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Questions tagged [low-battery]

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Embedded device with Hardware issues consisting atmega 328p, RFM96 and ADXL345

I have a device that works on 3V battery (2 D size cells) now I want to debug it so that all the devices work correctly. My device consist of atmega 328p, running on 08 MHz Crystal which gets readings ...
Talha Ashfaq's user avatar
2 votes
3 answers
115 views

Simple circuit to bypass preamp when battery fails

A guitar has an on-board battery powered pre-amp between the pickups and the output jack. This is great until the battery fails, when it goes dead until the battery is replaced. I would like to have a ...
Argy's user avatar
  • 21
6 votes
5 answers
2k views

Best way to halve 12V battery voltage for 6V device, while still being able to measure the battery level?

I have a device that is powered by 4 AA (4x1.5V=6V) batteries, but I want to power it with a 12V battery. The device measures its input voltage to determine the battery level. I only need to know if ...
Juicer's user avatar
  • 377
0 votes
0 answers
55 views

Troubleshooting a Low Voltage Cutoff (LVC) Circuit for Overdraining Prevention

I am attempting to design a Low Voltage Cutoff (LVC) circuit to safeguard against overdraining my 12V rechargeable battery. The objective is to halt circuit power once the battery voltage drops below ...
Karampistis Dimitrios's user avatar
2 votes
2 answers
94 views

Unpowered LM393 Comparators

I'm working on a battery powered device and would like an LED to come on when the battery is getting low. In the given schematic, the LED is a red LED having a forward voltage of 2V, Lite-On product ...
Chris's user avatar
  • 95
0 votes
0 answers
32 views

MSP430FR4133 Low Battery Voltage Periodic Monitoring

Here is the code I used to configure and monitor my voltage that when it becomes 1.2V, BATTERY_ON symbol on my LCD is ON. The checking of voltage is every 10 seconds. This code below works using ...
Bravo's user avatar
  • 21
0 votes
0 answers
31 views

Why would a battery pack read as a lower voltage before being disconnected from device, then read as a higher voltage after [duplicate]

I'm working on a device that uses a proximity sensor to count the number of times something passes through its field of view at a certain distance. It is connected to an Arduino Nano and a battery ...
E.HP.S's user avatar
  • 349
0 votes
1 answer
84 views

Electric guitar with active electronics and a DIY battery gauge

There is a primitive DIY battery charge monitor which blinks a LED after input voltage drops lower a certain level. Let's call it battery gauge. Also, there is an electric guitar with active ...
Vladislav Rishe's user avatar
0 votes
1 answer
30 views

RTC UPS power cycle on low battery

My RTC UPS switches on and off the whole time when the battery is low. I think it could be with the voltage monitor circuit as with the led indicator on the ups it shows the ups's battery voltage is ...
Lancerio's user avatar
1 vote
1 answer
96 views

Are there any substitutions for depletion PMOS transistors?

I am currently building a low-voltage cut-off circuit. When the battery is under 10 V, the microcontroller should pull the battery power to ground which will blow the fuse with high current and cut ...
Terrence's user avatar
-1 votes
2 answers
327 views

When is it time to change out batteries in multimeters?

On my multimeter, the D.C. voltage readings get inaccurate over time due to battery discharge. How can I tell when to change out the batteries? By consulting the manuals, I found what is displayed ...
fixit7's user avatar
  • 209
1 vote
1 answer
501 views

Ultra-low power low battery disconnect circuit

I am trying to design a circuit to replicate the behavior of the LTC4071 battery charger/protector IC (see datasheet here). In particular I want to replicate the low battery disconnect function which ...
John's user avatar
  • 121
3 votes
1 answer
200 views

Single-cell lithium battery powered comparator circuit with hysteresis

I recently was reviewing a circuit I made and began to question its feasibility. The circuit cuts off a battery's connection to a load after the voltage has fallen below a certain threshold. To ...
Feynman137's user avatar
  • 1,263
1 vote
1 answer
82 views

Trinket M0 - Using USB serial out when running on battery

I am using a Trinket M0 for navigation lights on an electric R/C plane. I thought it would be useful to also use it to monitor my LiPo voltage so I know if it is safe for another flight. For debugging,...
svenyonson's user avatar
2 votes
2 answers
4k views

Voltage of 3 V batteries [closed]

I ordered 3 V CR2 batteries. Actually they are 2.92 V and 2.93 V. Should I consider them faulty, or is this difference from the nominal voltage acceptable?
user31264's user avatar
  • 219
0 votes
2 answers
630 views

Low-voltage shut-down compatible with deep sleep in a battery-operated ESP32

I'm designing a battery-operated device driven by an S2 mini board, which is based on an ESP32-S2 microcontroller. In order to save battery the board wakes up every 15 mn, does its thing, and then ...
Mathieu's user avatar
  • 175
1 vote
0 answers
97 views

What would prevent a new AGM battery from fully charging?

What can prevent a new out-of-the-box AGM battery from fully charging, given that neither age nor sulphation are factors? Specifically, one of the six cells in my brand new Parts Unlimited battery is ...
Vogon Poet's user avatar
1 vote
1 answer
176 views

Cheapest way to detect low voltage of a battery

I have 29V battery which drops to 24V at about 30% capacity. I want to detect when the battery goes lower than 24V and generate a 12V signal. (I have 12V auxiliary supply for lights etc) Since I'm ...
across's user avatar
  • 1,150
1 vote
1 answer
768 views

Dual cell protection using DW01

I am using GS7001B-84 dual cell charger to charge battery. Now I want to protect these two cells. I have DW01 battery protection IC and AP2302B N channel mosfet. How can I protect battery using these ...
rs04's user avatar
  • 57
1 vote
0 answers
228 views

Relay Buzzer Circuit

I'm trying to set up a circuit to protect a battery in a battery box, using some parts I had lying around. Its job is to open the primary relay (load/charging) and sound a buzzer when the supply drops ...
Karl's user avatar
  • 11
0 votes
3 answers
1k views

Can we use Zener diode as battery low voltage cut off?

Suppose we have 150 watt and 300 watts portable photovoltaic system with 13.5V battery (50Ah) and we want the low voltage cut off point to be set at 10V. Can we achieve this simply by using zener ...
engr.duet11's user avatar
0 votes
0 answers
570 views

Wake up MCU with radio signal using a battery

Currently I have a project that runs with the chip from Arduino (Atmega328p). This is what it does: It wakes up. Powers the NRF24L01 module. And it configures it to only send one packet ...
Tono Nam's user avatar
  • 557
0 votes
1 answer
98 views

Under what conditions does a p-FET gate have to be at a higher voltage (or more negative) than its source?

Is there a general rule for p-FET's that explains when Vg can can be higher (or more negative) than Vs? I had posted a while back and a helpful person explained I needed to keep Vgs higher than Vds, ...
VanGogh66's user avatar
  • 301
0 votes
1 answer
1k views

12 V, 7 Ah SLA battery reads 0 (zero) volts

I have a new 12 V, 7 Ah battery which reads 0 (zero) vokts. Let me explain the situation. I have a 800W UPS (for pc) whose battery wasn't giving enough backup. So I decided to replace the battery. I ...
Omaid_it's user avatar
0 votes
1 answer
257 views

Battery Charger Cut off

I need to confirm that this circuit will protect battery against over charging or not. https://bestengineeringprojects.com/12v-7ah-smart-battery-charger-with-pcb-diagram/ Which is better circuit for ...
Omaid_it's user avatar
3 votes
2 answers
390 views

Why does this lithium battery have such a flat discharge curve?

I'm trying to understand some apparently anomalous observations of the discharge profile of a 1S lithium battery. I'm using this battery to run a Raspberry Pi Zero W, back-powering the Pi via the +5V ...
John Auld's user avatar
  • 133
1 vote
1 answer
81 views

How to estimate Li-ion battery health for an unused smartphone? [closed]

I am considering purchasing a new smartphone that is several years old and could use a little electrical engineering help from the EE geniuses here. I've performed quite a bit of research, and found ...
End Antisemitic Hate's user avatar
0 votes
1 answer
59 views

Questions about Li-Ion batteries

I am working on integrating single 4.2V Lithium battery(400mAh capacity), charger IC, and battery fuel gauge for an embedded project. I have watched several TI training videos about battery management,...
UserRR's user avatar
  • 261
1 vote
1 answer
1k views

Li-ion vs Li-Po batteries cut-off protection

I am confused with the differences between Li-ion batteries (like 18650) and Li-Po (the flat ones). I know that basically they are both lithium ion, but when I want to buy I see that LiPos have always ...
ihavenoname's user avatar
1 vote
3 answers
3k views

Running a 12v fridge and protecting the battery from low voltage

I want to run a 12V (65W) fridge from a battery circuit on a boat. However, I want to protect the battery from being drained and potentially damaged by the fridge if the voltage drops too low so I ...
Paul Smith's user avatar
1 vote
5 answers
479 views

One battery slot kills its sitting battery

My kid has a battery-operated toy, it runs on three AAA batteries, connected in serial. Once, the toy suddenly stopped working, but all batteries were good. I decided to disassemble the toy and look ...
Hartwin's user avatar
  • 29
0 votes
1 answer
135 views

Abracon AB1805 RTC IC - additional resistance on VBAT pin?

I intend to use Abracon AB1805 RTC in designed device, powered by a CR2032 battery. IC datasheet contains a note: * Total battery series impedance = 1.5k ohms, which may require an external resistor ...
Tomasz Dzikuć's user avatar
0 votes
2 answers
2k views

What should a 12v solar battery read while in use?

I have a 12v solar system with 2 12v batteries (One marine, other a car battery). My inverter has a minimum voltage input of 11.0v and peak of 15.0v, but when I'm running it under load, I get a ...
Couch Mango's user avatar
1 vote
2 answers
3k views

How does the TP4056 overdischarge protection work?

I want to buy this integrated circuit (IC) to charge li-po battery. TP4056 Type-C 1S 3.7V It looks nice for charging but I am afraid of the overdischarge protection of this IC because in the ...
mehmet's user avatar
  • 1,139
1 vote
1 answer
689 views

How to use Voltage Supervisor and MOSFET to switch off ESP32 supply?

I am planning a solar project using following components: Solar cells 18650 battery TP4056 MCP1700-3302E TC54VN2902EZB Voltage Supervisor IRLZ44N and an ESP32 I have only seen a block diagram for ...
William Lucid's user avatar
0 votes
0 answers
39 views

Charger says 5-cell li-ion battery at 17.7 volt OCV dead or deeply discharged, what could the cause be?

I have a lawnmower with two lithium-ion batteries. I charged them after sitting during the winter period. One battery charged happily to 19.15 volt open circuit voltage (OCV), whereas the other had ...
juhist's user avatar
  • 1,842
0 votes
2 answers
723 views

What does it mean when a battery still has high voltage but doesn't deliver current?

All the dead batteries I tested had very small voltage and no current under load except one strange battery that had about 2 volts but no current. What causes this different type of dead battery?
user5389726598465's user avatar
0 votes
1 answer
374 views

How to use LBO on Powerboost 1000C as input for Arduino

I am using a project which uses an Arduino Uno and a powerboost 1000C. in the manual it says, LBO - not a leveraged buy out! this is the Low Battery Output. By default it is pulled high to BAT but ...
Jared Cohen's user avatar
1 vote
2 answers
998 views

Should I add an undervoltage protection for lithium battery-powered projects?

I am designing a board with a microcontroller (an ESP32) that will be in deep sleep most of the time. The board will run on a 1-cell lithium battery (not sure if I will use a Li-poly or a Li-ion). ...
DurandA's user avatar
  • 233
0 votes
2 answers
3k views

Reason why an inverter will drop the battery voltage from 24 to 10V after turned on and then immeadetly shut down?

I reacently modified an off-grid solar system, nothing fancy just included an automatic "turn on" switch for the Victron Phoenix 24/220 1200VA inverter. Then I connected the loads (2 computers, ...
Luis Miguel Guevara Hinojosa's user avatar
0 votes
0 answers
116 views

Is the SkyRC B6 Nano charger suitable for charging single 18650's from 2.4v-2.6v

I have salvaged six 18650's from a laptop we've owned for years. Battery voltage: four of them are ~2.63v, two are ~2.46v I have a SkyRC B6 Nano charger (https://www.skyrc.com/Charger/B6nano). I've ...
Adrian K's user avatar
  • 101
0 votes
1 answer
76 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 ...
user3439164's user avatar
1 vote
1 answer
1k views

6v battery low voltage cut-off circuit

I have a circuit that draw 150 ma and i use 6V/4Ah dry cell to supply. Voltage regulator of this circuit needs minimum 8V so I use boost converter to draw the battery voltage to 8 volts.This converter ...
7navy4's user avatar
  • 109
2 votes
3 answers
669 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 ...
serekani's user avatar
9 votes
10 answers
6k 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 ...
Dan Chaltiel's user avatar
0 votes
1 answer
512 views

PNP Transistor Switch for Relay

simulate this circuit – Schematic created using CircuitLab Hi, I have a low battery detection circuit here. When the voltage of the battery goes below 10.5, I have an LED flashing (Uses the ...
PhippsTech's user avatar
3 votes
0 answers
106 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 ...
Nathaniel Brochu's user avatar
2 votes
2 answers
1k views

Monitor coin cell voltage without loading it when power is off

Is there a good way to monitor a CR2032 coin cell's voltage, that does not load it down when other power is off? We are using a CR2032 coin cell for a battery-backed real-time clock. When main power ...
Technophile's user avatar
8 votes
1 answer
6k views

Is it normal for a lithium ion battery to read with a very low voltage on a multimeter?

I have a PS Vita and I suspect the battery is dead and needs replacing, as the Vita won't charge at all. But the issue could also be the charge circuit, as when plugging it in to charge the charging ...
Yoshi Walsh's user avatar
2 votes
2 answers
97 views

Deep Discharge of Cells and Batteries

This is a question related to What makes primary batteries leak on very deep discharge? What are the dangers of deep discharging a cell or battery? I've seen a LiPo battery getting puffy most likely ...
bot47's user avatar
  • 358