We’re rewarding the question askers & reputations are being recalculated! Read more.

Questions tagged [battery-operated]

Involving or pertaining to a circuit or device that is intended to be operated with cells or batteries (as opposed to mains power, for example).

Filter by
Sorted by
Tagged with
0
votes
1answer
53 views

Would the Bluegigga WT12 be suitable for a battery powered application?

I understand that the Bluegigga WT12 requires RS232 when using UART which is what I'm planning to do and thus it requires high voltages? Would that make it unsuitable for a battery powered application?...
0
votes
1answer
407 views

Battery Power Management PCB Design [closed]

I am working on an old PCB that uses a lot of the TI IC's for performing its functions. It's essentially a power management board that takes a DC input and charges 12 batteries connected to the ...
0
votes
1answer
895 views

Charging 3 Li-ion batteries in parallel and discharging in series

I would like to design a circuit that charges 3 Li-Ion batteries in parallel with a 1S charger, then switches the configuration to put them in series to discharge as one 11.1V battery pack. This is ...
1
vote
2answers
611 views

How to use the Shutdown pin of a switching regulator?

What are the systematic/standard methods for incorporating the SHDN (shutdown) pin of a buck/boost IC? Take MAX756 for example (datasheet). Here are its I_q profile: Suppose I'm using an Arduino nano ...
0
votes
2answers
111 views

Different behaviour of batteries with same voltage read

I am powering an embedded system using one 3V Lithium battery. Two similar devices were acting very differently: when they both were on, the voltage read across the batteries were different (2.9 and ...
0
votes
2answers
2k views

Best Way to Get 5V, 2A from a 2-Cell LiPo Battery

Part of a circuit I'm designing needs to control servo motors rated for 5V. I've measured that they can draw over 1A when active. The issue is that my circuit is powered by a 2-cell LiPo battery, ...
0
votes
2answers
498 views

Increase current draw of a low-voltage DC fan circuit

I have a DC fan circuit that is intended to run off of a portable USB battery pack. The fan is a 5V brushless computer fan that draws approximately 250mA. The issue I am running into is that all the ...
1
vote
2answers
190 views

short circuit current battery

I am working with a zinc air battery. When I short circuit my battery with a wire and record the voltage at the battery, my voltage is decreasing until 0 mV. Can I say that my battery is dead ? In ...
2
votes
1answer
128 views

Discharge Behavior of a Battery

I am working with a zinc air battery (emf 1.3 V). I have plugged a resistance of 100 ohm to this battery and I have recorded the voltage at the battery. When the circuit is opened, the voltage is 0. ...
0
votes
1answer
1k views

GSM SIM900A battery power supply circuit

I want to power GSM SIM900A with Lead acid rechargeable battery 12V, 1.2Ah. The voltage regulator I am using is L7805 which gives a regulated output voltage of 4.9 V. My GSM SIM900A modem is My ...
0
votes
1answer
814 views

Replace a battery with a power supply

I have this battery operated lawn mower (https://www.mowersdirect.com/Homelite-UT13110-Lawn-Mower/p10883.html) but the battery died and I just want to replace it with a wired power supply. The battery ...
20
votes
7answers
4k views

Why do batteries in consumer electronics get used unevenly?

When changing the batteries of kids toys, remote controls, etc., I test the batteries and have noticed that they drain differently. One will be dead and the other is still in the green. Why does this ...
0
votes
1answer
155 views

Sound generator: 14500Hz frequenzy (required), 90db (required), should run ~24days on battery (if reasonable) [closed]

I am looking to build the following thing: Sound generator: 14500 Hz frequency (required), 95 dB measured at source (required), should run ~24 days on battery (if reasonable). There are two major ...
1
vote
1answer
451 views

Mechanically and electrically controlled mains switch that preserves mechanical control without power?

Is it possible to build a battery powered circuit that switches an electrical load (e.g. lamp), controlled both mechanically with a physical switch and electrically with a relay and preserve the ...
1
vote
1answer
242 views

Battery powered RGB matrix board

I'm not sure if this is the best place to ask this but I'm not sure where else too For my graduation I'm trying to embed a Led RGB matrix display connected to a raspberry pi on my cap. Iv seen this ...
2
votes
2answers
852 views

How do I limit the current drawn by a DC fan to increase battery life?

I have a simple 5 volt DC circuit powered by a LiON battery. Running a fan that is rated at 5 volts 100mA-300mA. The battery has a 1000mA output max so the fan draws its full 300mA. I am looking ...
0
votes
3answers
517 views

How to create a constant current source from a 12V,19AH Battery which is load independent?

My intention of connecting a copper coil directly to Battery is to basically make the copper coil red hot to boil water. What I have observed is when I connect the 12V,19AH Battery to the 15mm ...
-1
votes
1answer
60 views

Circuit for power switching

I have a LED strip and 12v LED TV and I run them on 220v to 12v power supply but my 220v ac is cut off daily for hours and back again so I bought a 12v battery. I built the following relay circuit ...
0
votes
1answer
182 views

How to avoid incorrect ADC readings due to a draining battery supply? [closed]

For a battery-powered design (3 to 3.6V), I'd like to use a sensor that outputs a small, low-power AC voltage signal. To sample this signal, an ADC is used (this ADC is also powered by the battery), ...
1
vote
1answer
158 views

LCD controller works with adapter but not with batteries

I started making a "case-top" as I like to call it. Raspberry pi 3-based laptop. Took an electrician's case emptied it and started putting the components in. https://www.sparkfun.com/products/12711 ...
1
vote
1answer
2k views

How much current does a battery store?

I have always been confused when it came to how much charge does a battery charge. Let's say, a phone battery: It says 1900 mAh @3.7 v. Now i know it goes up to 4.2v, but those 1900 mAh are available ...
2
votes
1answer
1k views

Batteries connection to load and charging port for DIY bluetooth speaker

it is my first question here, so I hope to write this in the right way. What I'm trying to accomplish is buidling a battery powered bluetooth speaker. In order to do it I'm using the following parts: ...
0
votes
1answer
311 views

Can lack of current cause servo motors to burn out?

I am building a quadruped robot from 10 MG996R servo motors. I am powering them with 12 Eneloop AA batteries, but I am starting to see that I might be lacking current. The servo spec says that each ...
1
vote
2answers
218 views

Assistance with circuit design [closed]

Ok, so for the past few days, i've been getting more and more interested in Peltier Modules, and i've finally decided to make a portable mini fridge with one. After MANY long hours of research, part ...
2
votes
1answer
1k views

Can I Run An Appliance From a 24v Battery?

First, a little backstory. My wife is planning to operate a booth at some craft fairs and we require power for a piece of equipment (Silhouette Cameo, a computer controlled vinyl cutting machine). We'...
2
votes
1answer
341 views

My DC-UPS - done right ? Advice needed

I'm working from a while ago on a DC-UPS concept, after I've put all the things together and I'm requesting from you an advice, can I start to build it or I have serious flaws in it ? Current comes ...
0
votes
2answers
104 views

Battery selection for a robot

I am currently building a line-following robot for a competition this summer. I have figured out everything except the power. I expect my robot to draw 7.5 amps in the worst case. now, I've selected ...
0
votes
2answers
520 views

Step-up or series lithium cells?

I'm building a multi purpose battery box for the car. It'll have at least a USB and a 12v cigarette lighter output, and retractable clamps for connecting straight to the car battery in the event that ...
1
vote
2answers
89 views

Steady Voltage Supply for extended runtime: Batteries in Parallel?

I have a device to measure tilt which is powered by 2 batteries (9 Alkaline Battery, Industrial by Duracell). So essentially, the voltage supply is 18V. I am using it for a project that came with a "...
1
vote
3answers
1k views

Using a dc power supply instead of batteries

I have a device which takes 4xD batteries which I would like to instead hook up to a spare wall charger. I have looked at the voltage of the batteries and it seems most batteries are 1.5V. My device ...
2
votes
2answers
4k views

Protect lithium battery in parallel

This question is somehow the continuation of this question : Batteries and running time (reed the comments for more information)And my question is, can I protect my lithium battery in parallel like so ...
0
votes
2answers
279 views

Controlling a LDO with voltage detector

For one of my project I need to shutdown my system when my Li-ion battery reaches 3V.But I want to know if I can use this type of component : http://www.farnell.com/datasheets/11601.pdfhttp://www....
1
vote
2answers
41 views

What is the minimum connection required to power a digital camera externally?

I have a Canon compact digital camera Model IXUS70 which I want to use for time-lapse photography. The battery doesn't power it for long enough so I propose to gut an old battery and turn it into a ...
2
votes
0answers
173 views

Powering 10.8V DeWalt cordless drill from mains

There was a couple of questions on how to power a cordless drill, but they are all about power supplies. I've got a DeWalt 10.8V cordless drill and its battery connects through 4 pins instead of 2 or ...
0
votes
1answer
75 views

Running different voltage motors from one battery

I would like to run a 12v motor and a 24v motor both from a 24v battery, through an Arduino. Is it possible to use a regulator for just the 12v motor to stop it being damaged, but still get the full ...
1
vote
0answers
59 views

Changing AA batteries for rechargeable Li batteries

I want to change 2 AA batteries in series for rechargeable batteries. The specs of the device are the following: -Input Vcc: 1.8-3.3V (It seems to support 3.5, not sure if it can be an issue) -...
0
votes
3answers
871 views

Batteries and running time

If I have a system working at 2.5V-0.3mA powered by two CR123 3.7V-2000mAh.Is my system going to last the same time if I put my batteries in parallel or in series?Because if I want it to last 12hrs a ...
0
votes
1answer
418 views

Minimum battery capacity

I am working on a project that it has to work at 2.5V-0.3mA, 12h a day during almost 2 years. The probleme is that I don't understand something. I did some calculation of the minimum capacity of the ...
1
vote
2answers
63 views

re-attach battery driven gamepad to PC power supply

There are times at that I get mad about empty AA batteries or accumulators losing their capacity too early. And since the gaming computer is running anyway, I thought about using one of the molex ...
4
votes
2answers
1k views

Atmel SAM E70 (ATSAME70Q21, Cortex-M7) battery backup

I'm building a USB-powered demo board with the Atmel SAM E70 controller, and a single hurdle I'm facing is the battery-powered operation. I intend to use a simple 3V coin cell battery as a backup ...
1
vote
2answers
1k views

Battery monitor with ADC (max 1.0V): can I use this resistor voltage divider?

I have a project with ESP8266. It will run with Li-Ion battery, solar panel to charge and a buck-boost 3.3V regulator. I want to monitor the Li-Ion battery using ESP8266. It has an ADC with max ...
1
vote
1answer
62 views

Sizing a battery according to an existing solar panel (and not the opposite!)

I have one 60-cell 260Wc ~30V ~8.5A panel left over after a solar installation. I did record consistent and factual 1400Wh per day and per panel in winter. I want to use the energy of this extra ...
1
vote
2answers
934 views

Powering circuit directly from USB while charging li-ion battery side by side

What I am thinking of implementing: 1. I have remote monitoring circuit using gsm which senses electrical parameters like phase, power, ac supply etc. Now considering case of no ac supply available ...
0
votes
1answer
203 views

How can I keep a steady voltage from car battery to power a switch even when battery voltage drops?

I have a customized car with 2 engines. I have no mechanical door opening system for the doors as I have removed it in favor of a remote-controlled electrical solenoid. I have recently installed a ...
0
votes
4answers
916 views

Can I wake ESP8266 with photoresistor like in this schematic?

I want to wake ESP8266 when the light turns on, send information to the server, go to deep-sleep for a few seconds and then send the information again and keep doing that. If the server stops ...
0
votes
1answer
82 views

Battery bank paralleling

Sir's/ madam, Is it possible to make a parallel comnection of 110V DC battery bank which are about 4 kms apart from each others. How to calculate the voltage drop and size of cable in between. Thanks. ...
0
votes
1answer
42 views

bulid 12v switch off circuit

i have a tv that works on 12v dc and also 220v Ac. i can attach both power cables. I run it on the 12v battery almost of the time but some times the 220v electricity is back so i have to make it work ...
0
votes
1answer
178 views

questions on powering a router with 9v alkaline battery

so I have a Linksys router which I want to power with batteries. so it can be a portable router. The Original Power supply for the router is rated 12V DC 0.5A MAX. I've tried powering the router ...
1
vote
1answer
93 views

Which voltage to replace a battery?

I have a little drone project that use among others thing two camera,these two camera use a battery Olympus LI-100B (Li-ion battery 3.6V 1350mAh ). On the drone the source of power will be a 3s 5200 ...
0
votes
1answer
151 views

Boosting Peak Draw spec on LiFePO4 using Capacitors

Attempt to replace a 4.5Ah 12V Pb battery with LiFePO4 for a Profoto Acute B flash generator I have a detailed writeup here... Previously I had used a Tenergy drop in Li replacement which worked for ...