Questions tagged [batteries]

An electric battery is a device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy

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46 views

Lithium ion Battery

What is the difference between lithium ion battery internal resistance and internal impedance? Are both same, if not which is greater ? How these values will be measured and how they help to analyze ...
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37 views

14.8V LiPo Battery Protection

Disclaimer: This is my very first time I have to work with batteries so I have basically no idea whatsoever. I need to protect a 14.8V LiPo Battery from overcharging/overdischarging. I have looked up ...
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58 views

Where to fuse high voltage batteries connected in series?

I have modules of cells in series each with 48V. I wonder where is the right place to fuse the modules in series. (The current to trip the fuse is the same on every point). Version 1: simulate ...
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46 views

HowTo create an accurate constant-current dummy load using immersion heaters controlled by Arduino?

Given: variable sized nominal 3.2V LI/LFP battery cells, from little 18650 / 26650 cylindrical A123s up to large prismatics from CALB / Winston etc. the desire to capacity-test them off grid (no ...
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273 views

Current calculations

Emergency lighting solution Continuing from the previous post above. Firstly I know how to calculate current in a DC situation. However, since I am using an inverter that produces 220V at its output ...
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2answers
83 views

What plug type is this?

I recently bought some LiPo battery packs from Ali, Now im trying to figure out what type of plug it has! Anyone knows the answer? Would be awesome.
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27 views

Low power LiPo cell ADC with an nMOS switch and a resistor or capacitor divider circuit?

This is my first question on this platform and am looking for advice on doing a very low power LiPo battery measurement for a wearable device. My current circuit looks like this: (See image below) ...
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2answers
35 views

PWM disables charging battery after heavy load on inverter

I have 2 batteries 12V 80Ah deep cycle lead in series for a 24V system. I connected an invertor directly to the battery pack. I have ~600W (~44V) of solar panels connected to the PWM charge ...
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105 views

How to active limit the current from a DC source

I have a source with variable power output during the time because it is shared with another devices and this source has not enough power to feed my load (a battery charger for a 1 cell 4.2V lipo) so ...
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2answers
71 views

Charging current/voltage for lipo batteries

I have a 500mah 1S lipo battery. I wanted to charge it with my lab bench power supply. Easy, I thought: I want to charge at 2C (which is 1A) so I simply set my power supply to 4.20V and 1A limit and ...
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How long can i run this appliance? [closed]

How long could I run a 115 Vac window unit on a 12v 200Ah battery (using a 700W inverter from a 400W solar panel and assuming 100% efficiency)? Thanks!
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diesel generator load calculation? [closed]

I notice in my father’s farm , there is a diesel generator that powers 30 hp water pump as well as water pressure control or ( water pusher something like this) that is also 20 hp. This is the ...
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4answers
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Is keeping batteries rolling loose inside a drawer a fire hazard?

Simple question. At some point I began keeping batteries (AA, AAA, 9V, etc) inside a random drawer in my wardrobe that I use for other electronics (like cables, pen drives, etc.). And I've started ...
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1answer
124 views

Using a power bank to run nebulizer

I have a portable nebulizer that can be powered by either an external power supply with a round plug or two x AA batteries. On my last nebulizer AA only lasted 12-15 minutes and AA rechargeable about ...
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58 views

How dangerous is soldering lithium ion phone battery, and how easy is messing up

I plan on leading a workshop on how to create led devices(shoes, clothing, etc), and mostly plan on teaching how to do it with old electronics, like phone batteries. The point is trying to do it as ...
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Can a 12V AGM battery be damaged by too light a load and relying exclusively on a 10.5V low voltage cutoff?

A problem I have with 12V power inverters is that they are set to give a warning beep and/or shutoff at about 10.5V (1.75V per AGM cell). This is supposed to protect the battery from overdischarging, ...
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62 views

What voltage are AGM battery capacity ratings supposed to be computed at?

I have an AGM battery that is rated at 12V 225Ah. Using the 50% "rule", the battery should be able to deliver 12 * 225 * 0.5 = 1350 watt hours = 1.35 KWh. However, when the battery is under load, the ...
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31 views

Packaging PCB and battery inside enclosure - foam

What's the name/type of the dense foam that's generally used in consumer electronics to stop components from vibrating around and tightly packaging everything together? In my case, this would be for ...
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60 views

Battery Vs. Capacitor as Power Source For An Electromagnet

I have been playing with small electromagnets recently and I'm trying to understand the difference between using a battery vs. a capacitor to power an electromagnet. I have a small electromagnet (200 ...
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23 views

Asymmetrical load distribution on Li-Ion cells within a battery pack

I am designing a battery pack with 18650 Li-Ion cells. Each cell is installed on a seperate PCB and the PCBs are connected over wires to form a 2s4p configuration. I am aware that this is not an ideal ...
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1answer
58 views

How to use a (cheap) BMS for discharge only

I'm building a small robot (for the context, with a pi zero, a PCA9685 motor controller, 8 small servo motors a regulator and an Ubec) fully powered from a 2S 18650 battery. I've inserted a (cheap) ...
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Can AGM batteries sulfate if charged too slowly?

I have 8 large healthy AGM batteries, each 6V nominal and each about 230Ah. They are matched well as far as actual capacity (I have tested this recently). I was told that if after draining down to no ...
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1answer
58 views

Charge pump vs. boost converter for high current LED driver

I am designing a high current LED driver circuit to power a matrix of pulsed IR LEDs. The LEDs will operate at 5A; 4.6V; 0.1ms pulses (~10 pulses at this frequency, wait 300s, repeat.) The device is ...
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3answers
66 views

Why doesn't a short-circuit immediate consume all voltage?

If we assume a short circuit, with zero resistance (not even within the battery), would this 'infinite current' deplete all voltage within the battery? For example, if I "short" a 9V alkaline battery, ...
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3answers
47 views

How to protect a battery terminal after removing corrosion?

I have repaired a corroded battery terminal by neutralizing it in vinegar and then cleaning it with a wire brush. The result is a terminal lead which now has bare steel visible where the protective ...
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0answers
82 views

Identification of round, keyed, two-pin high power connector

I just got a new electric bike and I'm thinking about adding an extra 36V 20Ah battery to get more range. What I'm thinking is to pull out the main battery when it runs out and connect the second ...
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Utilising patchy DC to charge a battery (from generator)

I am currently studying first year engineering at my college and would like some help with energy storage. Note that this is an industry project and not homework, so I am not breaking any rules. My ...
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70 views

Calculating battery percentage after voltage drops

I would like to display a battery percentage based on the remaining charge in the battery. I do not know if there is a better way of doing it other than measuring the voltage across the batteries. ...
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1answer
29 views

Current going into the positive pole of a battery while discharging a capacitor

Please bear with me if this is a fundamental question. Let's suppose we have an RC circuit, charging a capacitor up to the voltage of a battery of 9V. The capacitor is currently at 9V, we switch the ...
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1answer
73 views

Car battery voltage readings different with no load - normal?

Typical car battery, 12V. While connected to the car, It read 12.38V on my multimeter. Using the absolutely same multimeter, I measured it once I disconnected it from the car - voltage went to 12.56V. ...
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1answer
67 views

Why is actual SOC of a battery actually higher than what is displayed

So I read a document today which said that a higher SOC level (around 20%) is displayed as 0% to the user in vehicles, thus reducing the total capacity of the battery. My question is that why is that ...
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1answer
78 views

Battery for Specialized Device

The battery on a specialized device has gone bad. The company wishes to charge me an exorbitant amount of money to replace it. I do know that it is a 12 volt battery, however I don't know the amperage ...
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1answer
50 views

Charging a big battery with small solar panels very very slowly

I have a 6V, .7amp solar panel that typically puts out 2-5V under normal conditions. I would like to charge a 12V 5 amp hr lead acid battery over a few days to weeks. The device that I want to ...
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1answer
59 views

Does current split when we connect battery in OR configuration

Please check the below circuit. Edited the circuit as told. I have connected two batteries (Max 3A) in OR configuration to the load as shown below. Once, the power is ON, does the current (assuming ...
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42 views

How to make a phone think it has a battery on it and run it from a charger

Im trying to run a samsung galaxy s7 edge without a battery on it but it just turn on shows a logo and then turns off again i think it knows that there is not a battery inside so if anyone knows what ...
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56 views

Potential difference between battery negative and battery cover

I built a 30P12S battery pack using 18650 cells (3.7V Nominal). To house the pack I made a frame out of square tube Mild Steel. When I install the pack in the frame I get a positive reading on the ...
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1answer
66 views

Need help in understanding the working of battery level indicator

I have got hold of a battery level indicator on net. I works but I am not able to understand how it is functioning. I am new to electronics and I just dont want to build a circuit from a diagram. I ...
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1answer
317 views

Upgrading Xiaomi HIMO C20 battery

Does any one know what is the charger port is for Himo C20 Ebike battery? I ordered mine it's on its way now I couldn't find the information online. Also I was wondering if I can add this battery to ...
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90 views

How to connect a 12V battery to a 24V system?

I have a 24V battery (two 12V lead/acid in series) connected to solar panels and I'm looking for a way to have a 12V battery and circuit. (But the solar array will charge the 24V system so i need the ...
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1answer
42 views

Issues encountered when adding DC adapter to light powered by battery

I have an LED light bar powered by 6 AA batteries connected in series. There is also an RF control unit to turn the light on/off. The light eats through the batteries rather quickly thus I decided to ...
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1answer
52 views

Power output neccesary to power multiple USB devices at once?

If I have a device that requires 5V and 2A to function, what kind of power supply would I need to power 4 of these devices at the same time to their full capacity? Here is an example setup: Power ...
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1answer
86 views

Steal 5v from USB Module in 3v Mode

My project includes an ESP8266 (runs at 3.3v) and a USB C-Serial breakout. The USB module can optionally run at either 5v or 3v, and there's are solderable jumper pads to make that switch. Here's ...
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2answers
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laptop batteries charging myths - Long life OR short life

I'm very conscious about the life of battery. Some people say that don't keep plugged-in laptop all over the time and remove battery charging at 70% and again charge at 40% so your battery cells ...
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71 views

Using Solar Charge Controller with AC Power instead of Panels

I'm working on a project here which needs to have a small SLA backup battery. I have a cheap PWM solar charge controller already and I want to use plugged into an AC power supply (48V DC out) in ...
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1answer
43 views

Fairy lights dimming over time

I have had this cheap set of fairy lights for a few years. Powered by 3xAA batteries. Recently when they are turned on they start bright as they always were then proceed to get dimmer and dimmer ...
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93 views

Lithium battery charger and balancer circuit (or IC)

I am working on a project which sould charge and balance 4 to 6 (maybe 8 in future) serial connected lithium cell batteries (~4000 mAh capacity) with about 4A of charge current. First I looked for IC ...
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72 views

Which 18650 battery connection layout is best?

I am building a 5S6P battery with 18650 cells. I have limited space so the geometrical layout is constrained. I can think of 2 "optimal" ways to layout the cells connections but I don't know which is ...
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32 views

Charging a LiPo Battery with 1.5V Battery

I have a lithium-polymer battery with a voltage of 11.4V. If I want to charge it with a 1.5V power source (AA battery) and I boost the voltage to 11.7V will it slowly charge the LiPo.
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1answer
77 views

IATA battery rules

Following IATA guidelines two threshold limits are indicated: 20Wh for cells and 100Wh for multi-cell batteries. Question: Should I apply 20Wh limit also for cells in multi-cell batteries? Example: ...
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2answers
55 views

Combining 12v Marine batteries of unequal capacities

I would like to increase my RV marine deep cycle battery capacity. I currently have a Group 24 battery with 64 amp hours. I would like to add a second battery to increase my capacity to the max. As ...

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