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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0answers
11 views

Battery pack charging port reverse diode | voltage over charging port pins

I'm planning on building a diy battery out of 18650s, which has a BMS, for a Onewheel. The voltage will be 63v and max load +10A so it will be 15s. There will be an XT90 where the load will be ...
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1answer
16 views

MOSFET N loss power battery calculation

I have a circuit to calculate my battery level using NodeMCU. I use this formula: ...
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1answer
20 views

Any li-ion battery metric or test that could correlate with its past usage?

I am trying to find any metric or test method that I could use to get information regarding a battery's past usage. Suppose a battery 'A' has been used in good conditions in the past and battery 'B' ...
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3answers
2k views

Relation between battery cell capacity & internal resistance

I'm trying to design a large battery pack, that should provide a given amount of power, with a reasonable amount of heat dissipations. To do so, I have three degrees of freedom: indidividual cell ...
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2answers
400 views

Three AA batteries in series, only 1 depleted?

I am powering an ESP8266 with 3 rechargeable AA batteries. The ESP logs the voltage, so I saw the voltage getting lower over time. Much earlier than expected, the ESP stopped working since the voltage ...
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0answers
48 views

How come usb power banks tend to be much larger than cordless tool batteries?

I have a 10000mAh battery pack for charging phones/tablet/whatever but I also have some cordless tool batteries which can be used in an inverter to power a usb charger similar to the power bank. The ...
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1answer
32 views

3.7v to 12v or 24v amp calculation

I'm trying to connect some 18250 lithium ion battery. 3.7v and has a 2700mAh capacity. I'll like to connect twenty of the batteries which I guess will be 54A at 3.7v in series to boost the valtage to ...
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1answer
134 views

How to use 18650 batteries and increase voltage from 3.7v to 12v

Im trying to do a DIY RC car with uses two 12v motors as well as some LEDS servos and Arduino components. I was planning on using two 3.7v 2600MAH 25A 18650 battery cells on parallel to have a bigger ...
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6answers
145 views

How to improve this battery-status (voltage monitor) circuit?

How could this "Battery OK" indicator be improved, without adding too much complexity (or maybe even simplifying)? The intended function is to have the LED illuminated at relatively-...
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0answers
46 views

lithium ion electron drift

someone okei my dumbass friend sent me this and asked why should its not work he said electron should drift from cathod to anod again. so,What you think about it?
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62 views

DIY electronics projects powered by Sony NPF batteries

I'm looking into making some DIY projects to be powered by the Sony NPF series of batteries. These batteries are usually found in photography and video equipment. The issue is I can't seem to find ...
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2answers
309 views

What is the minimum safe voltage for NiMH batteries, if at all?

Is there a minimum voltage below which a NiMH battery shouldn't be discharged to? One of the contributors on this website writes 800 mV is where you definitely want to stop to avoid damage. There is ...
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2answers
29 views

How do I calculate the discharge time of a battery with a step-down converter?

I'm building a battery to drive a small 12V motor which is rated to draw max 7A. The battery has the following stats: Nominal voltage: 14.4V Capacity: 20.4Ah So I calculated that the energy should ...
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1answer
36 views

Over Charging Laptop Batteries [closed]

My laptop has a 11.55V battery (HT03XL). the battery is not holding charge and the cell covers are deformed. Unit came with a 19.5V 3.33A charger. Why over charge?
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1answer
28 views

MCP73831-2ACI/MC not charging

Update: I resoldered a new IC and everything works. I have designed a charging circuit for a device that I am building. The circuit uses a MCP73831-2ACI/MC (datasheet). These are the schematics: ...
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3answers
6k views

Why are so many batteries 3.7V?

This seems like a very common voltage. I remember older batteries used more round numbers like 1.5V or 3V or 9V. 3.7V seems very arbitrary but seems to be everywhere.
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1answer
22 views

L298N Module 5V pin behavior on above 12V power supply

I have a lead acid battery that is barely above 12 volts (at 12.6) volts. This seemed enough to trip the switch in behavior that changes the 5V pin from output to input in the L298N motor driver ...
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1answer
14k views

How does a battery balance and protection circuit work?

I am building a 4S LiPo battery pack that I would like to incorporate in a portable speaker project and I need to make sure the batteries will never require maintenance beside replacing them ...
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1answer
41 views

Pulling different voltages directly from AA alkaline cells wired in series

I need to power a miniature LED light show that will draw a few hundred mA, or possibly more, and requires less than 5 Vin, and a microcontroller board that wants 7-21 Vin. I was thinking the easiest ...
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0answers
13 views

What is the right BMS and S/P configoration [closed]

the cells are 3.2 volt at 280ah buy 32 cells what is the best 12/24/28v and the best BMS for setup I have all ready purchaced cells and am waiting on delivery to install in my rv
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2answers
37 views

Does my total power supply voltage need to equal the sum of the voltages in my circuit in series?

If I have let’s say, 4 bulbs, each rated at 1.5 volts and they’re all connected in series. Would my battery need to be rated 6 volts? My logic is that each bulb would have a voltage drop of 1.5 volts ...
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1answer
210 views

Lead Acid battery switching regulator to keep constant output

I am trying to use this ups design(below image)(max 500mA) but I want to use switching regulator instead of linear regulator to keep regulated Vout as constant possible even when battery drop below ...
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2answers
73 views

Lead acid battery for embedded system

I am developing an embedded system that contains a 12 V lead-acid battery. The system is developed for 12 V vehicle applications, also using a 12 V lead-acid battery. I am not so sure how to connect ...
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1answer
41 views

How can I build a power bank which charges to 16.8V and outputs 12V?

I am working on a battery build project to drive a small 12V electric motor (7A max current draw), and so far I have gotten this far: I will use Li-ion 18650 cells in a 4S6P configuration I will wire ...
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1answer
53 views

Is there a way to recreate or buy this battery? ICR14500 3.7v

I'm trying to repair a soap dispenser: https://www.simplehuman.com/products/foam-sensor-pump I opened it up and found the battery was damaged, and I wanted to see if I could replace it. Before I ...
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0answers
35 views

Cell matching by capacity and resistance

When matching li-ion cells in a battery pack how do you use both the cell's resistance AND capacity? I've seen sources mentioning that each parallel group should have about the same capacity, and that ...
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40 views

Remote LED to warn me when a relay in my hot water supply is activated; all wirelessly [closed]

I have installed two electric water heaters in series; the new one is only being used as a preheater that only comes on automatically when my solar panels are producing more than my consumption. All ...
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0answers
31 views

What is the ASBBA-001 battery connector (GoPro Fusion 360 camera)?

I am designing a PCB that will be powered by a battery. The battery model is the one used by the GoPro Fusion 360 camera. Specifically, it is the ASBBA-001 battery. I need to know which is the model ...
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1answer
47 views

“Hidden” terminals on DC motor

I have this DC motor that I tried testing with common sense, but doesn't work. The description classified it as "Female terminals" I don't have a multimeter on me now so I can't be sure ...
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1answer
26 views

Is it suitable to wire 'protected' li-ion cells in series and parallel? 2S6P

Here is the circuit designed to give about 7V. Each cell would be a protected cell. Is it safe to connect these cells that way? Thanks
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1answer
856 views

How can I limit the current drawn by a Li-Ion battery pack BMS?

I have a Li-Ion battery pack made with twelve 18650 in a 3S4P configuration, using an off the self Battery Management System (rated for 25A), that I purchased on aliexpress. I tried to charge it using ...
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1answer
31 views

How to stabilize and add additional power to an existent line?

My first question on this Exchange so I hope this is the right place for it. Currently, I have a quite unstable power supply in my workshop, coming from a very old electrical installation. It is a ...
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48 views

Two phone batteries connected in series not working

I have two, fully charged, 3.7V standard Nokia phone batteries, that I want to connect together to use as a 7.4V battery, I connected the (+) of one to the (-) of the other, and then tested it but it ...
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50 views

can I modify lithium ion battery

I want to make a chemistry school project with lithium-ion battery for that I'm thinking that if I could open and modify a lithium-ion battery and reuse it again as my project my questions are. Can I ...
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1answer
95 views

USB and Battery switching circuit not working [and buck boost converter not working either]

I am an absolute beginner when it comes to electronics and this is my first circuit, so please excuse my ignorance and thank you for your patience and help. I am trying to build a circuit which ...
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1answer
120 views

Calculating Battery Life with different working voltages

I have device that draws 30 uA in current continuously, and it is powered by a Panasonic CR2032 device (240 mAh - continuous standard load current: 0.2 mA ). There are two components on this device, ...
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1answer
168 views

Power bank DIY Build (Regarding protection circuits)

I have been toying with the idea of making a power bank, as I have a few old laptop batteries lying around which are still working well. I plan to use these components: Constant-current lithium ...
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0answers
34 views

12V Mobile Power Setup -

I am looking for feedback and experienced insight as I'm new to this world. I have a 12V 18Ah AGM battery connected to a 300W 110V pure sine wave inverter with the intention of running a 140W speaker ...
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2answers
177 views

LifePO4 battery to replace lead-acid

I want to replace my cargo van's lead-acid battery with a LifePO4 battery. Never used any li-ion type battery for high amp burst. The current lead-acid is NAPA The Legend Premium Battery BCI No. 75 ...
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4answers
132 views

Powering a 1 watt LED using a 3 V coin cell

I was hoping to power a 1 watt LED (would be great if this is capable of powering 2 or 3 watt LEDs) with a 3 volt coin cell. Will the coin cell be able to output voltages and amperages that are ...
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1answer
72 views

How long should one let the motor turn (witout driving) to re-charge the car battery, after having using it to charge a laptop's battery [closed]

I'm going to spend 1 week with no electricity. I won't need any for everyday life (I do this each year), except to charge my laptop's battery (10.8V, 5.2Ah, 57 Wh) three or four times. I have a car ...
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1answer
48 views

On new phones, how are two batteries at half capacity able to charge faster than one at full capacity?

Lately, there seems to be a trend in cell phones where they have 2 separate batteries, and this is claimed to increase changing speed. See "Oppo suggests that because the two batteries can be ...
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1answer
241 views

Why does the X-box 360 controller battery pack have an integrated breaker contact?

People owning an X-box 360 with wireless controllers came across a phenomenon where older controllers were switching off randomly while playing or if they were moved too quickly. Me and everyone I ...
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3answers
994 views

Can I increase the no of operating hours of a battery without increasing its capacity?

Setup Let's say I have a 12V / 1Ah rechargeable battery pack. A device that consumes 0.1A will run for 10 hours. When the battery drops to 8V, the voltage will be insufficient and the device won't ...
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1answer
132 views

Why do positive terminals on DC devices exposed to water corrode more than negative terminals?

I'm a glaciologist working in Patagonia where everything is always wet. Often water makes its way into instruments, radios and other devices and I feel that always the positive terminals of batteries (...
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2answers
387 views

Would I be able to use a rechargeable battery in a Fluke 87V (based on specifications)?

Would a Fluke 87V meter be able to run on a 9V Li-ion rechargeable battery capable of 550mAh? In general (for any device), what information (device specifications) would I need in the future in order ...
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0answers
45 views

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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1answer
193 views

Battery Disconnect Switch

I'm an Electrical Engineering student still new to power systems. I'm working on a project that uses a 24V and 200Ah battery bank made up of 4 AGM lead acid batteries. The batteries are supplying four ...
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1answer
332 views

Sony NP-F battery terminal connector

I'm looking to repair some electronic equipment and am scratching my head why the part I need is so hard to identify. I recently had a bad connector on an Aputure Tri-8s LED light (Brand new out of ...
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2answers
749 views

How to use CC/CV Charger with a DC/DC converter

I am searching for a solution to charge a battery pack (7S1P)[ICR18650] with a charger with CC/CV mode and I have a BMS for protection (I've done research to maximise the security of the battery pack)....

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