we have an total DC current of 1200mA at 1,5V = 1.8W
This rabbit hole it gets even deeper, with out of us having awareness of the actual DC/DC buck converter losses rate at energy conversion.
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A new pack of questions, about such REAL USB powered NiMH chargers ( No Aliexpress fake toys ).
Do these support also communication protocols, so the mobile phone chargers, them to aloud a higher delivery of DC current?
With out actual electrical measurements, we cannot know, of how smart our New USB battery charger this is designed to be.
The only safe as first advice, we need to use an oversized 5V mobile phone charger, so this to operate at low temperature for at least 10 hours or so.