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).

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1answer
8 views

BQ297xy Overcurrent protection

Can someone explaine to me how dose this overcurrent protection works and how to calculate it? BQ297xy Schematics
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2answers
653 views

Nichrome wire not heating up with a 9v battery

I have a 42 gauge nichrome wire. When I pass current through it from a 9v battery, it does not heat up. I have checked the circuit properly and also the battery. Wire resistance: 5.8533 ohms Wire ...
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1answer
1k views

Batteries connection to load and charging port for DIY bluetooth speaker

What I'm trying to accomplish is buidling a battery powered bluetooth speaker. In order to do it I'm using the following parts: Bluetooth amplifier module 3x Samsung ICR18650-26FM Batteries ...
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1answer
255 views

Understanding C20 value of lead battery for a low power circuit

I've developed a simple circuit using a Photon to send data to my database. It has to be a portable device and because of this I looked into lead batteries. My circuit runs on 5V and draws a maximum ...
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0answers
39 views

Calculating battery percentage after voltage drops

I would like to display a battery percentage based on the remaining charge in the battery. I do not know if there is a better way of doing it other than measuring the voltage across the batteries. ...
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2answers
522 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 ...
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1answer
86 views

Can I decrease voltage in a battery to get higher amp hour rating?

I am willing to use my 7.4 volts 1000mAh lithium polymer battery to power a motor that works with 3.7 volts, so I will input the 7.4 volt to a high efficiency buck converter to get an output of 3.7 ...
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3answers
88 views

What is a “safe” amount of amps to draw from this pack

I've been working on a quadruped project, and need some help determining the... safety... of my power system. To start, there's two packs, a larger "main" and a smaller "reserve" the two packs are ...
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3answers
141 views

9v & 2 high power LEDs | LEDs dim after time, bright again after being off

I'm trying to learn some basics of electronics and electricity with a simple solution to a problem. Problem: I have an African Violet in a terrarium that I want to help bloom, which means it needs ...
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0answers
17 views

Making a DC coupler for my panasonic camera DMC-TS5

I have thought about making a DC coupler sort of by: just using the insulated copper wires inside coils, connect each to the nodes of my camera battery (working battery) - will need soldering, ...
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3answers
796 views

Electrifying a Battery Operated Clock

I have a motion clock that runs off of two C cell batteries. One battery runs the movement at 1.5 volts. That other battery then continues in series to run the motion part delivering 3 volts to it. ...
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2answers
135 views

Can a low amps 48v battery handle big DC motor

I have a 48V DC motor, 3500W at 300A, combined with a dc controller with 60A constant and 120A peak discharge rate. Can a 48v li-ion battery with 20A constant and 40A peak discharge rate, safely ...
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1answer
1k views

Lithium ion battery protection IC not able to drive MOSFET

I have integrated the TP4056 charger design into my PCB. The problem is that when I connect the battery at the battery terminals, I am not able to get the voltage at its output pin. The circuit can be ...
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1answer
151 views

Noisy op amp buffer

I made an op amp buffer using a TL071 for my guitar but it is very noisy. The circuit is a simple follower. Originally I had no feedback resistor but I added it later in case it decreased the noise ...
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1answer
55 views

High Current voltage regulator. using 7805

I a have a battery that supplies a a voltage range of 11.1 - 12.4V depending on how charged it is. I would like to regulate this down to 5v. The issue is I would need to draw up to 6 amps through it. ...
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1answer
100 views

Connecting a Lithium battery directly to the GSM module

I have a GSM module (M66 from Quectel) and a single cell Lithium battery,Based on Datasheet module operated in the 3.3 ~ 4.6 V and as I know battery deliver 3.7 ~ 4.2 V based on it's sate of charge....
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1answer
82 views

LDO requirement for battery powered micro-controllers [closed]

What are the selection parameter for battery powered ultra low powered application? (Battery capacity of 3700mAh, 3.7V 18650 Li-ion) I'm designing an application with MSP430/Atmega328 + RF micro-...
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1answer
63 views

Crock pot on power inverter

I have a slow cooker crock pot thats uses 120 volts AC which range from 0.6 amps to 2 amps and consume electricity that ranges from 70 watts (low temperature) to 250 watts (high temperature). When I ...
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1answer
100 views

Choosing an appropriate voltage regulator to limit power consumption

I am new to the electronics world and trying to figure out how to choose the battery for the circuit. The circuit consists of an ATMega328P-PU, a DS2321 RTC and a PIR motion detector sensor. It needs ...
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0answers
29 views

Total Power Cutoff circuit

I'm designing a battery controlled circuit using a 555 timer to control a mosfet to provide power to a load. The problem I'm trying to solve is to reduce the current draw while the circuit is not ...
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1answer
70 views

Simple low power rising and falling edge enabled circuit

I am working on a project where I use an esp8266 and a reed switch sensor (NO), this is powered by a battery so I need a low power circuit that can turn on the esp8266 when the state of the reed ...
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1answer
36 views

How to prevent circuit from shutting down when motor drain too much power

I have a device which has motor and circuits with PLC. This device is connected to a 12v battery which is powering the PLC and motor. Everything is working fine but when the motor's load is heavy, it ...
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3answers
234 views

Portable 5v power supply to duplicate wall wart

I've got a wifi device that works off of a 5v 2a wall wart. I need to walk around with it to get some signal strength ratings, so I am making it a portable power supply. However, the device won't ...
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0answers
77 views

Battery management - disconnect battery like this?

For a portable device i have the following battery management circuitry: I'm using the MCP73871 for charge management and power oring and the BQ2972 for over discharge protection. If VBUS is ...
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4answers
7k views

RF Wakeup - Battling power consumption

I am currently using two nRF24L01+ (2.4 GHz RF transceivers) together with two AVRs to create a keyless entry system. My problem is battery lifetime when using a CR2032 battery to power the key. The ...
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0answers
25 views

Full charged battery age

I design a schematic for a alarm device. I use a trigger IC use 40nA and i want to use a 2500 mAh Li-Ion battery. The device is used at outdoor (-20/60 C) at least 2 year. I want to ask that a fully ...
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2answers
118 views

How bad would it be for a NiMH battery or/compared to a Lithium-ion battery in a device to sit unused for years?

I have a Sonicare toothbrush which has Lithium-ion battery and a body hair trimmer that has a NiMH battery. I have charged the Sonicare once or twice without ever using it, just to stop it go to 0% ...
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3answers
59 views

amplify/increase current from 9v battery

I have a working circuit that generates a signal (a range of slow and fast tones) and sends them to a speaker. I tried to switch to a piezo driver and speaker and was successful using the MAX9788 as ...
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1answer
143 views

Identify dead component in notebook battery

Battery name is GARDA31, based on bq29330 and bq8030. Most probably I killed it myself when soldering by shorting terminals with solder wire :( Controller is alive (communicates through SMbus), but ...
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1answer
149 views

How to fix 4AA battery pack holder

I have a battery pack holder. I have tested the batteries with my multi meter. It appears that the ground and power wires on my pack holder are not working. Does this mean that the wires are not ...
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1answer
254 views

ON/OFF push button circuit with battery under voltage protection

I have put together the push button circuit explained in TI's SCEA048B application report with an under voltage protection using TI's LMS33460 chip. I ended up with the circuit attached. The idea is ...
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1answer
253 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 ...
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1answer
59 views

Can I work 30 of these Solenoid Valves from a battery?

The (30) solenoid valves are 12v, all identical, each controlled by a relay and are rated at 6.2 watts of power consumption. They will all be turned on simultaneously and turned off separately. This ...
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1answer
52 views

Converting Battery Operated Motion Sensor Light to AC Powered

I have converted many battery powered devices to AC adapter in the past. This time around I am using a Motion Sensor light which takes 4 C batteries and is used to light a closet. When I connect a ...
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0answers
31 views

Can I put two loads on one battery and both loads draw 3.7v as they expect?

I have a project in mind where I replace the tinny 40mAh LiPO battery of a "smart band" (Like a Mi Band 1) and replace it with a regular 18650 LiPo battery, so it last a long time without recharging. ...
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1answer
1k views

NiMH battery for Electric Bike

I've come into an electric bike that currently has a NiMH, 24v, 20cell battery pack. On the pack as well it says 8000mah. The previuos owner has misplaced the original charger :( The bike has been ...
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6answers
8k views

Can I disable a battery powered device by reversing half of its batteries?

When I have a device that is powered by two batteries, can I disable it by turning one battery around? For illustration, the purpose is to leave batteries in the device for storage, but it does not ...
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2answers
188 views

Charging 3.7 V Li Ion battery with 5 V DC [closed]

I am trying to create a charge circuit to charge nominal 3.7 V (range of 3.5 V to 4.2 V depending on state of health) li-ion battery from 5 VDC. I don't want to use specialized charging ICs if ...
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1answer
31 views

Directly wire inverter to switches/lights/etc [closed]

I have a 12V deep cycle marine battery that is charged by a 20W solar panel. This works well. However I would like to use the battery to run two 120V 170mA 15W LED lights in a shed. So as I understand ...
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0answers
64 views

Using BMS in serial with parallel charging

Is it possible to connect two 4.2V 18650 Li-ion batteries in series but have them charged in parallel with 5V Usb wall charger? I have HX-1S-3576 as BMS. If i use 4 of these BMS as shown in the ...
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1answer
49 views

Power-supply made of battery+solar cell, ultra low power

In various scientific calculators, we can see that they have "twin" power, basically a mixture of a solar cell and a battery. I would like someone to tell me what kind of circuit usually takes both ...
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1answer
53 views

Using a modified non-proprietary battery for CPAP

My apologies if this isn't the correct place for this question. I am not familiar enough with some of these concepts to move forward on this without bouncing the ideas off of some more experienced ...
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2answers
79 views

How to heat an e-cigaret coil

I am working on making my own "mod" for an e-cigaret (A mod is the device that controls when and how much the coil is heated up to) I have read a lot about it during the last couple of days, so i ...
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3answers
1k views

Is there a way to step up voltage without consuming power when there's no load?

Is it possible to take a lower DC voltage, such as the 1.5v from a AA battery, and step it up to a higher DC voltage, such as 5v, which keeps that 5v potential even when there is no load, and which ...
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0answers
61 views

Motor driver powered by PSU instead of battery [duplicate]

I am about to use a motor driver in a project (MDDS30 by Cytron) and I was going to power it using a 12v 11.5a PSU. I discovered that the manufacturer warns against using a PSU, and that it might ...
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3answers
118 views

Real thing or just misinterpretation? Rotating batteries to make TV remote work

When TV remote isn't working, I rotate the batteries in the remote in their place and it begins to work. I don't see any kind of deposit between the batteries and the contacts. Rotation of battery ...
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1answer
106 views

Measuring battery voltage and impedance

I have been trying to figure out how to properly measure battery voltage for a few days. The more I read, the less I understand. I know there are many questions like this out in the internet and I ...
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1answer
74 views

Does a CR2032 take damage when connected to a 5V rail?

I've seen applications (Nintendo game cartridges, for example) that uses a coin cell battery for backup power to some RAM-chips (for savegames). When the ordinary 5V is gone, the battery takes over ...
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10answers
3k views

Would a 7805 5 V regulator drain a 9 V battery?

Doing some DIY as a hobby, I'm making a small humidity-temperature radio sensor. An ATmega328 is reading from a DHT11 sensor and then transmitting data to a Raspberry Pi by an STX882 radio ...
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2answers
203 views

Do Duracell AAA batteries have internal short circuit detection?

I was shorting a Duracell AAA battery in a SAFE area with proper precautions. After 2 minutes I disconnected the circuit and measured the voltage, it dropped from 2.8V to 2.6V and the battery was hot. ...