12
votes
Accepted
Power bank or fire hazard?
Those are a fire hazard. Even if someone can sell something, it does not mean it should be sold.
I recall seeing a picture of similar device that had melted itself. What likely happened was bad ...
- 138k
5
votes
Accepted
What is the function of the second MOSFET in this lithium-ion battery charger circuit?
You're right that M2's body diode passes voltage through, but it has a voltage drop of typical -0.7 V and max -1.2 according to the datasheet. Instead of having the diode turn current into heat when ...
- 1,591
5
votes
How do I charge a 4-cell Li-ion battery pack?
Do I have to design my own battery-charging PCB? Or can I just apply, let's say 24V?
Neither.
Buy a ready-made 4S Li-ion battery charger (14.8 V nominal, 16.8 V constant voltage, and no more than a ...
- 18.9k
3
votes
Accepted
Less than minimum charge voltage for NiMH battery and extra parts in a "simple" circuit
Update & Supplement #2:
I found other information here in the EESE site and in Linsen’s great “Handbook of Batteries” that supports my original answer, but I felt the need to clarify and update ...
- 1,479
2
votes
Accepted
18V battery charger showing hazardous voltage symbol on Fluke multimeter
I assume you set your Fluke87V to autorange. This means the 87V internally switches between ranges to find the correct range for your measured voltage. The switching process isn't very fast. DC ranges ...
- 599
1
vote
Accepted
High voltage at the Schottky's anode terminal (Hobby Li-Po charger circuit)
Look at Fig.2 in the Diode's Datasheet (Typical reverse Characteristics).
25µA reverse leakage are exactly in spec for the Diode.
- 599
1
vote
I tried charging my earbuds with OTG on a USB type A to A cable. But it got damaged. Why?
Fixing consumer electronics without knowing enough about subject is off-topic here.
However, here's an explanation of what happened. Your earbud charger is now damaged because you used a non-standard ...
- 138k
1
vote
Accepted
Charging LiPo Battery with Solar Panel and Water Turbine Generator
You have three separate things to accomplish here:
Solar panel MPPT
Combining sources with different voltages
Battery charging
There are plenty of ICs out there that charge batteries from solar ...
- 16.3k
1
vote
Accepted
5V USB-Power without Battery makes MCP73832T toggle the LED
Most likely C2 is the problem. When the battery is not connected, the MCP wrongly thinking there's a battery due to C2, so it drives Stat low (turning the LED on) then it very quickly charges the ...
- 2,090
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