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Questions tagged [batteries]

An electric battery is a device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy.

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BMS-Battery System

I am facing an issue, I am building my circuit found below in the image, I am managing a battery pack using a BMS (link: https://eu.mouser.com/datasheet/2/389/STM_4_19_2023_DB4989rev1b-3159205.pdf) (...
Mohamed Smaili's user avatar
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Resistances to two batteries where the bat1_pos + bat1_neg = bat2_pos + bat2_neg? But, bat1_pos is shorter than bat2_pos

SOK makes a unit called "12-Slot Outdoor Insulated Battery Rack – Fits SOK & EG4 Batteries" In this configuration there are two batteries next to each other stacked six sets deep. Both ...
Evan Carroll's user avatar
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31 views

Current concept doubt (charging/discharging) [closed]

Current concept confuses me alot in electronics, have some questions regarding the same- Suppose my battery rating is 5V 1A (1000mAh) and suppose there is an Rpi to which i want to power and its ...
L Lawlit's user avatar
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1 answer
58 views

Why is this boost converter bypassed?

In my project, the input power of a device comes from a battery pack. Here it is: Here is a simplified architecture inside the battery pack: There is a charger that charges the battery when V_IN is ...
uz3il's user avatar
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1 vote
1 answer
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Step up lFP battery cell voltage - from 44.8v to 53v

I have 50 Ah cells LFP 3.2 V. I connect 14 of them in series - giving me an output of 44.8 V (nominal). I will use this battery pack to power an EV 2 wheel that requires 53 V to function. With a ...
Ameen Khan's user avatar
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2 answers
38 views

Boost converter two different voltages (9v/12v) from 3.7v battery, attach both to battery, or daisy chain off 9v

I'm sure this has been answered plenty before but I cant seem to get the search terms. I'm wanting to use a 3.7v battery to power a small 9v device and a 12v device at the same time using a boost ...
luminousfox's user avatar
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0 answers
56 views

Preventing current between batteries

I charge 2 lithium Ion boat batteries from a single solar regulator. I have the positive leads from both batteries in common to the regulator and charging is fine. But if charge current is low I want ...
George Losey's user avatar
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1 answer
45 views

Is a smoothing capacitor only useful when the trace has impedance

Under conditions where maybe a capacitor is used maybe when perhaps there's a high impedance power supply and the source would cause current surges, maybe a subwoofer to a car battery that can't deal ...
George kirby's user avatar
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1 answer
37 views

Reliable battery power converter for ESP32 [closed]

I have seen similar (but just similar) questions here, so I decided to ask anyway. What is a buck-boost module, preferrably from Aliexpress, that I can use to power an ESP32 with 3.3 V from a 3.7 V ...
Clóvis Fritzen's user avatar
4 votes
4 answers
794 views

Impact of high-power USB-C chargers on Li-ion battery longevity

Context: I have a 24 Ah 65 W power bank. I use a USB-A 5 W charger and it takes over 12 hours to charge it. Considering buying a more expensive USB-C fast-charger + cable, as this power bank can take ...
DansAltamira's user avatar
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4 answers
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Why is the power conserved in a phone charger?

Most phone chargers draw 220V 50mA (for example) from the socket to inversely proportional draw 5V and 2.2A (in its converter) to charge the phone at 2.2 A because power is conserved. Why is power ...
Moreless's user avatar
2 votes
1 answer
37 views

Recommended way of power switching external modules & peripherals

I recently designed a PCB that is battery powered. Ideally I want this to be a low powered device, and as such have endeavoured to implement controls and systems to decrease power consumption. My MCU ...
Explorex's user avatar
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4 votes
2 answers
2k views

Why does a battery have a limit for current in amperes?

I recently learnt that the voltage of the battery (for example, a 9V battery) is constant at their bounds, whereas the battery current depends on the load that is connected to it. If I connect a 12V ...
user381936's user avatar
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1 answer
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Grounding PV solar, battery and load

I have simple diy solution for solar system. The system is build using esp32, 2x ina266, ads1115 and acs758. The esp is powered from usb 5v (stepdown from battery) and 3v3 is then distributed into all ...
Peter Bašista's user avatar
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2 answers
64 views

Charging a battery using solar panels, and IV curve of the solar panel

I am aware that a solar panel has a fixed IV curve, and the load resistance can move the operating point of the solar panel along the IV curve. If a solar panel was used to directly charge a battery ...
siyunlee's user avatar
5 votes
1 answer
1k views

Why we can not recharge alkaline batteries to their former voltage values

When a 1.5V alkaline battery drops to around 1V, it is usually insufficient for the operation of most battery-demanding technological devices. Couldn't batteries that have fallen to 1V and are now &...
kaan's user avatar
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-1 votes
2 answers
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Why does a 230V 16A socket supply only the needed current to loads? [duplicate]

If I connect a 150W laptop charger to a socket that supplies at home 16A 230V, it will only draw the necessary amperage needed for the laptop charger at 230V. Why? Why doesn't my charger simply draws ...
John Mary's user avatar
-3 votes
1 answer
85 views

How a car inverter can diffuse 16 A 230 V if the input is a 12 V car battery? [closed]

I have found this car inverter We say that the power is kept between the input and the output of an inverter like in this thread, so if the voltage in the output is higher and stepped up, the current ...
John Mary's user avatar
7 votes
5 answers
1k views

Is There a Way to Connect Two Batteries in Parallel Without an Immediate Voltage Equalization?

I am powering a datalogger with a 12-V battery, and every week or two, I must swap out the battery. I'd like to be able to swap these batteries out without ever losing power at the datalogger. ...
David Moore's user avatar
0 votes
1 answer
29 views

Brown outs with Nordic Instruments PPK2 power profiler

I have a circuit that I know works with 2 AA batteries that are nearly dead (1.4 volts total). I want to measure the current consumption of the circuit using my Nordic Instruments PPK2 meter. The only ...
MattG's user avatar
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2 votes
1 answer
38 views

1 Cell LFP Battery Pack Protection

I am starting a project that requires a single 3.2V LiFePO4 18650 cell to be in a housing with exposed contacts, suitable for easy swapping in and out of an unpowered device. The device will only be ...
zambetti's user avatar
1 vote
1 answer
63 views

Finding the correct power input for a battery pack powered device [closed]

I want to find the correct input voltage and current a device needs so that I can replace its battery pack with wired DC power. I suspect it's what it says on the device itself and not on the battery ...
E-71's user avatar
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1 answer
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KiCAD gives error "Input power pin not driven by any output power pins" with VBAT connected to battery symbol

I connected VBAT to a battery symbol and battery to GND, but I still get the error "Input power pin not driven by any output power pins." What am I doing wrong? Schematic screenshot:
JustOneMan's user avatar
1 vote
1 answer
65 views

Can I replace a 12 V 190 Ah battery with two 6 V 200 Ah batteries in 48 V system?

The battery bank is made of 4 each 12 V 190 Ah AGM lead acid batteries. One died, and I couldn't find the replacement easily. Instead, I found some 6 V 200 Ah batteries. Could I hook them up and be OK?...
joo lee's user avatar
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1 vote
1 answer
148 views

How to prevent leaking batteries in multimeters

I'm having issues with leaking alkaline batteries in my multimeters (Fluke 17B and Fluke 325). The batteries were from reputable brands. I think the solution for this problem may pass by a periodic ...
AmssmA's user avatar
  • 508
3 votes
2 answers
179 views

18650 battery holder corrosion

I'm using a Keystone Electronics 18650 battery holder #1043, link below. The connection between the cell terminals and the battery holder seems to have what I think are slight corrosion issues. I take ...
tomdabom's user avatar
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1 answer
30 views

Checking battery capacity of 7 amp 12 volt AGM batteries for UPS

I have several 1000 watt Triplite sinewave UPS. The batteries had a date code of 2021 and testing with an 800 watt resistive load ,two heat guns,I was getting around 3 minutes run time,specs state ...
Tom Schulze's user avatar
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0 answers
29 views

5v DC battery backup circuit

I am trying to design a backup battery circuit with a power input from a motor generator, and I have come up with the circuit below, For now I am unsure of the best option to deal with any excess ...
yusuftm99's user avatar
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0 answers
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Periodic Voltage and Current Fluctuations in Autonomous Robot System

I have an autonomous robot system powered by a 24V LiFePO4 battery that has several distributed PCBA's getting their power from the 24V battery, and also having their own on-board DC-DC buck ...
Sam's user avatar
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1 vote
1 answer
83 views

Can PE and GND be the same for HY2112 to Function?

If C1 is connected to GND instead of PE, will the HY2112 device fail to disconnect the battery? My understanding is that HY2112 (similar to DW01A) measures cell current using R2 as a shunt. If OC for ...
sdolan's user avatar
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0 answers
38 views

Switching between two power sources and charging a battery pack

I am designing a circuit, which can use either the power from the normal socket (230V) to charge a battery pack and power a arduno uno R3 at the same time when a spst switch is on. When the switch is ...
Mario Gabriel Radu's user avatar
0 votes
1 answer
41 views

Swinging Magnetic Attracted to Batteries [closed]

I have a pendulum in which the Bob is a permanent magnet. The circuit and batteries are hidden inside the base. The problem is that the permanent magnet is attracted to the batteries and slows the ...
Wylie Wisnewski's user avatar
3 votes
5 answers
3k views

Will this short circuit to turn off an LED drain the battery?

The above image is of a small little box I'm working on; I want an LED to turn on while the box is open. I've made this small circuit and in theory it should work perfectly, given that electricity ...
Gijahara's user avatar
0 votes
1 answer
120 views

What is the difference between a 225j 400V capacitor and a 105j 400V capacitor? [closed]

I am trying to build an AC to 12V 1A DC power supply.
MMNZ's user avatar
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1 vote
1 answer
50 views

Earth protection in PV + battery system

I'm building a system that looks like this: PV -> solar charger (48 V) -> batteries (48 V) -> isolated DC/DC (48 V->12 V) -> non isolated DC/DC (12 V->3 V) -> load The PV's are on ...
user362085's user avatar
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0 answers
27 views

How to calculate the capacity from a given list of currents,RelativeTime and Time which are obtained through experiment?

I'm working on machine Learning Project to build a model that predicts Remaining useful life time of a battery using NASA dataset which consists data of four 18650 batteries (identified as RW9,RW10,...
GMI's user avatar
  • 1
8 votes
4 answers
2k views

Why does this battery use 4.2 V when its nominal voltage is 3.7 V?

I changed my headphone power circuit and I noticed it was using 4.2 V to charge a 3.7 V battery. I am confused why it is using 4.2 V. I know to charge a battery you need more voltage than its rating, ...
Ray's user avatar
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0 votes
1 answer
55 views

DC power out projects from laptop batteries

I am aware of existence of SMBus signals on the battery connector and the dialog between battery and computer, to supply and charge However, I am only interested in the DC supply from the battery and ...
Daniel Perez's user avatar
2 votes
1 answer
126 views

Battery performance at high altitudes

I want to install large Li-ion battery containers along with Power Conversion Systems (PCS) of 50 MWh scale at an altitude of ~4000m. But my battery/PCS manufacturer has specified altitudes of <...
санкет мхаске's user avatar
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0 answers
36 views

Is a Voltage Sensitive Relay (VSR) inherently flawed?

A VSR is described by Jaycar: This device will allow two batteries to be charged from your engine alternator at the same time. When your engine is on and the start battery is sufficiently charged the ...
Ken Mercer's user avatar
2 votes
1 answer
65 views

How to turn a home battery on or off based on net voltage [closed]

sorry in advance for this probably trivial question. I'm not much familiar with EE yet. My parents are running a farm in the Netherlands, but during milking in winter, the voltage gets so low that ...
RikH's user avatar
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0 votes
1 answer
31 views

Lithium polymer battery size versus energy density

I am building a small device that needs to use a rechargeable lithium polymer battery. The dimensions I am looking for are 351125 { 35 mm (H) x 11 mm (W) x 25 mm (L) }, which is the standard way these ...
Sreenivasa Chary's user avatar
0 votes
1 answer
43 views

Does this battery pack allow load sharing setup?

I would like to use a pre-assembled 12V-rated LiFePO4 battery pack such as the one advertised here. Due to nature of intended use I'm currently focusing on a charging setup where the load is connected ...
lucenzo97's user avatar
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1 vote
1 answer
51 views

What ways can I test an NiMH battery aside from capacity

In my current job, I take used prius batteries and recondition them. I put them on RC chargers and the modules through charge/discharge cycles to both measure and raise the capacity. They have an ...
crispYpickle's user avatar
0 votes
1 answer
39 views

making a long lasting battery pack for 24V/0.5A

I brought a stereo equipment from Japan that uses a wall-wart set at 24V/0.5A. I would like to replace the PS with a long-lasting battery pack, but all I can find are 12V/5A batteries, or 24V/5A. I do ...
Reimar Bruening's user avatar
0 votes
0 answers
50 views

Electric bike battery shutdown under load

I have built a custom electric bike with the following components from Amazon. 48 V 25 Ah Battery Pack 48 V 1000 W Brush DC Motor 48 V 1000 W Controller The problem is the bike "shuts down" ...
Josh Kropf's user avatar
2 votes
0 answers
108 views

Powering a microcontroller with an Li-ion Battery --> How to choose a protection?

The introduction I'm currently working on a low power project that is using the ESP32-S3 microcontroller variant from Seeed Studio, the XIAO Series ESP32-S3 (Official wiki: https://wiki.seeedstudio....
Benjamin's user avatar
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0 answers
39 views

Replace battery by DC source (USB 5V)

I bought a Bluetooth audio receiver which is powered by 3.7V Li-ion battery. I tried to replace the battery source to a USB 5V with a buck converter and I managed to achieve it, here is my work around....
許書和's user avatar
1 vote
1 answer
42 views

Creepage and clearance in a dielectric fluid

I'm designing a DC low voltage system ( 1000VDC) with immersion cooling. I have been referring to EN 60664-1 to size clearance and creepage distance, but this standard is ok for air only. Is there any ...
PatAll's user avatar
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0 votes
0 answers
32 views

Problem estimating LiPo battery life for powering BLDC motors

I'm trying to estimate the battery life for a system powered by a pair of LiPo batteries, in which the main loads are two BLDC motors. I estimated the battery life by dividing the battery capacity by ...
SkepticMind's user avatar

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