All Questions
27
questions
1
vote
2
answers
89
views
MCU not powering off completely
I implemented this on/off circuit that I use with a LiPo battery and a HT7833 voltage regulator. Since my MCU (ESP8266) can only handle 3.3v, I added a voltage divider for the MCU sense pin, just like ...
- 33
-1
votes
1
answer
62
views
Can I use this battery for my circuit?
I plan on having a circuit that connects a 3.7v Lipo battery to a 1.4 ohm coil.
However, I just saw this table for the battery I am using and noticed it has a max discharge of 0.4A
Does this mean I ...
0
votes
1
answer
76
views
LiPo battery choke and cutoff momentarily when connected to heavy load
I bought a couple of this lipo batteries it outputs a 4.2 V when fully charged nicely but trying to use it with coreless motors that draws about 3 A of current each, the battery just gives a surge of ...
- 498
0
votes
0
answers
155
views
Linear regulator to step down voltage from 3.7V to 1.5V
I have a coreless drone motor that connects to power through MCP73833 that connects to a 3.7V LIPO, but the motor is too loud so I want to reduce the speed a little. I figured, the easiest way to do ...
- 881
0
votes
0
answers
56
views
Combine power from power supply and LiPo battery
I am working on a hybrid electric power system project which currently has a 300W power supply and a 2S-910mAh LiPo battery. I would like for both sources to provide power if the load demand exceeds ...
- 1
1
vote
0
answers
782
views
Resistor value to discharge the battery
I had a LiPo battery with specifications of 14.8 V, 2200 mAh, 23.6 Wh with 25 C rating.
Can any one tell me how to calculate the resistance value.
Current= 25C x 2.2 A= 55 A
Power P = VI = 14.8 V x 55 ...
0
votes
0
answers
578
views
Battery Protection IC With NTC Thermistor
I have a battery design which is failing EN 62368-1 for thermal cut-off on charging conditions. IE. at the maximum temperature, charging currents need to cut off at maximum temperature.
I am looking ...
- 1,907
0
votes
2
answers
2k
views
Balance charging and protecting 4s LiPO battery pack
I'm planning to use a 4s 18650 LiPo pack to power a portable speaker and I'd like to include a charging circuit, so I don't rely on an external balance charger. I currently have it hooked up to this ...
0
votes
2
answers
2k
views
tp4056 power consumption
I have replicated the li-po battery charger with the famous TP4056 , the protector DW01A and the mosfets FS8205A... exactly like the comertial board.
I design a board that contains this circuit (and ...
- 11
0
votes
1
answer
178
views
Battery connector and wire ampacity
I’m considering using a JST ACH connector with my LiPo, but I don’t understand whether the current rating on the data sheet is for aggregate or for each wire individually (which is my guess since they ...
- 397
0
votes
1
answer
359
views
I need 5v@500mA to 12v@5A for 2.5 seconds every 5 minutes
I've run into quite the problem. I have a load that requires 12v@5A for under 2.5 seconds. However, my supply is a USB 5v@500mA. This is not an immediate load. The load will only need to be activated ...
- 713
1
vote
2
answers
1k
views
Can you discharge a 3s LiPo battery from both its main plug and it’s balance plug?
So I’m building a quadcopter, and I want to be able to use the same battery to power both the escs and the flight controller.
However, the escs are connected to the PDB which is connected to the ...
0
votes
2
answers
444
views
What is the difference between load testing and discharging a LiPo?
I would like to test max discharge rates for 1S (200 mAh) LiPo's. But I can see three ways of doing it:
Using a charger, discharge at highest rate and see how high the battery goes.
Using a resistor (...
- 125
1
vote
1
answer
288
views
AXP209 : Usage without ACIN?
I'm currently bulding and Android device and I've got a question which can't get answered.
The AXP209 is an IPS and power manager. It allow the usage and charge of a standard lipo.
It has two inputs ...
- 331
0
votes
1
answer
65
views
Stepping down voltage
I have a LiPo that is 1800mAh,25C,11.1V. it can supply a current of 1.8*25 = 45A. I need a current of 3.5A to drive a LOAD(a Nichrome wire of length 5-6cm) and 7.4V. How do i proceed with this ?
I ...
