Questions tagged [battery-charging]
Please specify the battery type in your question. Include chemistry (e.g. lead-acid), voltage, number of cells and how they are connected (series or parallel), capacity (in A·h or W·h).
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2answers
82 views
Please check my solar outlay for Lithium ion battery
I'm in the processes of 'solarising' my electric bike, and would appreciate a more experienced opinion on how I intend to do it.
The motor is a 350W running off a 36 volt battery. I intend to get ...
0
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1answer
44 views
How can I limit the current drawn by a Li-Ion battery pack BMS?
I have a Li-Ion battery pack made with twelve 18650 in a 3S4P configuration, using an off the self Battery Management System (rated for 25A), that I purchased on aliexpress. I tried to charge it using ...
0
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0answers
29 views
Appropriate Battery [closed]
I am currently developing a device that requires 5+ A current load at 12V. Now, I want it to be portable and rechargeable. What appropriate battery should I use taking into account the:
a) ...
2
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2answers
57 views
Charging a Li-Po with a solar panel
I'm looking to setup my e-bike touring bicycle with a solar outfit so that it can charge on the road, but am unsure of the electronics. I appreciate the size of the panel will be huge, but this can ...
0
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0answers
8 views
Charging DJI's batteries with USB PD
I want to charge DJI's batteries from USB TypeC PD charger.
The charger can provide 60W output on its USB PD port. I'm planning to use an USB PD module (which gets me the 15V output from this PD port,...
0
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0answers
13 views
BMS for 2S Lipos
I have 2 lipo batteries in series, each has a built in protection circuit and these specifications:
Voltage: 3.7 Vcc
Capacity: 1000 mAh
Maximum discharge rate: 2100 mA
I need to charge them, but I ...
0
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0answers
15 views
Combining power input and USB data port for a Raspberry Pi Zero (W)
I am attempting to design some peripheral circuit around a Raspberry Pi Zero W for a portable project. It will be powered by a lithium battery. I want to bring out the USB port of the Pi; I also ...
0
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0answers
32 views
12V Lithium Ion Polymer Battery
I am trying to develop a product that requires a 12 V portable rechargeable battery that can output at least 2 A. Since conventional LiPo battery runs only on 3.7 nominal voltage, is it advisable to ...
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0answers
66 views
Creating a 3x18650 cell pack in series with 4 in parallel
I am going to create a 3S4P pack with some 18650 cells that I got from some lightly used laptop batteries.
Using: 8x Samsung ICR18650-22E and 4x LG LGABC21865
After doing some research I found that ...
2
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4answers
154 views
How would you wire small computer to run on both batteries and AC power? [closed]
I'm trying to use a motherboard (Mac mini 2018 model) for a project that will require it to be able to run off batteries. The project is essentially building a custom laptop using the Mac mini mobo ...
0
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3answers
63 views
How to use a gas gauge?
I must have missed an article, lesson at uni, or something obvious because I'm struggling to work out how to write some firmware to use a gas gauge to get out a rough percentage of battery remaining, ...
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0answers
25 views
Constant charging and using power from battery
I am working on DIY project using wind turbine.
I currently have a wind turbine setup with voltage regulator connecting a series of LED lights. As you guessed, the lights are not always turned ON and ...
0
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1answer
93 views
Boost converter from 0.3 V to 12 V
This query is for a college project.
The Source can give 0.3 V to 0.8 V.
Need to boost the voltage to 12 V, so 6 x NiCd batteries can be charged through LM317 CC charger.
The converters available are ...
2
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2answers
60 views
Lithium Ion Battery and Warm Circuit Board
I’m curious if I have a legitimate concern or if I’m just being overly paranoid.
I have a rechargeable Lithium-Polymer battery (prismatic shaped) rated for a max charging temperature of 45 °C.
The ...
0
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6answers
133 views
How would one go about using a 46V DC power source to power something which needs 36V DC using resistors? [duplicate]
How would one go about using a 42V DC power source to power something which needs 36 V DC using resistors?
2
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2answers
60 views
Lead acid battery increasing current under constant voltage
I've found an old lead-acid battery and decided to check if it still is in a decent condition. I've opened all rubber caps and checked that the water level was still OK. It measured 10.5 V before I ...
0
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0answers
10 views
Double A battery & lithium battery charging way
I do have some question regarding the charging input for nimh double A battery & lithium battery.
Is it possible for my 7.4volt lithium battery charged with 8.4volt 2Ampere charger?
Any idea on ...
1
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1answer
78 views
Arduino PSU with battery backup (SLA) and mains/battery monitoring
Please could somebody review my following schematic, as it is my first attempt at a PSU circuit. The aim of this circuit is as follows:
I am using a 15V (150W) PSU to power an Arduino, 2 separate 12V ...
0
votes
1answer
49 views
Battery charging over USB-C (using USB-PD?)
I'm designing my first PCB, a wireless Keypad/Macropad with a battery. I'm probably going to be using a 2Ah Li-Ion battery because there will be a lot of LEDs on it and I just want it to last longer ...
3
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2answers
395 views
Replacing NiMH with Li ion [duplicate]
I have a rechargeable vacuum cleaner with NiMH batteries, 1800mAh and 14.4 volts, 12 cells. The charger is 18v 200mA. The batteries have now died.
Can I replace the batteries with 4 cell Li-ion in ...
0
votes
2answers
42 views
Why would a BMS (or other circuit) have reduced voltage after a short?
I have this 9Ah 42v battery pack protected by a BMS wrapped in a shrink which I would rather not disassemble (so I don't currently have access to BMS' circuit). It has two wires for charging, and two ...
1
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2answers
85 views
LM741: voltage comparator Issue
I'm working on an automatic battery charging source switching between solar power and a 24Vdc wall adapter.I'm using a LM741 as voltage comparator and a relay for power switching. Basically, if solar ...
1
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2answers
59 views
How to add 0.2V per Ampère that device draws? (Voltage drop compensation)
I have noticed that many mobile phone chargers already do this: For each 1 A of current that the mobile phone draws, the charger's output will be increased by 0.05V or 0.1V or something similar, to ...
0
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1answer
56 views
how the battery behaves in this diagram
My question is this. I'm using this ic mppt SM72445 along with a 250 watt solar panel, mppt output configured to 50.4 or 51 volts, 12-cell lithium-ion battery pack and bms, if the load is less than ...
0
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2answers
64 views
how a battery behaves in parallel to the charger with a shared load but with a voltage difference
how the battery behaves in this diagram
how a battery behaves in parallel to the charger with a shared load but with a voltage difference
0
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0answers
24 views
BQ2002, LM317 NiMH charging circuit. How to control the current output?
I have designed a charging circuit utilising the BQ2002 and LM317 for 2x 1.2V NiMH batteries, and it is to be charged using a 5V USB input, I need the output current to be between 550 mA and 1A. I ...
6
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2answers
219 views
Can the negative impact of mixing new and old batteries be mitigated?
Mixing old and new batteries is bad.
But there are various options how they can be mixed, and I guess there are use cases in which certain ways of mixing can be justified.
In my off-grid solar ...
-1
votes
1answer
31 views
Using a 7.4 V LiPo Battery for an Arduino Feather 32u4
I am working on an Arduino project at the moment, with the following board:
Adafruit Feather 32u4
And it says I need 3.7 V of LiPo to power it.
However I also have a valve that I want to open and ...
0
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0answers
33 views
BMS for 12v Lithum battery pack
i am making a 18650 battery pack with a configuration of 4x3cells for 12v. i am using these cells, https://liionwholesale.com/products/samsung-inr18650-25r-battery-genuine-tested-20a-2500mah-flat-top-...
0
votes
1answer
61 views
BQ2002 NiMH Charging Circuit not working
I have the following charging circuit based on the BQ2002 which will charge a NiMH battery using a 5V micro USB cable. I built the circuit already and noticed that the TIP32C is not getting hot and ...
0
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1answer
17 views
MP26029 Battery Charging IC OTP issue
I am working on this battery charging IC MP26029, it has OTP Funtion (One Time Programmable). But i do not know how to program this IC, as there are no Uart or I2C pins available. Does any one know ...
0
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3answers
28 views
Balanced Charging of ZOP 2s lithium ion battery
Good day everyone,
I recently purchased a “ZOP Power 7.4V 2200mAh 2S 35C Lipo Battery T Plug” for a project. I have designed a circuit to charge the battery, but now I am wondering if it is necessary ...
0
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0answers
24 views
Charging multiple batterypacks in parallel
I am sorry if this questions seems kinda basic.
I am currently working on a small project involving a bluetooth amplifier module requiring a minimum of 12v input.
My idea was to use a ...
0
votes
1answer
71 views
How to unite three different batteries in to one powerbank [closed]
I'm absolute beginner in electrical engineering and I need help in building a powerbank using three different batteries with different characteristics.
I have a sudden passion to implement this ...
-2
votes
1answer
41 views
DC-DC charging different voltages
I have several banks of batteries on a boat, two larger banks
48v electric propulsion system with regen
12v house bank
Each has a charging source the 48 has regen up to 2kw while sailing
The 12 has ...
0
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1answer
74 views
Switching between two completely independent circuits
Background: I have built a 2S 7.4V battery out of two 18650 batteries. I have some TP4056 (5V 1A Micro-USB) charging modules lying around. I would like to use these the TP4056 modules (one per 18650) ...
1
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1answer
86 views
Why does my phone pull less current from power bank when the screen is on? [closed]
While charging my phone (a Samsung Galaxy S5) with a power bank that displays the power output with 0.1 W resolution, I turned the screen on. To my surprise, the power pulled by the phone went from 7....
0
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0answers
40 views
Problem with MAX1645B test circuit?
Please consider the schematic:
The MAX1645B is a level 2 battery charger.
My problem is with the P-Channel MOSFETs.
There are two P-Channel MOSFETs in the above circuit.
From the datasheet:
...
0
votes
1answer
32 views
PV battery connection
1)What happen if a PV array of 30 Vmp is connected to a 12 volt battery(lead acid)?
2)Do i need a buck converter to 12 volt between the pv array and the battery to connect them together?
0
votes
1answer
83 views
Solar charge set up damaging battery?
I've installed a 12V 80W solar panel plus controller and attached it to a 12V 105Ah leisure battery. At first it (appeared to?) work. The charge status on the solar charge controller was at max and it ...
2
votes
1answer
65 views
How do integrated charger ICs dissipate differences in VCC and the battery voltage?
I was looking at a couple of charging ICs (BQ2002 for instance) and some of the fast charger ICs can charge up to 2A whilst running of a 5v supply. In this case charging a empty 1v NiMH cell means ...
0
votes
1answer
27 views
li-ion battery managment system, cell protection difference?
Could you help me to clear up what the battery management system/BMS adds to cell level protection, what is the difference? I assume that if I have many cells in series if I only have cell protection ...
0
votes
0answers
37 views
Charging Phone with a Modified Power Supply [duplicate]
I have converted a computer power supply into bench top power supply and I am now ready to add some USB ports to charge various devices. On the power supply label it shows the 5v rail is capable of ...
1
vote
2answers
54 views
Replace 3.7V flat tablet battery with a 18650 cell
I am building a device using cheap Chinese tablet. One of the problems I have is weak built-in battery. I'd like to replace it with a few 18650 cells.
As far as I know, 18650 cell can be charged up ...
0
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0answers
55 views
Minimum current to charge a 5v device? [duplicate]
I'm trying to use a DC-DC converter to charge a mobile phone.
This is the converter....TRACO 12v-5v converter
The converter is relatively low power, (5w) and can supply a maximum of 1amp. Testing ...
0
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0answers
102 views
AC water turbine
I am trying to use a water turbine from China to charge a lithium ion battery. The water turbine is rated to 10 watts.
I figured that should be enough to charge the battery but I can only ever get ...
-1
votes
1answer
33 views
How should a load be connected in a configuration of a MPPT solar charger and a LiPo battery?
I am designing a circuit for MPPT solar charger SPV1040 which could charge a single-cell LiPo battery. I am using AN3319 and AN4050 application notes for reference.
I also want to connect a load ...
1
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2answers
86 views
Buck converter for Li-Ion 2s battery charger
I'm currently doing a project that requires the charging of a 2s Li-Ion battery.
I have an 18V 10W solar panel that I want to charge my battery using a buck converter. Im controlling the switch and ...
0
votes
2answers
52 views
MPPT lead acid over voltage
As I understand it, an MPPT algorithm adjusts the charging voltage until it finds the point where maximum power is delivered into the battery. If a 12V lead-acid battery is used, is there an upper ...
0
votes
3answers
123 views
Why doesn't the voltage drop across the resistors of my battery charger follow Ohm's law?
Here's the setup, the three items below are in series:
Battery at 215V
Power supply at 250V (It is a 5A constant current power supply that will drop voltage down to 200V minimum before failing)
8 ...
