Questions tagged [discharge]

The process of removing energy from a store, such as a capacitor or battery. Stores may be parasitic, resulting in rapid spontaneous accidental discharge, as in a static shock.

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MOSFET gate failure caused by unknown reason

I have the below circuit (link to simulation). It represents the low-voltage interlock and high-voltage precharge & discharge circuit for my Formula SAE team's EV car. While most other FSAE teams ...
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Battery discharge rate - serial vs solo

Suppose I had two deep-cycle 12 V batteries wired as shown and pulled a constant current as shown from each of the voltage points. Would the two batteries discharge evenly? Why or why not?
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Need help understanding the behavior of solar charger and Inverter

I want to understand what happens when a solar charger is charging the battery while the inverter is also drawing a load from the battery. Say theoretically the charge controller supplies 10A and the ...
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3 answers
68 views

Discharge lithium ion battery to a specific state of charge

I am trying to make a circuit to discharge a 4s battery pack to 30% state of charge to ship it safely. I will be doing this from time to time and would like to discharge the packs rapidly (around an ...
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Calculating capacitor discharge time with constant current sink

To calculate capacitor discharge time the formula is: But because the current being sink from the capacitor is constant from highest voltage to zero volt, I think the capacitor should discharge ...
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NiMH reverse charged cells

I have a NiMH battery pack that I would like to balance (charge discharge for 3 cycles.) I am doing a low charge/discharge current of 0.5 A while the battery capacity is 5 Ah. Since the pack consists ...
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1 answer
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Why do I hear hissing sounds when I discharge my sealed lead acid batteries at high currents?

I've been doing some discharge tests in order to figure out the Peukert exponents of two sealed lead acid batteries with capacities 7 and 9 Ah, in addition to an initial current of 2.1 and 2.7 A, ...
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How can I quickly discharge a capacitor in a Zener on-delay timer circuit?

I have a project that requires using a delayed latching circuit. I found two circuits that I could combine, a on-delay timer circuit from TheEngineeringMindset and a latching circuit from ...
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Drawing more current from a battery than what it was designed for

I have built a system that requires at least 8A to run properly. It is powered by 6S1P li-ion battery pack protected by BMS circuit. I did some research and found that maximum battery current output ...
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Is battery charge efficiency related to its self-discharge?

I've read a couple of research papers and technical user manuals concerning SOC estimation, all of which mentioned both charge efficiency and Self-discharge but did not mention whether these effects ...
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Are vehicle electrical components powered from the negative side?

still trying to get my head around electron flow as opposed to conventional current regarding automotive electrical circuits. There seems to be a ton of conflicting information/advice out there so I'm ...
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Is it acceptable to connect a car battery and an AGM battery in parallel?

I power a 12V fridge in my car either via the car battery (when the vehicle is running) or via an AGM battery. There is an Anderson outlet in the car connected to the car battery to which I attach a 3 ...
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Discharging a capacitor into another capacitor via inductor

What would happen if you connect a charged capacitor (charged to V voltage) with another capacitor of same rating via inductor. What would happen ? Will both capacitors will have same voltage and if ...
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1 answer
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Capacitor current in parallel network with ESR and parallel resistance

So this might be a very simple question and I've got a knot in my brain but I've been at this for days and don't see how I could solve this problem. I'm trying to find the solution for both ucA, ucB(t)...
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TP4056 DW01A Problem

I have TP4056 with protection circuit. In charging, Everything is OK. OC : VDD - VBAT OD : VDD - VBAT While the battery is charging, the circuit continues to work on the battery when the charging ...
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Does a low-enough leakage-level battery discharge cause highly asymmetric cell discharge?

A Tale of Two Batteries This is concerning two different 6-volt lantern batteries that have behaved the same exact way (I believe.) Here is a datasheet for the type of battery, a Rayovac # 941 ...
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2 answers
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Weak edges over SPI data lines

I am developing a driver for an SPI temperature sensor, and having some trouble with poor quality edges near the end of packet on the data lines. While I am not experiencing any data loss, I am ...
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Relay delay LTSpice

I want to delay the time a relay turns off. I have made a simulation on LTSpice that simulates "how long" it takes for the relay to turn off. The relay is simulated using R2. I simulated the ...
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Output voltage of capacitor discharged in other capacitor?

Considering this circuit. How can I compute the maximum voltage across the resistor ? In this example, the capacitor on the left is initialy charged with 10 V. The second capacitor (on the right) is ...
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Not satisfied with 2.5 V battery protection shutoff. How to stop discharge at a safer voltage?

I have some of these lithium ion battery charging modules which are very commonly available online. They use a TP4056 charger and a DW01 protection IC. The DW01 datasheet says that it should cut off ...
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1 answer
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Spark generator current limiter

I am using a spark generator for electrical discharge machining and mounted a current transducer to read the current value of the arc between workpiece and electrode. When the electrode gets too near ...
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can we trade off electric power for time?

The voltage and current are exchangable for a constant power. Can we increase the power of the source by decreasing the time of the supply ? From this equation Power = Energy / Time The total energy ...
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4 answers
243 views

Circuit for controlled battery discharge to 0V

I have spent many hours looking through the Internet and this forum but could not find an answer to my question. Goal: I want to discharge a lithium cell from nominal voltage of 3.7V to 0V. ...
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What happens when a already charged capacitor is connected to a power supply with less voltage than the capacitor?

I am trying to figure out what exactly happens to the capacitor with 50 V when we connect it to a power source with 25 V. It probably discharges but I am wondering at what rate it stabilizes and at ...
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1 answer
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Why are lead acid battery cutoff voltages inversely proportional to discharge time and is it OK to discharge down to 1.6 Volts per cell at C0.25?

I'm sorry if this is an obvious question, but I've been scratching my head with it for a while. I am used to UPS backup batteries that have an autonomy time between 2 to 4 hours, so I have always ...
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UART IO not working, placed multimeter to measure voltage and IO began working instantly - why?

We are a bit stumped on this and wanted to see if anyone had any experience or perspective on this. Description of Event We are communicating via UART from a 3.3V processor to a Sim7000G (1.6-1.8v). ...
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Prevent capacitor discharge after it was charged using a microcontroller

I want to use a micro-controller (like an Arduino) to: Charge an external capacitor Measure voltage across the capacitor Capacitor discharge rate as low as possible. Capacitor discharge rate while ...
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Calculate capacitance needed to actuate a solenoid one time

A 1.2W solenoid has to be actuated for 500 msec, using only a (pre-charged) capacitor. The solenoid voltage range is 4.5-6 V. I have to calculate the needed capitance. https://www.engineeringtoolbox....
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TP4056 - Charge while load is used with Zener diode

I'd like to add a zener diode to my tp4056 in order to be able to use the load while the battery is charging. Context: I found this post that looked promising however I lack electronics knowledge and ...
1 vote
1 answer
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Determining discharge curve of capacitor with I(V) curve

I have a 1 F double layer capacitor in a circuit supplying power to a micro-controller and an RTC circuit. I will be measuring the I(V) from 5 V to 0 V Is there a way to predict the discharge curve, ...
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Efficient discharge of capacitor voltage to 2-10 ohm DUT

I need to apply the voltage in a capacitor to a load (between 2 and 10 Ω) and need to have the most efficient and simple method to do so. The goal is to apply power to a DUT (device under test), ...
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What is the maximum DOD for a Li-Ion Battery?

I bought these 4.8 AH, 3.7 V - 4.2 V lithium batteries that came without a datasheet and I didn't manage to find it anywhere on the internet. Can someone figure out its maximum safe discharge voltage ...
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Diagnose battery drain in small appliance [closed]

Novice here, wondering of any "low hanging fruits", very simple initial checks that one can do to find out why a small, AA/AAA battery-operated appliance is draining them faster than it's ...
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What resistor is needed to discharge a capacitor of about 3kV (inside a microwave)

I've already made a capacitor discharge tool for a 300V capacitor and works fine using the 2 resistors that were on the PCB with the capacitor. I need to upgrade this to discharge a microwave ...
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Protection circuit module for not only “deep” discharge protection

I have to ask about protection circuit module, like BQ297xx, AP9211, AP9101 etc. As I see, protection circuit module is used to protect li-ion cell from deep discharge - so if the li-ion cell has, for ...
1 vote
2 answers
137 views

How to calculate the discharged current of a capacitor from the discharge curve?

I observed the discharge of a capacitor on an energy harvester chip via an oscilloscope. The Output was used to power a BLE module. I know the capacitor value, discharge time, and the top and bottom ...
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1 answer
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AA primary batteries in series and parallel configuration

As shown in above image we are using two AA alkaline batteries in series and two in parallel. Each battery is 1.5 V and 2700 mAh in capacity. So in above configuration total battery voltage would be 3 ...
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3 answers
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Equalize batteries

I have two (2) 12V, 7Ah SLA batteries. I want to use them in parallel to support my load. I am not sure about their charge state. How do I equalize them to same voltage and current so that my ...
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2 answers
275 views

Bleeding resistor high voltage high efficiency

For a design I am working on a wind energy control circuit. The circuit has a maximum voltage of around 450 Vdc. When powered off, I believe it is safe to discharge the capacitors through bleeder ...
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1 answer
156 views

Battery voltage measurement

I am using a charging and discharging circuit to do operations with a Li-ion battery. When I charge the battery at 4.2V rated voltage and at 1 ampere current, I want to continuously measure the ...
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2 answers
470 views

How to calculate mAh draw from a battery?

I'm trying to calculate the "drained" capacity from the battery each second so I can get the nearest possible capacity used. This is how I'm getting this. dischargingCurrentSum - Is the sum ...
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2 answers
143 views

Capacitor voltage function

How would you find the mathematical function of the voltage discharge curve for a capacitor considering the following circuit and conditions: When time t=0, the capacitor is fully charged with the ...
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2 answers
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Lightbulb powered with batteries

I am powering a 12V 6W lightbulb with two 9V zinc-carbon batteries in series. The voltage should be high enough to power the lightbulb, but the light is only visible for around 40 seconds before it ...
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Capacitor discharge from one pin. Is it possible?

According to circuitry rules nothing should happen when we connect the probe in following schematic but it doesn't make sense for me. The capacitor must be discharged. What's the reality?
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SOC (state of charge of batteries) for LiFePO4

I am trying to find the state of charge (SOC) of some batteries I have 3 LiFePO4 batteries, these are the ones I have purchased: https://www.ampsplus.co.uk/ampsplus-14500-3-2v-500mah-battery-button ...
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Charge settings for hybrid battery module

I am currently overhauling and replacing worn battery modules for my Toyota hybrid vehicle. I have purchased a SkyRC q400 smart charger to charge all the six cell Nimh modules before I assemble them ...
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1 answer
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What is the charge flow between a charged capacitor and an uncharged capacitor connected in series

What will be the charge on both the plated after bc is closed? (Imagine that both the C1=C2=C)
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Lithium discharger with what I have laying around the house. Review pls?

I'm trying to MacGyver my way around discharging some lithium ion cells down to a set voltage I can safely store them for maximum life. My main issue was I don't have a decent voltage reference as low ...
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1 answer
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Capacitor discharging time [closed]

What is the time needed for discharging, when a charged capacitor is connected to an uncharged one in a circuit along with an AC voltage source? Since a lot of people asked to give more information ...
1 vote
1 answer
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Automatic capacitor discharge circuit

I need a (preferably analog) circuit to monitor a solar cell trickle-charged capacitor and automatically discharge the capacitor when it's charged. The idea is to use solar cells to power small ...

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