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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60 views

Ratio Between Voltage and Charge

Is there a ratio between the voltage and charge of a battery? I mean, the voltage falls slowly while the charge is consumed? Or occurs a sudden drop of voltage when the charge is at the end?
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36 views

Use a steel welding table to ground yourself from electrostatic discharge (ESD)?

I have a large steel welding table that I have been using as a work station to solder together my own custom PCBs. I have been using my anti-electrostatic discharge grounding bracelet and connecting ...
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1answer
33 views

discharge of capacitor through a current source

Assume we have a cap connected to a current source that draws a current \$I_0\$. What time would it take to discharge the cap by a voltage \$V_t\$? $$t=\frac{C \times V_t}{I_0}$$ Is this correct ...
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42 views

How to maintain equal discharging on batteries

I am currently building a robot that has one 12V battery for each drive motor. The system was originally setup so that the two motor/motorcontroller/battery systems were completely separate. After ...
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1answer
92 views

Why does a IRFZ44N turn fully on on my battery discharger while a IRFZ46N doesn't?

I've made a simple MCU controlled NiMH AA battery tester a while ago and it works just fine. The schematic below is its discharge circuit for one NiMH AA cell. Q3 is a IRFZ44N MOSFET. Signals ...
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2answers
57 views

Are BLE modules capable of working with a CR2032 battery? [duplicate]

I keep reading that the Bluetooth Low Energy modules are capable of working with a CR2032 battery for years, but their consumption is around 20mA and the max discharge of a CR2032 is around 3mA (200uA ...
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1answer
69 views

Battery Discharge

I am making a circuit to discharge an 18V Li-ion battery, with multiple cells, in order to condition it. Each 18V cell has a capacity of 100Wh when fully charged. I would like to control the condition ...
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2answers
220 views

How deep should we discharge lithium batteries to maximise their lifetime?

Recently I posted an answer mentioning the very classic "lithium batteries like partial discharges, so design your system for limited depth of discharge". But then I wondered: with partial discharges, ...
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1answer
176 views

Arduino and N mosfet lithium battery charging/discharging measuring capacity

I need an Arduino based lithium battery tester that uses N channel Mosfets to switch On charging from and external power source and discharging through a 2 Ohm resistor. I have no issues with either ...
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1answer
83 views

Max discharge rate of Alkaline AA batteries?

I'm in a bit of a tight situation, as I need a new battery pack for an upcoming competition, so I've tried to make my own. I put 7 of these: ...
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1answer
61 views

Natural discharging duration of an unpluged capacitor

Can natural discharging period of a charged capacitor be detected by a certain formula? If it is related to initial voltage and the internal parasite resistance, what are the factors affecting this ...
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1answer
50 views

Capacitor and discharger selection for pulse discharging

I want a 100 Joule pulse in 350 micro seconds. I have 1000V nbu 1012 capacitor discharge circuit . In datasheet, Max. average power is 3000 W(page 8), however I need 100/350us= 285kW instantaneous ...
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231 views

How to properly discharge a high voltage capacitor?

I have recently blown a capacitor on my home made emp. I have got the perfect replacement which is an electrolytic capacitor, 330v, 140 micro farads. I have charged it but I want to learn how to ...
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82 views

About battery capacity and regulation

For a portable application, I would be using a single 3.7V 2600mAh li-ion cell. The circuit requires 2.5V to 5V to function with the current requirement being 100mA. So obviously a voltage regulator ...
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1answer
119 views

Modeling Capacitive Discharge Ignition (CDI) Circuit

I am trying to model a capacitive discharge circuit (see Fig. 1 below), but I'm having difficulty properly coupling the two inductors on the transformer and also estimating the energy dissipated ...
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2answers
129 views

Capacitors not keeping charge as expected

I have a voltage doubler charge pump that is used to provide voltage over an IR LED for a short pulse, I also have a driver circuit for the LED to sink the right amount of current that I am requiring. ...
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1answer
84 views

What external factor could cause increased current draw?

I have a metal cased device powered by 2x 1.5v AA batteries with a standby current draw of 19.7 microAmps. If I then cause a build up of static by shuffling across a synthetic floor and touch the ...
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54 views

Effects of C Rating on Battery Life

A polymer lithium ion battery is rated at 3.7v, 6600mAh and a maximum discharge current is specified at 3.3A. I take it this means the battery can be discharged at 3.3A and last for two hours since ...
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1answer
61 views

How can I use the presence or non-presence of an 120VAC input to actively discharge a bias power rail?

I'm designing a power supply that has an input of 100VAC to 300VAC. On the primary side on the main transformer, I have a 15V rail to power the control chip (a FAN6920) and a gate drive chip (a ...
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1answer
76 views

How will unmatched lithium-ion cells in parallel react?

We are stocking a portable power pack for USB charging. We tested them when they first arrived and found no issues but after 3 months we tested some of the remaining stock and found about 50% of them ...
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0answers
60 views

Li-SoCl2 battery state of charge

I'm developing a data logger powered by Li-SoCl2 (http://www.100y.com.tw/pdf_file/02-SAFT-LS33600.pdf) battery and I have no idea on how to overcome the problem of estimating the residual charge of ...
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1answer
96 views

Why is there heavy oscillation in my capacitor discharge circuit and is there anyway to fix it?

I have the following capacitor discharge circuit: simulate this circuit – Schematic created using CircuitLab When solving for the voltage across the primary and secondary inductors, I ...
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2answers
1k views

What is a safe max. discharge rate for a 12V lead acid battery?

I've got a 12V 2.4Ah lead acid battery which I plan to connect a water pump to. I've looked at various pumps, but the one I'm most interested in draws 2.2A. I'm not so interested in how long the ...
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2answers
125 views

Where does power in my laptop go when I disconnect the battery? [closed]

I have a laptop which, when put to sleep, sometimes enters a state of limbo, from which it can be neither turned off nor on, and the only solution is to disconnect the battery, reattach it, and turn ...
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1answer
52 views

Flash Bulb battery depletion

Extremely simple question for you. Probably beneath all of you to answer apologies for that. My camera's flash is rated in Watt seconds. My battery is rated in mAh . If my battery can output 1000 ...
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0answers
87 views

Corona discharge of a ring

As far as I know corona discharge usually happens when there is high electric field or when the object that stores charges has sharp points. Would corona discharge still happen if we used a circle ...
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1answer
46 views

Mobile Battery Charge

I just wanted to ask whether it is possible to voluntarily discharge a mobile phone's battery and transfer it onto another battery?
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67 views

PKZ 1023 Battery

Does anyone happen to know the manufacturer's specs for the PKZ-1023 model battery? All I know right now, is that is that it is NI-MH, 9.6V, and 1000mAh. I was hoping to find a chart of discharge ...
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1answer
63 views

Lead Acid max discharge rate?

I am building a flashlight using a large(ish) 35W HID headlamp from a car, and I'm having troubles choosing a good battery technology. The inverter draws about 3.5A - 4A at 12V, tested on a large ...
2
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1answer
185 views

Discharging electrolytic capacitors

I believe that capacitors are safe to discharge through a short, if the voltage is not high enough to cause a dangerous spark; and the energy stored in the capacitor (E = V × Q = V² × C, if I'm not ...
2
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1answer
80 views

Gas Discharge V-Q Lissajous

I've been investigating non-thermal plasmas, specifically dielectric barrier discharges, where two electrodes, at a potential difference of several kilovolts, are separated by a dielectric and a gas ...
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0answers
46 views

Current Return Path for Plasma Experiment

I'm planning to use an old non-GFI neon transformer to produce plasma for some research I'm conducting. However, the neon transformer is center-tapped which complicates diagnostics (such as ground ...
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1answer
98 views

How to calculate Li-Po battery discharge time?

I want to calculate the time for a Li-Po battery (7.4 V, 2200 mAh, 30 C) to discharge. Battery powers up an embedded device, that requires 5 V, 147 mA. For this reason, I use a voltage regulator, in ...
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1answer
138 views

Removing neon transformer center tap?

I have recently acquired an old neon transformer (rated 12kV) for conducting some low temperature plasma experiments. It is the mid-point grounded style with a center tap on the secondary coil. I had ...
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1answer
356 views

How exactly does a capacitor discharge its charge?

When an empty (discharged) capacitor is connected to a battery, it slowly charges up as one plate fills up with electrons, while the other plate has electrons drawn away from it towards the positive ...
2
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2answers
43 views

Internal resitance of a battery and SOC related?

How do you find remaining SOC of a battery, say 12V 100 Ah? Is it possible by monitoring internal resistance of the battery? Or is there any better way (logic wise) used in industries? I'm using an 8 ...
3
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2answers
193 views

What makes a device intrinsically safe?

I work in possibly gas filled environments. As such safety recommendations are that I don't use my cell phone, camera and computer while touring around these areas that explosive gas may be present. ...
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1answer
110 views

Maximum load current that is still indistinguishable from battery self-discharge

I am designing an electronic device that will be powered by a battery, and I am trying to keep my device's current draw in standby to a minimum. Specifically, I would like to keep the current just low ...
6
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2answers
3k views

What is 1C charge/discharge rate in battery instruction manual?

Instruction manuals and discussions mention battery charge and discharge rates in terms of "1C", "2C" and so on, without giving an indication of what "C" is. I presume it is not a Coulomb. What is ...
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1answer
139 views

Why discharging static to laptop's VGA ground is more disruptive over a pencil then directly?

When I touch a laptop's corner, USB or VGA port ground with finger, the resulting spark seems not to affect anything. However I've just tried touching the VGA port's outer ground with a pencil ...
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232 views

How to calculate time for NiMH batteries to discharge?

I want to use 4 battery cells AA NiMH (or NiCd) 1.2 V, 2600 mAh in order to power up circuit that requires 5 V, 300 mA. I know that fully charged NiMH can provide 1.35 V each, which means 5.4 V in ...
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3answers
442 views

Why charging time is same and discharge time is different for two inputs in dual slope integrating ADC?

For different input voltages in dual slope ADC, charging time remains same but discharge is proportional to the magnitude of the input voltage. How it works in that way ? Charging time is independent ...
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0answers
104 views

Discharge limit on a 12V 9800mAh Lithium-ion Battery

I am running a 12V solar system that powers a 5050 LED light bar of 7.4W. Powered by a 25W mono PV and has a total 12V storage of: 1x 6800mAh 1x 9800mAh (Lithium-ion batteries in series) The ...
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2answers
62 views

Grounding a conducting object

Is it possible to trap some electricity in the object even though the object is grounded? For example if we ground a conducting sphere over a resistor, will all electricity leave the sphere once it's ...
0
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1answer
156 views

Capacitor discharge math discrepancy

I'm trying to cross check mathematically the mA being discharged from a .33uF capacitor which is charged to about 1200V by a circuit which is provided 37W of power to it. I do it three ways. 1) ...
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1answer
146 views

Safely discharging large value capacitor without blowing it up

This is related to my previous question. I have this circuit in which I discharge the capacitor by turning ON M2. The ON resistance of the MOSFET I have in mind (the picture shows the wrong MOSFET in ...
3
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1answer
316 views

Discharge curve of a LiPo battery

What is the mathematical formula to calculate the voltage of a (typical) LiPo battery as a function of it's charge, current flowing and external temperature?
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1answer
326 views

How to measure battery charge and depletion over time

When using my various electronic devices, they always seem to know how much charge is left in the battery. They also know when the battery is completely charged. Not exactly sure how this is ...
2
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1answer
146 views

Preventing Arc Discharge

I am repairing some ozone generators and one of them has a tower with a discharge path I can't seem to get rid of. Back in the heyday of television, my dad ran a side (hobby) business repairing bw ...
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1answer
125 views

Static electricity discharge, what gets transfered?

Ive been studying Maxwell equations at school and I solved several excercises regarding electrostatic fields, however I still have some very basic unanswered questions: When a non conductive object ...