All Questions
26
questions
0
votes
1
answer
49
views
How can the voltage of the original battery differ so much from the voltage of the original adapter?
It's about Xiaomi Mi Notebook Pro 15.6" 2019 JYU4148CN.
The original battery has a voltage of 7.6V and a current of 7.9Ah, the total Capacity is 60,040 mWh.
The original adapter has a voltage of ...
- 101
2
votes
1
answer
153
views
What is the name of this battery connector?
What is the name of this battery connector?
This is the link to the battery itself.
- 123
1
vote
1
answer
100
views
Battery replacement for 16 VAC
I have a mains power adapter that powers a small model train set. I would like the option to power this off a rechargeable battery, although I'm not sure this is possible, as it uses AC.
My current ...
0
votes
1
answer
70
views
Problem regarding clock stopping when voltage goes too high...?
I have a peculiar problem, that I can't explain.
The thing is, I have a clock where I have installed light so it will light up when it's dark in the room. This works fine, it's feeded by an adapter ...
- 121
-3
votes
1
answer
367
views
Power adapter 12V for charging LiFePo4 12V battery with BMS with passive balancing
I have a project where I need to charge an Enerpower LIFEPO4 Battery of 12V 12Ah with BMS with an integrated passive balancer, protection against overcharge, deep discharge, over-discharge (...
- 5
0
votes
0
answers
99
views
Using a li-ion battery instead of an AC adapter
I have a board that uses a 19v 3.42A AC adapter as a power supply and I want to replace that with a Li-ion battery. What should the voltage of the battery be? I ask this because my laptop for example ...
- 1
1
vote
2
answers
268
views
Using a 100W External Power Pack to Run / Charge an Old 19.5v Laptop [closed]
I have just ordered the new Flash 2.0 battery pack. Specs are here, but briefly:
100W USB-C Power Delivery 3.0 Output: 5V/3A, 9V/3A, 12V/3A, 15V/3A, 20V/5A (PPS)
I've also got an old HP Pavillion ...
- 113
1
vote
3
answers
7k
views
Using a 9V battery instead of a DC power supply
I have a DC power adapter that has the following specs:
Input Voltage: 100-240V AC, 50-60Hz, 0.5A
Output Voltage: 9V DC, 1.5A
I am interested in taking a 9V ...
- 113
0
votes
2
answers
108
views
12 VDC battery supply with automatic 12 VDC adapter override
I am designing a 12 V circuit to provide 12 V DC (500 mA). I would like to have 12 V battery but also be able to plug in 12 V adapter to automatically override the battery without a switch and without ...
- 3
1
vote
1
answer
169
views
9V 1A adapter and 2*3.7V battery IRF9630 produce sound and gets very hot 9V battery not (metal detector)?
I am not an expert at electronics.I am trying to build a pulse induction metal detector. I have this circuit
from that Book
I am using it with stm 32 blue pill but I have to stabilize the 9v supply ...
- 164
0
votes
2
answers
103
views
What plug type is this?
I recently bought some LiPo battery packs from Ali,
Now im trying to figure out what type of plug it has!
Anyone knows the answer? Would be awesome.
0
votes
1
answer
92
views
Issues encountered when adding DC adapter to light powered by battery
I have an LED light bar powered by 6 AA batteries connected in series. There is also an RF control unit to turn the light on/off. The light eats through the batteries rather quickly thus I decided to ...
- 3
4
votes
3
answers
4k
views
Replaced 4x AA battery with 6V 3A DC adapter, but device won't work
I'm hoping you smart folks can help me. I'm puzzled by what I thought would be a simple DC battery to DC adapter swap.
The device I'm trying to mod is a a microchip activated pet door (SureFlap ...
- 41
0
votes
2
answers
2k
views
Simple circuit to detect ac power loss and use dc backup? [closed]
I want to make a simple circuit like those used in commercial emergency lights.
I would have a "walmart" AC to DC adapter powering say a DC light or two. I would like it so when the AC powering the ...
- 41
0
votes
3
answers
150
views
Is 19V safe for charge Ni-Cd batteries?
I have 5 Ni-Cd battery(1.2V 2200mAh). They connected in series. I have a 19 V 3.42 A adapter. Will it make a problem when I charge Ni-Cd batteries with my 19 V adapter? Is 19 V dangerous for charge Ni-...
