Questions tagged [battery]
The battery tag has no usage guidance.
33
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Is there fire suppression in some phone batteries, and if so, how does it work?
I recently saw a rugged smartphone, three or four years old, with a ~5000 mAh battery, suffer a major impact to its back. This wasn't a fall, it was a fast impact with a heavy object. Immediately ...
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Are two solars panels more efficient than only one of twice the power output?
Is there any advantage to use two 50 W solar panels in parallels instead of one 100 W panel?
As we know, the effect of partial shadow on a solar panel can make the whole panel ineffective. We want to ...
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AGM battery float voltage
It is a fact that AGM batteries are typically charged with higher voltages, compared to the other lead-acid batteries (flooded and GEL).
I don't understand the reason for this, is it related to the ...
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Why 'battery storage power stations' use mainly liion batteries?
As I understand liion batteries have lower lifetime, than LiFePO4. Why would such big stations use liion batteries then? Wouldn't replacement cost large amount of money? And how long those liion ...
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Why are phones not getting charged when I supply 5 V and 0.3 A?
I'm using thermoelectric module to get the voltage. With the help of it, I'm getting 3 volts Open circuit voltage. I've attached DC-DC converter which regulates this voltage to 5 volts. I've attached ...
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Batteries AA - industrial R6 vs normal LR6
I have the following issue:
One year ago or so I bought a toy for my kid. Worked fine, then the battery got low (still working though but under performing). I checked the battery type, see is an AA (3 ...
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Resulting pressure of batteries in series
Hi everyone we are working on a battery project and have the following question. What is the influence of stacking battery cells next to each other in a battery module on the resulting pressure ...
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Need help for Fire Detection System design
As a Building Services Engineering student, my current project involves the design of fire detection system of a newly-installed at-home EV charging system. The EV chargers are installed in the ...
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Trying to understand Nathan Stubblefields 1898 American Patent #600,457
I find this solenoid to be intensely interesting. It has a number of unique properties:
The coil wire is made from dissimilar metals so that the voltage is internally produced in the coil.
The ...
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Heat generation mathematical model for Li-ion battery to design a BTMS
I have decided to work on a project in which I have to design a hybrid battery thermal management system (BTMS) for which I need to first model the heat generation from Li-ion batteries. Therefore I ...
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I would like to run a smartphone using a primary battery instead of rechargeable for a project. What are the 4 contacts used for on the factory LiPo?
Most phone batteries will have a connector of some type with 4 contacts. Of course two of those I'd expect to be +- Voltage, but the other two compose some sort of mystery input to the phone (...
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Charging a Li-po battery (battery output current)
I would like to design a buck converter to use a PV panel to charge a 11.1V 3000mAh 3S 30C Lipo battery.
I want to choose the minimum inductance for a CCM ($L=\dfrac{V_{out}T_s}{2I_{out}}$), what is ...
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Seeking Assistance with Solid State Relay and Arduino Nano Power Failure Solution
This is my first time, and I'm looking for guidance on my approach to a particular problem: ensuring that a Solid State Relay (SSR) closes whenever my Arduino Nano loses power. The SSR, powered by the ...
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Increasing energy density for flow batteries with water based electrolyte?
Given a flow battery with a water based electrolyte, would it be possible to increase the energy density of battery by precipitating the redox active species from the anolyte and catholyte solutions? ...
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Connecting Busbars Safely
I would like to design a 500-700V battery system such that I can laser weld a subset/module (i.e. a building block of ~12 cells each) with an open terminal on each end. This way, I can jump the ...
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For Electric vehicles, HOW are miles per gallon equivalent (or L/100 km) are calculated, accounting for different sources of energy in the grid?
Could someone giver a clear and authoritative answer on HOW miles per gallon equivalent (or L/100 km) are calculated for battery electric vehicles like the Tesla Model 3 AWD long range?
On the ...
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What are parameters are to be considered while selecting Battery Management System?
what are factors to be considered while selecting bms? Does the BMS required change with cell chemistry and cell geometry? if yes, how does it depend. and also How do we determine the placement and no....
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Why does the battery life of my iPhone last longer when charged with the USB port of my laptop?
I have an iPhone 12 that's currently at 88% battery capacity. I've noticed that
when I charge it through the USB port of my laptop it lasts way longer than when I charge
it through my charger.
Here's ...
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Convert a 3 poles AC/DC battery charger into a 2 poles DC power supply?
I have a battery charger with a positive pole, a negative pole and a common pole, see the below diagram.
The output voltage is as follows:
positive-common 5V DC
negative-common 5V DC
positive-...
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Why do Nickel Manganese Cobalt batteries wear out before Lithium Iron Phosphate batteries?
Do NMC batteries lithium plate faster? Does the Solid Electrolyte Interface (SEI) grow faster on NMC batteries? Do they heat up more and therefore the SEI grows faster? Does the Iron stabilize the ...
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Is it safe to leave a power bank connected all day to a 10 W solar panel (so with varying voltage and current)?
I have a 10W Solar panel with 5V USB output and a few power banks (the one I'm willing to risk for now is an older Li-ion one rated 3.7V/6000 mAh/22.2 Wh with microUSB-in 5V 1.9A max).
My question is ...
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Detection of Li-ion battery
Can anyone explain how Li-ion battery are detected at airport security checking, and would it create any difference if the battery is discharged.
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Compressor ratio and addition of battery cooling loop (chiller) in the existing HVAC circuit
Imagine if i want to change my IC car to an electric vehcile, with the obvious addition of battery, how can i use existing HVAC loop to cool the battery using a chiller. HVAC was obviouly desinged ...
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Backing up a welder's power source with lead acid batteries
I'm thinking of purchasing a MIG welder sometime in the future. Given, the ordinary mains cannot supply the power. So I would have to plug it through the dryer's outlet, with some adapter & ...
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LiPo drone battery first charge voltage rate
Does a LiPo drone battery need a specific voltage rate for the first charge?
If so, how much voltage does it need?
Thanks.
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Rechargeable battery engineering: crystal nucleation and rough cut/stamped plate edges
I'm a tech hobbyist, I'm not an engineer, I'm just a IT tech guy that edits Wikipedia and answers tech questions for fun. I am aware that pure solid nanocrystal formation is the primary cause of loss ...
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How to lock a door using a battery-powered lock, without an outside handle?
Scenario:
Door has a flush outside, without any knobs or handles. The door is opened by pushing it. When the door is left un-pushed, the door closes itself as there is a door-closer arm attached to ...
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At what interval should batteries be replaced in a remote controller used for security purposes?
I have a few remote controllers hidden around the house. One is in the bathroom. If the front door busts in and cops scream at me while I'm sitting on the toilet, I can press the button on the ...
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Can self-discharge cause a Li-ion battery to swell?
Suppose a Li-ion battery, with a polymer electrolyte, is left unused for a few years with no load connected. Can self-discharge alone during this time cause any gassing in the the battery?
If yes, can ...
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Mecanum wheels begin to make robot spin around rather than move to the side
I am using mecanum wheels to steer my robot which I am programming using an arduino. The main problem that I am having is that whenever I attempt to make the robot move sideways like this:
Instead ...
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Can a Tesla Powerwall 2 be rate limited?
Can a telsa powerwall 2 be rate limited (discharge/charge)?
I have access to realtime electricity rates (30 min update interval) and also access to 12 hour predicted look ahead. So I wish to limit ...
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Best way to communicate data wirelessly with specific conditions
So I need two modules to give each other data with the following conditions:
They are relatively short range. They need to be near each other to transmit the data, say around 5 cm.
They are ...
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Why phones battery charges faster when magnetic case is stuck onto a metal?
Ragarding my previous question Here.
My phone was at 18% battery. Placed the side of the magnetic case which the behind side of my phone is attached to, on top of a metallic lid. It took less than 7 ...
