Questions tagged [batteries]

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

Filter by
Sorted by
Tagged with
2
votes
1answer
75 views

18650 battery pack - How to remove (thick) nickel strip?

I am trying to find a good way to remove (quite thick/strong welds) nickel strip from 18650 battery packs without damaging the 18650 cells...and having a relatively flat surface (on the cell's ...
0
votes
1answer
45 views

Types of Battery Charging - Trickle Charging

I have gone through various materials online to understand the concept of trickle charging and other types of charging. I have a few queries which were not clarified. From what I understand, trickle ...
0
votes
0answers
42 views

Lithium coin cell battery showing randomness in voltage - Do batteries build up potential difference like a capacitor?

I've experienced Lithium coin cell batteries giving an initial spike in voltage discharge and then quickly dying down to very little voltage. This previous question (Lithium coin cell battery showing ...
0
votes
4answers
81 views

How can I calculate the minimum switch time between main battery and back-up battery for my board?

I have UpSquared board for an embedded system. I have a main power supply(battery) to feed it and I also have a back-up battery for some situations. For example, something happened and main battery ...
0
votes
1answer
85 views

How to use capacitor as battery in razor? [closed]

I have an old razor machine Philips 1304, it's circuit is broken, all I have is motor, housing ,blades and AC Adaptor. So the question is how to use it just via power ? I can use capacitor only and ...
2
votes
2answers
63 views

Soldering 18650; is an FX-888D good enough?

So, I want to make a 18650 battery pack but don't have access to a spot welder. I'm wondering whether a FX-888D would be good enough to do the job quickly and so minimize risk of damaging the cells. ...
0
votes
0answers
41 views

Calculating Battery Charge from Solar Panel

I am trying to create an arduino system with radio-transmitters and radio-receivers. The system runs from a rechargable battery that is charged with a solar panel. I am using a 1.1W 6V solar panel. ...
0
votes
2answers
77 views

Is it possible to charge a capacitors, and in return charge a battery?

If suppose I have a Li-ion battery of 10000mAh Input/Output: 18W Max (5.1V/2.4A ,9V/2A , 12V/1.5A) How many 1000F capacitors would I require to charge the battery?. Ok, simply put, I am trying to ...
0
votes
3answers
65 views

How do I correctly power the l298n motor driver with 6v?

Recently, I have purchased the L298N Motor Driver with a couple of 3V-6V motors. I am planning to make a robot buggy to hold other projects I may do with the Raspberry Pi. Currently, I have been ...
0
votes
1answer
39 views

Switch for battery device

I have a motion activated circuit build with a spring switch (sw‑18020p) and powered by a CR2030 coin cell. Every time i "shake" the circuit, it turns ON for some seconds to grab some sensors readings ...
0
votes
0answers
57 views

Circuit to connect/disconnect a battery from circuit input, controlled by the MCU, self-power-off

Here is my current idea, but I'm wanting something better. Because in my circuit it is missing a way to discharge the capacitor C1 whenever the battery is disconnected from the circuit input. I have ...
1
vote
0answers
45 views

Battery management for 12-24V motors

We have 4 12-24V motors which we want to connect to a 14,8V battery. Two of the motors are position controlled (M3 and M4, see figure) and will not draw much current as they will mainly be stationary. ...
0
votes
1answer
100 views

Can I keep Li-Ion battery 'charging' continuously at 3.7 V?

I have built a Raspberry Pi NAS and it is powered by a lithium-ion battery through a 5 V step-up module - the one used in powerbanks. The battery is a 18650 Li-Ion battery which is kept continuously ...
1
vote
1answer
39 views

Battery Management Controller

I designed a wearable with a 3.7V Li-Po battery (381018). Everything worked good at the begining and now after 6 months I realize some circuits are not charging anymore. For what I understood when I ...
0
votes
2answers
49 views

Help understanding secondary cells discharge curve

This is what I've understood about the process of discharging of a secondary cell. If I have a rechargeable cell, full charged, and I make it discharge at a certain constant current, let's say 1A, I ...
0
votes
1answer
48 views

Non inverting DC-DC converter that makes fix 4V from a decreasing voltage from 4,2V to 2,8V? [closed]

Is it possible to make a a non inverting DC-DC converter that makes a fix 4V from a Li-ion battery's voltage. I need about 1,5A. The input voltage starts from 4,2V and decreasing to 2,8V as the ...
0
votes
0answers
51 views

How does battery protection ICs sense current

I have a hard time grasping a concept when it comes to a particular type of battery protection ICs (which protects from overcharge/under-discharge and over-current). One example is the BQ2973 from TI, ...
0
votes
1answer
28 views

Connecting breadboards with different batteries to a single switch

I have three different breadboards with ten LEDs & resistors connected in parallel. All three are powered by a 9v battery. I was wondering if there would be a way to wire all three batteries to a ...
0
votes
1answer
70 views

How to build a small LED assembly?

I'm building a custom model of the AT-ST from The Mandalorian: I have the model almost done and I thought it would be really cool to add actual lighting to it. The model is about 6" (16cm) tall, but ...
0
votes
1answer
40 views

Do DeWalt charging safety features reside in a dewalt charger or a dewalt battery? [closed]

This is a cordless battery of the the type I mean, a DeWalt flexvolt: https://images.app.goo.gl/zKHBsvBnT4ViMJL56 This is the kind of charger I'm talking about: https://images.app.goo.gl/...
0
votes
1answer
19 views

Can we use DC-DC Buck convert installed 3.8v battery to power Phone continuously?

I have a Windows tablet whose battery is dead and I want to convert it to without battery to use as a digital photo frame. Table dead battery is 3.8V Can I use DC-DC Buck convert (DC-DC converter ...
0
votes
1answer
46 views

Choosing a resistor for balancing lead acid batteries

I have a solar-panel-and-battery kit with a built-in inverter and what not built into the battery box. (Goal Zero Yeti 400) The battery box has Anderson Powerpole connectors for chaining it to ...
1
vote
3answers
63 views

How to drop 5v regular phone charger voltage to 3.7v to run a device, which use 3.7v output battery before

I have Motorola Moto 360 2st edition smartwatch and watch original battery is dead. I have converted smartwatch into table watch in DIY wooden block and added 18650 3.7v battery instead and now its ...
1
vote
4answers
76 views

How much of the loss of battery capacity in higher currents is caused by its internal heating?

For example this page give this data for one AA battery: 0.5A : 1.84Ah 1A : 1.411Ah 2A : 1.18Ah Is it mainly b/c of the internal heating?
0
votes
1answer
76 views

Powering 9VDC from battery

I've got a Roland TD-11 drum module that I want to power from a battery. I only need to power it for 2 hours at a time. Can I please have some recommendations how to achieve this? SPECS: Output ...
0
votes
3answers
96 views

Benefits of square vs. triangular/hexagonal packing of cylindrical battery cells

A triangular or hexagonal packing (depending on your preference of terminology) of circles has a packing density of \$ \pi\sqrt3/6\$ \$ \approx\$ 91% (see here at Wolfram Mathworld, for example), ...
0
votes
1answer
62 views

How long will my x 2 23a 12v battery last running a 300mah camera?

I’ve brought some WiFi cameras to run in bird boxes but the battery life on them aren’t very good at all. I’ve tried running them from battery power banks but they switch off after the cameras have ...
1
vote
0answers
44 views

2S 18650 Li-ion battery pack conundrum

I recently bought a remote control toy for my son which included 2 2S battery packs, with a single SM-3P plug, and a corresponding USB charger as shown here. Initially, the car worked fine, though ...
1
vote
1answer
46 views

What is the distance I can put between a 20watt solar panel and a controller and still have enough current to make it work

I purchased a 20 watt solar panel to be mounted to the hardtop of my boat to charge my batteries. The directions say put the controller within five feet of the batteries and the solar panel can be up ...
0
votes
0answers
17 views

Jeita compliance for discharge?

I know there is a Jeita compliance charging scheme for charging batteries. But is there such certification for discharging them in the function of temperature? The following is an image of the Jeita ...
0
votes
1answer
71 views

Help me with a 4S1P for vacuum cleaner please [closed]

I'm new here, and this is my first time trying to fix my Ilife V7S pro vacuum cleaner battery. The original battery is this: I want to replace the 4 18650 with my INR18650-25R daweikala I have seen ...
0
votes
2answers
74 views

Connecting a light to a battery

my son and I are working through this book called The Thomas Edison Book of Easy and Incredible Experiments. We are stuck on the first experiment where you make a switch to connect a battery to a ...
0
votes
1answer
75 views

Why is there a lead (Pb) warning on extra heavy duty batteries? [closed]

I have some batteries labelled as Extra Heavy Duty with a picture of a trashcan and the letters Pb for lead, and an x over the trashcan which I believe means not to discard in the trash. The batteries ...
0
votes
3answers
78 views

Thoughts on storing electricity in water vapor [closed]

for an engineering class I had to create an electrical energy storage device and I began thinking about thunderstorms (I think it was a cloudy day) and how they create lighting. I know it's not ...
0
votes
0answers
48 views

Charge a car battery from 14V 20A Max - how to limit current?

Could anyone point me in the direction how I would make a circuit to charge a large car battery from an alternator (say 12.5 to 14.5v) depending upon state of charge of the main battery, but it needs ...
0
votes
0answers
53 views

Limit current when charging a battery?

So I am trying to charge a 12V 1.3Ah lead-acid battery(actually they are two 6V batteries in series). Now I have a power supply which says 12V 500mA but actually outputs more like 21V.. No idea why.. ...
0
votes
1answer
73 views

Raspberry Pi UPS circuit review request + improvements

Based on this question I created the following circuit: Since I made some (component) changes, first I would like to have a validation of the circuit for long-term usage (and some improvements). ...
0
votes
1answer
72 views

How to discharge batteries using bench PSU?

I've heard that if you can have negative current in PSU, you can use that to discharge batteries. Is this true? If yes, how to design/modify a linear bench PSU (which have transformer with several ...
1
vote
2answers
70 views

How are series connected batteries of different voltages (or even same voltages) charged “equally”?

I am trying to understand conceptually, how a series bank of batteries is charged "uniformly". Let's take the example of of six 6V AGM batteries for a 36V golf cart. The charger is 36V nominal but ...
1
vote
0answers
31 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 ...
0
votes
1answer
55 views

How long will a 32v 15A (500Wh) e-bike battery last outputting at 5V 1A?

I hope it's okay to ask this here My e-bike has a Lithium Ion battery (32 Volts, 15 Amps), and it has a USB-A output, marked as 5V and 1A, I have 3 questions: How long will this battery last while ...
0
votes
1answer
61 views

Li Ion computer battery puncture

[![enter image description here][1]][1]I accidentally punctured just the very first (pouch?) layer on my MacBook lithium ion battery. A smell came out of it but the battery still works fine and holds ...
0
votes
0answers
18 views

ntc half stack V (oltage?)

could somebody assist pls? im experimenting with battery pack for my cordless chainsaw blackanddecker 36v gkc3630l20 h1 36v. i created 36v battery pack from lifepo4 batteries instead of liion. it ...
0
votes
1answer
32 views

18650 battery pack. Current distribution

I'm creating a 20s6p li-ion pack from 18650 cells. Here is the design I am are using 8 by 0.2mm nickel strips rated for 6.5A. With 6 parallel branches that's 6*6.5 = around 40Amps. But since we ...
1
vote
1answer
31 views

How to keep a stable output voltage from changing input voltage

I'm learning about solar panels and bought a 6V panel and a 3.7V Li-Ion battery as well as a solar battery charger, all from adafruit. I also got a boost converter thinking that the output of the ...
1
vote
1answer
41 views

9V 1A adapter and 2*3.7V battery IRF9630 produce sound and gets very hot 9V battery not (metal detector)?

I am not an expert at electronics.I am trying to build a pulse induction metal detector. I have this circuit from that Book I am using it with stm 32 blue pill but I have to stabilize the 9v supply ...
0
votes
1answer
44 views

How can I roughly estimate the load in this case?

A DC device operates with three industrial AA batteries meaning 1.5V times three = 4.5V. Besides that I only know that the approximate operating time is is 4 hours. Is that possible to estimate the ...
0
votes
0answers
28 views

Is it safe to have two batteries in series on a solar panel system with 14.22v and 14.46v?

I have two batteries in series plugged to a solar panel system. In parallel they used to balance each other perfectly. But now i'm trying to have a 24v system and I have them in series. They ...
0
votes
1answer
66 views

Charging a Li-ion battery with a Buck Convertor & ATmega8 [closed]

I'm trying to charge a 7.4 V Li-Ion battery following the CC/CV protocol and have a few questions. I want to use an SMPS from my old laptop that can provide 20 V/3.25 A and feed that to a buck ...
0
votes
1answer
79 views

Ambiguous labels for AA battery insertion

I have a consumer device that accepts two AA batteries. The battery chamber is designed such that the batteries are inserted from open end of the chamber rather than the side (i.e. along the axis of ...

1
2
3 4 5
83