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).

62 questions with no upvoted or accepted answers
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674 views

How to protect single cell Ni-MH battery (overcurrent, undervoltage, overtemperature, etc.) during discharge?

Story I am designing a boost converter for a battery powered board. I am planning to use single Ni-MH battery. The needed output voltage is 3V3. The device will be in deep sleep mode (drawing few ...
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69 views

Ultra low power battery

I am currently in the middle of a project and I am quite unsure of what type of battery and battery charger I should be using. To be honest I have never worked with battery or battery charger yet. In ...
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108 views

What is the reason for high frequency noise when amplifier is powered with battery?

Hi I made a small headphone amp and powered it using lipo battery.voltage is stepped up to 5v.everything is working with direct supply (ie., while charging battery)but as soon as I unplug the charger ,...
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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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0answers
190 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 ...
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1answer
249 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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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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76 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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168 views

Proper capacitors for ESP8266-12F?, resetting at high current peak

When using the ESP8266-12F on a PCB I designed myself it keeps resetting after a high current spike of another module (Sim800L). I ofcourse tried to solve this using capacitors but I seem to have made ...
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60 views

Raspberry Pi wake-up and battery power circuit

I am working on a Raspberry Pi (3B plus) project that - at times -needs to operate on battery power, and on external power whenever available. The RPI needs to operate only when a dedicated sensor ...
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1answer
140 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
979 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
60 views

Possibility of series connected LIPO batteries for running stepper motor

I have project where I am using a motor driver DM860A2 to run NEMA 34 85 kg-cm stepper motor. Currently I have used a transformer to supply 48V AC during testing. I have with me four 2200 mah 11.1V ...
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1answer
83 views

+ and - 12 V power supply with 12v Batteries, How to make a ground rail with both batteries

I'm new to electronics. I want to make a battery supply to power an OPT301M {photodiode with integrated op amp} and an ADTL082 dual {op amp IC} in order to attempt to reduce noise in the circuit. I ...
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1answer
41 views

How much energy do Li-Ions/Li-Pos have below 3.2V threshold?

How much energy does a battery still have when a protection chip disconnects it? I know that such discharging kills the battery, but in some cases it would be useful. For example, in drones: when you ...
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0answers
2k views

Use the BMS from laptop battery for single cell

I have just disassembled a battery pack from a Lenovo laptop (Series: 45N1005 with six cells, Specs: 10.8V, 5.2Ah, 57Wh) and I would like to use the BMS for controlling a single 18650 cell (2.8Ah) ...
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116 views

Full time vacuum pump/powered by solar array and battery

I am putting together a vapor extraction system consisting of a small 12 volt (500 mA to 1 A) 6-10 Watt, rotary vane vacuum pump, powered by a solar array with controllers and battery. My goal would ...
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1answer
252 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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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) -...
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231 views

ESP8266 servo controler

I am building a small application, that should be able to connect over wifi to server, pull some data and turn a connected servo accord the result. The system should be powered on battery. Is this ...
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0answers
1k views

L293D causing motors to move slowly

I'm modifying an RC car to use bluetooth. I use the L293D chip, and when I connect the motor to the chip, the car barely moves. If I connect the 9V battery directly to the motor, it moves the car well....
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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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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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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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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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61 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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47 views

Is there a circuit that conserves energy of multiple power sources?

Say I have several batteries. To start all the batteries are "dormant"; there is no current running through them. Starting with the first battery it runs current through it until it dies, wherein the ...
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1answer
149 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
44 views

Voltage regulator STBY & OFF - whats the difference?

I am looking at MAX883 voltage regulator and from the documentation is not very clear whats the difference. It says this about pin OFF: In this mode, the pass transistor, control circuit, ...
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0answers
64 views

Multiple devices on 1 battery

My current project is a green lantern minigun prop. I 3d printed it already, im just working on the electrical end of things. I have a 12v drill motor that im using to spin the barrels. also in that ...
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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 ...
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1answer
64 views

What is the cost of converting 12V (lead acid battery) to 220V and back again to power 12V appliances?

I have a small house measuring ~ 8m x 4.5m. It is in Indonesia and power outages are expected daily. Probably the daily power outage is on average less than half-an-hour, but sometimes the outage can ...
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44 views

Mountain Bike Light Bar 18650 battery pack

I have a 6 Inch LED Spot Mini Bar Light which is used for vehicles, it uses 12-24 V and is rated at 18 W of power. I have some 18650 batteries which would work perfectly for this project. What would ...
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1answer
53 views

200AH lead acid battery

I have a 12V 200AH lead acid battery and I want my load be a power resistor and a bulb. Does the batter draw current based on the load resistance? so meaning the current that will be drawn in this ...
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44 views

Charging Voltage of Lead Acid Batteries

I recently installed a solar ups and it has been charging the batteries all the time. I have two 12v 230ah Batteries (lead acid tubular) in series and my solar charger software says that it is ...
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2answers
69 views

What determines if a battery is charging or discharging in a circuit?

I have a basic understanding of DC circuits from high school and university physics courses, but those courses only covered circuits that discharge batteries. I'm trying to build an rudimentary ...
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118 views

MCP73831 stat pin current

I'm trying to implement a bi-color LED connected to a Microchip MCP73831 battery charge management controller, so I can switch between red and green LED output. Currently my circuit is mixing them ...
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0answers
70 views

LM4890 amplifier and CR1616, how to improve power consumption?

I'm a hobbyst trying to design a simple circuit for amplifying the PWM audio output of an ATTINY85. I'm using an LM4890 (1W amp) and a 1W microspeaker. The problem comes when I supply 3V with a small ...
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70 views

How can I connect many brushless motors to a big battery pack instead of using a separate small pack for each motor?

Usually brushless motors comes with indications on how many batteries you can connect to them, it is common to to see 2x3 battery packs where each battery provides 3.6 Volts or so to power a single ...
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0answers
22 views

Mixing Reverse Polarity Protection PMOS with a Piezo Element

I have a circuit that powers some leds when vibrations are detected. I am trying to integrate a PMOS for reverse polarity battery protection. When the PMOS is present the circuit simulation fails as ...
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0answers
125 views

Any Issues Getting BeagleBone Black Wireless to run off of LiPo with Diode Fix?

This helpful question pointed me into the right direction for powering the BBB with a 3.7V LiPo battery. However, as this answer demonstrated, I won't be able to give the WiFi/BT module power in doing ...
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0answers
69 views

“lithium for buffered usage in UPS”, or floating-charge lithium accumulator

For lead acid there are typically two paradigms of charging (or use-scenarios). First one is deep cycles, when you exaust 40-60% of capacity (not less than 12.4V), then charge it to 14.4 with ...
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120 views

battery backup switching

I am working on an appliance project in which I have been tasked with the design of the power supply. The project specifications hold that from a 230v 50Hz wall supply two voltage rails of 5v (for ...
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0answers
25 views

Dedicated li-ion step up drivers

I have a design which will include the optional use case of boosting up to 7V from a li-ion battery. I can't seem to find any drivers dedicated to li-ion for this? There seem to be a few buck boost ...
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1answer
99 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
72 views

How to calculate 18650 battery use time?

I am currently powering my mini fan using a normal power bank (the one used for smartphone) which is 5V, 2A output and can last for around 6-7 hours. If I power my fan using two 18650 3.7V 2300mAh (...
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1answer
251 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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15 views

Where can I get informations about smartphones battery datasheet?

I'm hardly trying to find the datasheets and I still got nothing :(, what I was try to find is like Asus battery for Zenfone 4 Model: C11P1404 datasheet. Please for your kindness tell me where can I ...
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1answer
52 views

How can software give an accurate estimation of remaining usage time for a worn battery?

I understand that the system can read the current voltage and determine battery remaining percentage from that. Say, if a Li-ion battery in a mobile phone is at 4.3V, it's likely the battery is full. ...
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264 views

Does mixing and matching battery capacities result in a bottleneck when wired in series?

I want to make a 12V battery pack to run an Nvidia Jetson TK1 for an afternoon. I am new to using batteries and was wondering - will mixing smaller capacity lithium ion batteries with larger capacity ...