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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21 views

How much heat is generated by a Li-ion Phosphate Battery during discharge

I am designing an enclosed container with 10 kVAh, 50 V battery in it which requires me to actively remove the heat. My research appears to indicate an internal resistance of about 320 mΩ to 340 mΩ ...
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51 views

Electrospray Deposition

I recently got a new project to work on, an Electrospray Deposition setup. Basically, it consists of a needle that contains a liquid, a electrode and a high voltage source. The needle is positioned at ...
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Shorted 18650 Li-Ion Batteries

I accidentally shorted three 18650, 3700 mAh batteries connected in series for about 2 seconds. I measured each cell individually with a voltmeter and they read very close to its original rated ...
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57 views

To (almost) fully discharge a rechargeable NiCd battery

How to fully discharge a rechargeable NiCd battery the easiest way till at most 0.7 V? I.e. by whatever means/method on our daily/natural hack not requiring any expense/device made to specially ...
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41 views

Battery Charging and Discharging rate

I did some calculations for hybrid renewable energy system and I calculated the energy from PV and Wind. Then I modeled a battery for both the PV and the Wind energy systems. I found that energy ...
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38 views

Frequency of the standard battery discharge curve

What can we say about the frequency of the discharging battery? You know that batteries, for example Li-Po, have a characteristic charge and discharge voltage curve. And under a certain rate of ...
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65 views

How do safely discharge Li-Ion batteries to check full capacity

I regularly have to test old phone batteries in my mobile phone refurbishment business. I need a safe solution to discharge 3.6V batteries. When I buy batteries they come from old stock so I need to ...
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48 views

Relationship between depth of discharge and energy efficiency for a Li-Ion battery

Consider a lithium ion battery that is continuously cycled at different depths of discharge (say, 20% vs. 40% vs. 80%) and at a constant c-rate: It is well known that the larger depth of discharge ...
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102 views

How do I safely discharge a 3900 pF 3 kV (and 9 kV) capacitor?

I am planning to built a circuit with 3 polypropylene film 3900 pF 5% 3 kV DC radial capacitors connected in series. Before I start this, I want to make sure the capacitors are safely discharged. I am ...
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126 views

Why should I put a Schottky diode and a resistor between a USB connector and a TP4056 charger IC?

I've found this useful explanation for a load sharing circuit based on the established TP4056 charger IC: LINK: https://www.youtube.com/watch?v=T70mBHeIOZA&ab_channel=WellDoneTips SCREENSHOT: Now ...
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35 views

Handle simultaneous charge/discharge with a BMS

I am building a series of 13s LiPo battery packs, each with a BMS with B- P- and C-. They are to be charged with a regulated source from a PV array. I know this likely depends on the specific BMS, but ...
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123 views

Can an electrolytic capacitor discharge through its top?

Can an electrolytic capacitor discharge through its top? Is it potentially dangerous to touch a large electrolytic capacitor on the top if fully charged?
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38 views

3S Lithium-Ion power solution for a project

I have a PCB that runs on 12V throughout the day and consumes 2.3A. The power is supplied for 12 hours using a power supply. The other 12 hours it must run on batteries that have charged during the ...
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29 views

Discharge rate of a motor run capacitor?

I have a capacitor on a pool pump, specs : Motor Run Capacitor Round 30 uf MFD 370 Volt VAC 12717 As I understand even with electric circuit the pump is on turned OFF, the capacitor can still carry ...
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Can I connect a smart charger to a lithium battery with a BMS

I have several tools with NiCad batteries which are failing due to the age of the batteries. I refuse to throw these perfectly good tools away and wish to convert the batteries to lithium. I HAVE ...
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35 views

Using discharge protection, BMS and balance charging?

I am building a small high quality headphone amp which needs power supply +/-7V up to +/-17V. According to the manual it uses maximum 200mA. I like to use 2 x 3 16340 rechargeable lithium batteries ...
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52 views

NiMH battery discharged to 0V

I have a 90's handheld CB that I'm powering using 10x1.2V NiMH cells all in series. Because these cells are rather old (at least 8 years), when I got a low voltage warning, I decided to measure all ...
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298 views

Current limiter circuit is damaging MOSFETs

I have a circuit where a charged capacitor must be discharged over a load resistance. The trigger switch here is a 10A relay so, to avoid damaging it when the load resistance is too low, I decided to ...
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63 views

How to prevent a Lipo/Li-Ion-Battery from catching fire after a complete self discharge with a following accidentally recharge

From the following Youtube video (at 3:15min) I got that it is dangerous to recharge a Lipo/Li-Ion-Battery after it was completely discharged (0V), because it will catch fire. https://youtu.be/...
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80 views

Derivation of Discharging Current of an Inductor

Consider the following circuit: When \$t > 0\$, the inductor \$L\$ begins to discharge. I already know from KVL that the sum of voltage drops in the loop containing the inductor is: \$L\frac{di(t)}...
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151 views

Discharging a capacitor through a depletion MOSFET

I´m building a device to remotely operate a solenoid through a data link. That device, which is powered by a 9V battery, has a step-up circuit to raise the battery voltage to +- 160V which, in turn, ...
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52 views

i have problem with capacitor discharge ignition circuit CDI

i have a hard time to understand what is the problem in this circuit, can someone help please, i have a Moped with its capacitor discharge ignition Box work fine, the spark exist, but i wanted to make ...
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32 views

Battery discharge tester

How to dynamically adjust the load using a MOSFET for a battery discharge tester? All I need is to vary the gate charge of a MOSFET. For the final results I need to monitor the constant current ...
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84 views

Does load resistor value in constant current setup affect power delivered from source/battery?

I am bulding a battery pack of 48v using 18650 cells salvaged from laptop batteries. I have to test them for their capacity to use in my project of converting bycycle to electric. So i have couple of ...
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35 views

Vehicle battery (NMC) max discharge rate

I wanted to understand a few things related to secondary batteries:- Do the secondary batteries not have any limit on how much current we can draw from them? a. I understand that we have a limit on ...
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Li-ion charge / discharge circuit with ESP32 and MOSFET

Here is what I’d like to do: Wire a circuit that can either charge or discharge a single li-ion cell (3.0 to 4.2 V) or just do nothing at all. An ESP32 controls the circuit (max. 3.3 V). An INA219 ...
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64 views

RTC circuit supercapacitor charge/discharge doubts

This is my current RTC circuit... Supercapacitor = DXJ-5R5V334U (ELNA)... DXJ-5R5V334U = 0.33F, 5.5V, ESR = 150 Ohms Resistor = 150 ohms 0603 100mW 1% If I consider only the resistor, I have a RC ...
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Modeling the discharge efficency of grid connected energy storage systems

Short form A battery has a charge and discharge efficiency of \$95\$%. The initial SoC is \$3 \text{ MWh}\$. It charges for an hour with \$1 \text{ MW}\$, then discharges for an hour with \$1 \text{ ...
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87 views

can I charge battery at the same time as using it if it is the new usb c pd

Sorry for such a newbie question. I am still trying to find my feet. I know that a battery cannot be charge and discharge at the same time as I find this: No, a battery can't be charged and ...
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58 views

Gas discharge tube load type

I can not find any information about the type of load of neon lamps, for example neon probe or wall contact plug or extension cord with switch with small red lamp. I think this is a passive capacitive ...
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48 views

Measuring Discharge Rate of LiPo battery

I am attempting to change the temperature that a 3.7v rechargeable LiPo Battery is discharged in and am seeing how this affects the capacity and discharge rate of the battery. My setup currently uses ...
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How do I safely discharge this Trinitron CRT when the HV connector seems glued on?

I'm trying to discharge a Sony PVM-1353MD which suffered shipping damage. Unfortunately, I am unable to get my tool under the HV connector. It seems bonded to the CRT with some kind of white silicone ...
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Discharging 18650 at higher Peak-Amperage than rated max continuous Amperage?

I am using Sanyo NCR18650BL cells. They are rated for 7A max continuous discharge, but i could not find any info on temporarily discharging them at a higher rate (for example 10A per cell). Is it ...
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41 views

Is there a relation between the voltage of a Li-ion battery and its charge?

I have a Li-Ion battery-powered device (Wemos, an ESP8266 based) and I can read information about the voltage applied to its input. Is there a relation between this voltage and its remaining charge?
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What electrode material can I use for electrical discharge machining? [closed]

Can I use an electrode made of melted soldering wire in electrical discharge machining (EDM) instead of copper or graphite? I think it is very easy for me to make electrode by using melted soldering ...
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124 views

How does the continuous/peak charge/discharge current change when combining cells with known values in series / parallel arrangements?

Example 16 identical battery cells rated as below: 3.2V 100Ah LiFePO4 Max Continuous Discharge 100A / 1C Max Peak Discharge 200A / 2C for 100s Max Continuous Charge 50A / 0.5C Max Peak Charge 100A / ...
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52 views

Time interval quantized?

We have a capacitor fully charged with some voltage. At t=0 we can find the current. This current will change the voltage of the capacitor. However the information of the change of the voltage of the ...
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75 views

Finding practical solutions for discharging and charging a capacitor

I am wondering can I charge and discharge a supercapacitor at the same time like a battery. I have 1.3V going into a 10F 2.7V capacitor in series with a 0.5 ohm resistor. I calculated it will take ...
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183 views

max Discharge current of li-ion battery (temporary)

Is my assumption correct that the main limiting factor of maximum discharge current of a Li-ion battery is that the cell heats up too much due to its internal resistance/the current flowing through ...
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67 views

Pull away voltage (energy) from a DC motor driver board when it does regenerative braking

I have 200 BLDC motor (six-step) driver boards. They work fairly well but, when I tested them on a heavy load (2500 kg), I discovered that they struggle when braking the motor. The PID algorithm can ...
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How do I conduct an experiment to find the discharge curve of a lithium ion battery?

I want to conduct this experiment with a multimeter only. What sort of load do I put? I used a Sony Li-ion Np-BPL battery model and after full charge, I put the battery across a load of 1k Ohm; ...
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110 views

What is the purpose of this coil in a medical defibrillator?

Please can someone explain the function of L coil in this circuit? This schematic is just medical defibrillator, but almost every capacitor discharge circuit has some series coil. Is it some kind ...
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64 views

Calculating capacitor discharge time constant with dc source and constant current source

I have a 1.8V dc source with 40 ohms series resistance, which models a battery. In parallel, there is a 10uF capacitor. At t<0, the mosfet is off and there is no load delivered to the output, so ...
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28 views

Voltage monitor when discharging

I am trying to make a discharge system that use 2R2 resistors and relay to engage the system, until here everything is fine, I can trigger the system and discharge the battery. I thought, that I ...
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175 views

How to fully discharge supercapacitor?

My biggest problem is when I discharge a supercapacitor, let's say 100F 2.7V, I use a boost converter, but all boost converters have a minimum input voltage of about 0.9V. But the capacitor still has ...
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56 views

Deep Discharged Primary Battery Pack Voltages

I deep discharged two 4 cell (2S2P) 7.2 V Lithium Thionyl Chloride battery packs each connected to a GPS tracker. I ran the two packs until each GPS tracker stopped communicating. (can't be certain ...
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64 views

swapping the ground reference on a transformer's secondary winding

I'm looking to build a [simple] high voltage power supply in order to make electrets via corona discharge. I'd like to be able to fabricate both positively and negatively charged electrets using this ...
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81 views

What is the best general purpose variable resistor in a battery discharge circuit (10V < Vbat < 50V)?

this is a very specific question and i'm unsure if this is the right place to ask. I am constructing a battery discharge circuit. The discharge circuit specifications: To be able to discharge ...
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44 views

How can this high-side IGBT drive work without exceeding maximum Vg-e

I was reading an article that creates a device that model the I-V curve using on capacitive loads. In the article they using IGBTs to charge and discharge the capacitor. This is the circtuit that ...
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82 views

Calculate time it takes for a capacitor to discharge, when it is applied to VGS of a transitor

I want to usea 1uF capacitor to create an electric field between Gate and Source (VGS applied to dielectric) of a transitor. simulate this circuit – Schematic created using CircuitLab Since ...

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