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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1answer
34 views
Modifying a chip on a bought voltage measurer
I have bought a battery checker for my RC LiPo battery packs. The battery checker can measure and alarm at low voltages between 2.7 and 3.8 volts, however with LiPo batteries, the interesting range is ...
0
votes
1answer
47 views
Proper resistor for simple circuit
I have a potentially stupid question, but I have no idea how to handle the problem. I want to use 9V battery with a diode that requires 5V. So I need a resistor. How do I find the resistance if (as ...
0
votes
1answer
24 views
Finding batteries to make a stable 12 V battery-power supply
I want to make a stable 12 V battery-power supply for RPi and LED matrix. Schematic is something like:
...
1
vote
3answers
77 views
Sensor scraped from a pc battery pack
I scraped some battery cells off two old pc battery packs. In both packs there were a sensor but I can't figure out what kind of sensor it is. Can someone explain what kind of sensor these are? I have ...
0
votes
1answer
43 views
Battery supplying different voltage
I 'm trying to build a portable device running on battery.
It needs power at 2 different voltage: 3v and 4.5v
Is doing something like this a good idea ?
if so, what type of diode should be used ...
1
vote
2answers
47 views
Can I embed this charger in a project?
I have been attempting to create a portable arduino gaming system. While I have tried normal 'AA' or 'AAA' batteries, they are too large, so have decided to use a lipo battery. I now have this, but I ...
-1
votes
1answer
32 views
Charging battery using computer power supply?
I have new 600W ATX computer power supply unit.
I have wired green and black together to make power supply turn on when plugged in.
I wanted to charge my 12VDC empty battery, without dealing damage to ...
2
votes
1answer
60 views
What will happen on regulator as battery gets depleted?
I want to make a 5V-power source with four 1.5V-AA batteries. I think it can be done easily with 7805 regulator.
What I am concerning is the case that batteries are getting depleted as time goes by. ...
0
votes
1answer
43 views
TLV431 as direct replacement of zener?
The answer here suggests using strings of suitable zener diodes to drop the cell-voltages of a battery stack down, to measure the individual voltages by standard (that is non-high voltage) ADCs.
The ...
1
vote
4answers
83 views
Will voltage or current determine a diode drop for this battery charging circuit?
I am using a li-ion battery charger IC that regulates an output to 4.2V. I have a schottky diode in series with the output that then connects to the battery. How do I determine the voltage drop?
If ...
-1
votes
1answer
53 views
What do B+ and C+ mean on the wires of a Lifepo4 battery pack?
I bought this Lifepo4 battery pack. It came with its own charger. The seller told me the charger can be connected directly to the battery.
There are 4 cables coming out of the battery: C+, C-, B+ and ...
0
votes
1answer
51 views
How can I modify the charging circuit of the solar powered system using super-capacitor with or without battery (diagram is attached)?
I 'm working on a device which according to the below diagram, has a solar panel witch gives at most 10v voltage and 30mA current (average 9v and 20mA) and also it has a 6v lead acid dry battery with ...
0
votes
2answers
64 views
What's the correct way to solder wires on that (LiPo) battery's terminals?
I need to solder a wire on each of the terminals on the battery shown below. They are approx. 15mm large.
Should I solder the wires, of use some sort of clamp? It looks like the terminals are made of ...
1
vote
1answer
46 views
Efficient power utilization by MPPT battery charger
I am designing an MPPT solar charge controller to get more efficiency out of my system. At the moment I am at the conceptual stage and I have some questions about MPPT battery charging in general.
...
3
votes
1answer
471 views
What is the purpose of a battery on a GPS receiver?
My GPS receiver has a small MS621FE battery:
Any ideas what might be the purpose of a battery on a GPS receiver?
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vote
2answers
81 views
Battery Voltage Sensing Circuit (Voltage divider, buffer)
I've been trying to figure out a quick and easy circuit for sensing a battery's voltage, then translating that voltage to an 0-5v signal that could be read by a microcontroller like an Arduino.
My ...
2
votes
1answer
185 views
Can a low current (low power) solar panel charge a battery?
I have a solar panel that provides max 7V and average 5.5V under the sun. But it cannot produce enough current even for a little 3V DC motor. Can this solar panel charge a 3V battery? Or maybe two 3V ...
1
vote
3answers
167 views
Simple low voltage disconnect circuit for Arduino
Preface:
Under impression to need a low voltage cut out, to prevent 2x AA NIMH rechargeable battery from being drained too now, and damaging them. (right??)
In deployment this circuit will commonly ...
1
vote
2answers
71 views
AAA batteries solar charging help needed
I have a project running on 2 regular AAA batteries, I'd like to
convert it to NiMH or NiCd rechargable batteries using solar power.
I wanna use a panel like this:
...
2
votes
5answers
185 views
How is time of supplied real time clock module maintained without battery?
I am thinking about purchasing this RTC ( real time clock ) module.
Since this particular item comes supplied without a battery, I wonder how the time is being kept running in the chip since it's ...
3
votes
1answer
164 views
Most efficient way to power both 12V and 5V off a battery
I'm building a lighting project for Burning Man and I have both 12V inputs and 5V inputs that need to be powered off of batteries. Here are the max loads:
ATmega328p - 25mA at 5V
Addressable LEDs - ...
0
votes
0answers
11 views
Pre-Romex AC circuits to DC for offgrid Solar [migrated]
We live in a rural 250 year old colonial that was wired for ceiling and wall sconce electric lights sometime in the mid-1940s. In the early 70's outlets were added, then updated to Romex when a ...
0
votes
2answers
87 views
Battery voltage changing drastically after use
I have a NiCd 2000mAh 7.2V battery that drives two motors. If I run the motors for 30 seconds, the voltage reduces from 7.60 to 5V. Once motors are stopped, it takes a minute to come back to 7.50V at ...
1
vote
0answers
63 views
Charging batteries in parallel when they are connected in series in the circuit
I've got two LIR2450 rechargeable 3.6v coin cells. These need to be connected in parallel to form a 7.2v current which is being regulated down to 5v to power an ATMEGA328P. I need to charge the two ...
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votes
3answers
96 views
How many LEDs can I power with a 3.6V battery?
How can I calculate how many LEDs in parallel I can light with three 1.2V batteries in series?
How long will 3.000mAh batteries last in that case? Do I have to put a resistor at only one of the ...
-1
votes
1answer
97 views
Transmitting 12v DC over a long wire
I'm trying to charge my laptop through a 12V battery and 12-19V adapter over a long wire but I've noticed that the adapter makes some noise and doesn't work.
On the other hand when I connect it close ...
0
votes
2answers
44 views
Getting closer to figuring out my battery requirements
I have been doing research for at least a week and am still a bit confused, but think I am getting to the point where I am close.
I need to power 5V 3-5A. Some days this power source will hook up to ...
2
votes
2answers
118 views
Looking for batteries to power a project I'm working on
Sorry if this is really basic, but I don't really know much about power consumption and voltage. I'm building a sensor system with a small computer with a 19V, 65W power supply, as well as a cloud ...
0
votes
2answers
49 views
Alternatives to relay/contactors in DC circuits
I wanted to switch a 60Vdc line to ON/OFF using a 60Vdc controlling signal for some kind of a feedback system (yes both are 60Vdc). Presently I have two options visible:
Solid State 60Vdc input ...
2
votes
2answers
33 views
Internal resitance of a battery and SOC related?
How do you find remaining SOC of a battery, say 12V 100 Ah? Is it possible by monitoring internal resistance of the battery? Or is there any better way (logic wise) used in industries?
I'm using an 8 ...
1
vote
1answer
41 views
Simple questions about Battery network
I have a question related to small battery connections.
I am working on a project where the design has to be kept as small as possible. I need 3.3V regulated supply and run two small coin vibration ...
1
vote
1answer
90 views
When would a design need multiple batteries?
In general it seems that using only one battery (pack) in a system design is a good idea, as it reduces complexity and cost. One configuration of series/parallel cells rather than multiple ...
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votes
1answer
45 views
Getting 12V out of 60V battery bank
I have a 60V battery bank with 16 Li-ion cells in series. I was wondering if I could get 12V output by connecting a wire across 3 or 4 cells in series and using it to control the 12V dc fan of the ...
0
votes
1answer
45 views
Can someone tell me if this topology for a crude battery charger is sound? Block diagram included
I am making a portable phone charging battery for fun. I have a micro USB input that ties to a 5V - 4.2V buck converter to charge a li-ion battery. The IC is made to charge batteries so I think that ...
1
vote
2answers
86 views
DC-DC converter to drive DC motor
In a robotics application I have to install a 12V (30A) DC motor actuator in a vehicle. The typical setup indicated by the manufacturer is to directly connect it to the battery, because of inrush ...
0
votes
0answers
46 views
Do I need CE in the modules integrated on the device for the device certificaction?
I need to certify a device with CE, but integrated in to the device we use a battery module without CE, it is possible to get CE for the device even if the battery module doesn't have? I'm looking for ...
0
votes
2answers
73 views
Likely to use more power - phone screen or bluetooth le?
Just as a theoretical guesstimate, would a phone screen likely to be more of a battery drain than a bluetooth le connection?
Of course this is going to vary on the amount of data being sent the ...
6
votes
2answers
314 views
Supply three different voltages from the same pack of NiMH rechargeable batteries
I have a battery pack that I would like to use as a source for all of my battery powered components on a commuting bicycle.
My pack includes (10) 1.2V cells wired in series:
...
2
votes
1answer
110 views
How does current flow work? [duplicate]
Do the electrons at the anode (negative end) of a battery flow through the copper to the cathode end or is it only the copper atoms electrons that flow to the cathode end of the battery or does both ...
1
vote
1answer
60 views
UPS batteries and hot/cold weather
I am designing a small network deployment for several buildings without temperature regulation. In planning the power, I can find very little about acceptable UPS batteries for these conditions. ...
2
votes
1answer
284 views
Can batteries conduct from their sides?
Back when I was younger, I used to take apart the old disposable cameras I'd take to camp to have fun playing with the parts and doing a bit of exploring. One year I ended up with a camera with a ...
4
votes
2answers
40 views
Battery recharge protection for a dual-power ATtiny board
I have a small board with ATtiny85 and it has a button cell battery socket on it. The battery that I'm using is CR2032 rated 3V. At the same time, while programming it there will be second power ...
4
votes
1answer
240 views
Car battery desulfation procedure
I have some old ~100Ah car batteries. There is no mechanical damage, they were not overcharged or incorrectly used. I assume they are sulfated.
This is a theory from Wikipedia:
Pulses must last ...
1
vote
0answers
38 views
Rechargeable battery with a photovoltaic switch
I did some searching around on the forum but with absolutely no electrical background, I have exhausted my searching and hope I can explain my issue.
What am I trying to do?
I have a solar panel and ...
2
votes
1answer
83 views
Charging High Cell LiPo batteries
I have a question about charging and balancing a 10-12 cell LIPO battery. I have been searching around for an all in one
solution chip but come up empty. I have also found out that there are almost ...
1
vote
3answers
85 views
Power 4.5V Lego motor by 5V PSU, how?
It's a long story. Please bear with me as I try to describe what I intend to accomplish.
I've got a Raspberry-PI controlled Lego Technics (pre-Mindstorms era stuff) construction.
It uses a couple of ...
2
votes
2answers
153 views
Is it ok to use an old phone as an universal battery charger?
We know that a charger is just an adapter that supplies a constant voltage (5 volts usually). The actual charging circuit is in the phone itself. With a bit of soldering and wiring, can I use my old ...
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0answers
52 views
Battery-load query
Imagine the following circuit. The load consumption varies during the time (during a minute it has 3 different current consumption). When the DC source generates power, where does this power go? (to ...
1
vote
1answer
60 views
What adapter would power device that runs on 3 D batteries? [closed]
I have a clock that runs on 3 D batteries and, as you can imagine, it's a pain to maintain them. I've found a DC adapter that delivers 4.5v (1.5v x 3) but it doesn't budge when connected. I imagine ...
0
votes
1answer
89 views
Is it OK to trickle charge a disposable battery [duplicate]
So I am playing around with designing a UPS when another question hit me.
If I have a source feeding a small amount of current into a non-rechargeable battery is this OK.
By OK, I mean is this ...
