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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3answers
138 views

Increasing life of LED glow

simulate this circuit – Schematic created using CircuitLab I have an AC wired fluorescent lamp (antique one,) and I am making it portable by removing the bulb inside it and wires. I am going ...
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2answers
55 views

Connecting battery packs in parallel and series, each with their own BMS

Recently I bought cheap a lot of CASIO DT-9723LI battery packs. Every pack consists of 2 Sony 6th-gen Li-ion 18650 cells and its own 2s BMS. Here the question arises: Can I connect this packs ...
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1answer
35 views

Include TVS in low current battery powered circuit?

I'm designing a circuit powered by two alkaline cells in series with a voltage of 2-3.2V. After being fused this is going through the boost converter MCP1640B with constant 3V3 output. The maximum ...
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1answer
29 views

Can I use a Y-harness to charge battery while in use?

I’m a beginner in creating circuits, and I need to find a way to charge a battery while the battery is powering a motor on another circuit. I’m planning on using a parallel circuit, with one end of ...
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40 views

A basic question on interpreting a battery ratings

A phone battery has the following ratings on its plate: It says 3.8V 7.22Wh. Does that mean the battery can provide 1.9A constant current to a 1 Ohm load for an hour with a little battery voltage ...
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36 views

How to distribute power from battery to different circuits?

I’m trying to link a 6S 30A battery to two different circuits, but I only have one wire attached to the battery. Is there any way possible for me to connect the battery to power both circuits at once?
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31 views

Lion 18650 battery charger drops the load if mains fail

I got a 2x18650 charger from Aliexpress (link below) and it works great. My problem is that if I remove the 5v Power supply from the wall (simulating a power cut) the load (Arduino project) switches ...
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1answer
38 views

Calculate battery discharging time?

Being far enough from everything about electrical engineering and so on, I'm sorry in advance for a dumb and possibly asked here in threads earlier such question. I have only the next data on ...
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2answers
29 views

Should I look at nominal or max battery voltage for choosing resetable fuse?

I am building a LED/Camera control circuit that is going to be using a 14.8V Li-Ion battery as a supply. I want to put a resettable fuse to prevent short circuits from blowing up too much since this ...
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1answer
68 views

Supercapacitors as batteries [duplicate]

As many videos are telling about the future when batteries would be exchanged by supercapacitors, which would charge fast and with larger power density. How much amount of these capacitors with what ...
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1answer
51 views

10S1P issue - battery not charging

I recently bought a E-board (electric skateboard) which would not charge. I opened up the battery compartment to check the voltage of the batteries. In case of an undervoltage which led to them not ...
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2answers
88 views

If I have 3 batteries 100mAh 200mAh and 300mAh what the total charge in series?

I have a tiny questions about the total charge the 3 batteries (E=1,5V) in series. I compute that way: \$ Qtotal = C_{eq}\cdot 3E\$ \$1/C_{eq} = 1/C1 + 1/C2 + 1/C3\$ \$1/C_{eq} = \frac{(C1C2+C1C3+...
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22 views

Interrupt circuit by voltage - Low Voltage DC

Non EE here, looking for some advice. I have a solar power and battery system in my RV. I am using UpCycled Tesla battery modules for my energy storage. I want to better protect the batteries and ...
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2answers
77 views

Charging a battery without overloading the rest of the circuit

I have a charger circuit (BMS) V1 which charges my LiFePo4 V2 battery, the battery also attaches to a circuit which can take a little more than 3.3v, however if for what ever reason the battery fails ...
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3answers
136 views

Batteries in series discharging unevenly

Hi I am quite new to electronics, I had a project powered by 3xAA batteries in series (~4.5 V) with an LDO dropping it to 3.3 V. It went flat quicker than expected but what was very surprising to me ...
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3answers
113 views

Reversed polarity of CR2025

My bike light uses two CR2032 batteries, which I replaced with CR2025 and some padding. It stopped giving light, so I removed the batteries and measured voltage. One battery gave 2.8 V, and another -1 ...
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2answers
57 views

tp4056 power consumption

I have replicated the li-po battery charger with the famous TP4056 , the protector DW01A and the mosfets FS8205A... exactly like the comertial board. I design a board that contains this circuit (and ...
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2answers
50 views

Sparking and electrical arcs in electrical contact

Consider a group of 5 batteries joined up to two pieces of finely engineered metal, that form common positive and negative bridging contactors for the group. If one of the batteries were to become ...
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18 views

How to set up an 18650 BMS with two B- leads?

I'm building a 7S2P 18650 li-ion battery pack. I have this 7S BMS that has two different leads labeled B-. There is a thin black wire as a part of the balance connector; this is pretty typical, ...
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40 views

Can I use a rechargable battery with a PIR sensor designed to use two CR2032 batteries?

I use a PIR sensor that works with two CR2032 3v button batteries (in parallel). The main problem I face is that the batteries are only lasting for less than one month. ...
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3answers
66 views

Using two 12V batteries in series with both a 12V and 24V output

I have a tornado shelter that I have wired for both 120V AC and 12V DC. All of the lighting is via 12V DC while the AC is used for recharging the batteries and running a 1500 VA UPS system that will ...
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2answers
112 views

How bad would it be for a NiMH battery or/compared to a Lithium-ion battery in a device to sit unused for years?

I have a Sonicare toothbrush which has Lithium-ion battery and a body hair trimmer that has a NiMH battery. I have charged the Sonicare once or twice without ever using it, just to stop it go to 0% ...
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2answers
45 views

Alkaline battery performance at -30 Celsius

I am making an IoT project and planning to power it with alkaline batteries. Their safety and low cost are really appealing. Their low discharge capability is not a problem. The batteries need to be ...
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3answers
66 views

Nickel battery balancer

TLDR: The question is about retrofitting a balancer to the Ni-MH battery of an existing appliance (that doesn't trickle charge the battery), preferably in the way that will not require frequent access ...
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1answer
57 views

How can I evaluate the condition of used lithium ion batteries?

I am coming into possession of hundreds of 18650 batteries. They are used, but initial checks indicate over 90% of them are good batteries. I would like to discharge, charge, and measure capacity of ...
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2answers
68 views

Switching between series and parallel battery connection

Previously I made same scheme (attached) but with two relays and it worked pretty well. Now I want to rebuild it with transistors (MOSFETs). The main purpose as I mentioned in the subject is to ...
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2answers
74 views

Isolated power supply with Vout = Vin

I need to create two isolated power supplies (so that one's electrical noise doesn't affect the other) out of my 12V battery. One has to be at 5V for some logic circuitry, and the other at battery ...
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2answers
45 views

Small battery for multiple small charges

What are small batteries that can put up with lots of small charges? I get that you can't have everything in a design, so I get that it will be heavy or expensive. Imagine a RC car with some photo-...
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1answer
85 views

Will my DIY powerbank be safe? It will be charged using laptop chargers

I want to build a DIY power bank that can be powered using most types of laptop chargers. I do not have any background except personal interest and lots of videos and documents read online. I need ...
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3answers
61 views

Battery charging voltage additive?

I've got a 18.5 volt battery made up of 5 3.7 volt cells (Li-Ion). For charging the datasheet for the single cells says the battery requires .5 volts more, to counteract the internal resistance, I ...
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5answers
166 views

Can commercial 9v batteries deliver 2 amps?

Are these commonly used, cheapish batteries able to deliver 2 Amps of current continiously and safely? I know that assuming 200mAh capacity the battery will be dead in 6 minutes or so. Example ...
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2answers
95 views

Using 18650 batteries to power TV during power outage [closed]

I have a ton of 18650 batteries. As a fun project, mostly to learn. I would like to build a battery pack with these batteries, and power my TV when there is an outage. Can I just match the AC 120 V ~ ...
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2answers
75 views

Current delivered by the vehicle alternator

I have a vehicle alternator with following parameters: 14V, 140A. In parallel to this alternator is connected 14.4V vehicle lead acid battery. The alternator is used as a power source for a load which ...
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1answer
53 views

Zener diode conduction

Why doesn't the zener diode conduct even while the battery is being charged at a higher voltage than 6.8v? I assume that to charge a battery the charging voltage has to be more than the batteries ...
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2answers
29 views

Effect on mAh of connecting 2 batteries in series

Two batteries, each at 1000 mAh let's say, connecting them in series will not result in a 2000mAh capacity, right?
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1answer
33 views

Help needed configuring battery bank out of smaller cells

Due to availability and not practicality, I am attempting to build an as large as possible battery bank from 16 AH AGM batteries. The end goal is a large system that is charged with a solar system ...
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3answers
603 views

How much energy is stored in a AA battery when its voltage has dropped to 1.2V?

The general question is how useful it is to use weak batteries with a boost converter - say, boosting 3AA of 1V each to 5V? According to this image it seems that only 5% of the energy is left when ...
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0answers
28 views

Help about MCP73831-2 charger management chip

I designed a circuit with a battery charger using MCP73831-2, this is the circuit i used After testing it for about 4h i ended with a swollen battery My question is what can cause this problem ? and ...
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1answer
70 views

Meaning of battery name

I'm currently working on making a battery I salvaged from a mowing robot usable. It doesn't have a datasheet or anything, since it was made specifically for the robot and wasn't intended for consumers....
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1answer
36 views

lithium 72v(2x 36v series) charging with double 36v charger For ebike project

Edit1: Voltage is wrong but here basic wiring diagram for paralel to series Changeover switch a diagram i found on internet closest to what i want i want to series 2 36v battery pack i know to ...
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1answer
37 views

Battery with alternative power supply

I have a circuit that can use a 9V battery for power, but also want to alternatively connect to a power supply (usually higher that 9V) without taking out the battery. Is it OK to just connect the ...
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1answer
42 views

Battery connector and wire ampacity

I’m considering using a JST ACH connector with my LiPo, but I don’t understand whether the current rating on the data sheet is for aggregate or for each wire individually (which is my guess since they ...
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2answers
105 views

Power a 12V 30A (instantaneous) load. Possible with 18650 cells?

(novice) Hi, I'm driving a 12V load for ~1s second very infrequently, at a draw of about 30A. The load isn't particularly voltage-sensitive. Total mAh isn't that important. I have a supply of ...
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3answers
60 views

Buck converter source current draw

I'm doing some calculations for a system that is going to use a few buck converters. I need to make sure that the battery will be able to feed enough current but I'm not 100% certain how power on the ...
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1answer
97 views

how to increase output current (5V Output, 1.5V input Switch Boost Converter) [closed]

I designed a small boost converter with discrete transistors, and now I need to increase the output current. The output is 30ma/5V but I need more than 70ma. How can I improve the circuit? R5 is load....
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3answers
53 views

Adding different voltage battery to same circuit

I have 9 volt battery to get 5 volt using step down converter. I want to enable the step down using a timer IC max input voltage 6 volt. I will use 3.7 v battery for this. So my question is: Can I ...
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1answer
34 views

Should I charge an in-series 6-pack of Li-ion batteries at 4.2v 1A or 25v 1A?

I have a 6-pack of 18650 Li-Ion cells connected in series, so it gives around 22v dc output. To charge a single Li-Ion cell I need a 4.2v 1-1.5A charger, simple stuff. But to charge the whole 6-pack, ...
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60 views

How to prevent voltage droop when discharging a battery?

This is quite an open question, so apologies in advance if you would rather schematics and the like, if you really think this would help I can provide them My problem: boosting from 2x AA Li ...
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0answers
29 views

R-Pin on 4-Pin battery?

I am currently salvaging parts from a husqvarna automower 305 to use in later projects. Among the parts is a variation of this battery: https://www.amazon.de/Green-Werkzeug-Husqvarna-Automower-...
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23 views

Present information in coulomb counter in Windows/Linux

I'm making my own mini laptop using the innards of a compute stick clone. One thing that has me confused is how I should interface the battery monitoring to Windows in order to show it in the standard ...