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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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2answers
77 views

Pulling too much power from a 9V battery?

I found something that makes 9V go to 15V 3A and before I make the project is it bad to do that and will it kill my 9V batteries?
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3answers
49 views

Effects of joining the middle points of N parallel (2-battery serial sets)

Assume I need about 3V but large current: First, I will need 2-battery serial set for the 3V. Then, to meet large current need, I will need to parallel joint multiple those 2-battery serial sets. ...
9
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2answers
2k views

Is this a case of ground loop?

I'm trying to power a 24V DC motor using 2x 12V batteries, an Arduino and a Cytron MD10C Motor Driver. I followed the description on Cytron's website for how to connect the Arduino and the motor to ...
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1answer
67 views

Power supply question in regards to powering 400 LEDs

I have WS2812B LED strips, that has 144 LEDs per meter. The ratings are: 43W/M .3W/LED .06A per LED Input Voltage of 5V DC The recommended power supply stated by the website is 5V DC and 10A for 1 ...
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1answer
45 views

How to fix 4AA battery pack holder

I have a battery pack holder. I have tested the batteries with my multi meter. It appears that the ground and power wires on my pack holder are not working. Does this mean that the wires are not ...
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1answer
28 views

Measure unknown load resistance on battery terminal

I need a method to measure the load resistance attached to the terminals on a battery. I want to determine this load before I turn mosfet on to let battery pack discharge. Most important I want to ...
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1answer
23 views

TP4056 to charge xS1P li-po li-ion

Very related to this question. While it's already clear that several TP4056 can't be used to charge and discharge several cells, it's not clear to me if it's possible to only charge a battery pack ...
18
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2answers
2k views

Help identify the discrete component in this battery pack

I am rebuilding a NiMH battery pack for a RF remote control device which can be recharged by plugging the device in. The battery pack is connected with three wires: black to the negative red to the ...
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2answers
52 views

How to automatically assemble lithium polymer battery?

I'm redesigning a product for automatic assembly (DFA / DFX). The current product includes a lithium polymer battery with solderable leads, very similar to this: Right now the leads are hand-...
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3answers
62 views

Single Cell Battery Protection ICs

I'm designing a product that will be powered by a single 18650 cell. Specifically, I am basing my numbers off this cell in particular: Samsung INR18650-25R It has a typical full voltage of 4.2V ...
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1answer
37 views

Can I charge each Lithium ion battery, that are connected in series, with individual charger?

I don't know if I can do this and just want to make sure that it can work before I actually test it so that I don't have to worry about blowing my room up... The batteries have the same capacity so ...
4
votes
1answer
144 views

Protecting a coin cell from high current spikes - using a capacitor or not?

I've built some prototypes and try to gather some data from them. Skip below the two horizontal lines to read more about it. Original Question Brief summary I would like to know whether it is ...
3
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1answer
73 views

Integrated 5V uninterruptible power supply (UPS) with a lithium cell?

I'm trying to figure out the best way to implement a UPS for an embedded system that runs from a 5V supply. Essentially the system has a 48v to 5v, 1.2A output DCDC converter that powers my system. ...
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2answers
62 views

Does minimizing full-charge time for Li-ion batteries increase their longevity? [closed]

If the stock charger for my smartphone causes the Li-ion battery to be charged in a couple of hours and I charge my phone for 8 hours a day (while I sleep) resulting in about 6 hours of full-charge ...
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2answers
53 views

Li-ion CR2 / 15270 voltage and charging circuitry

CR2 / 15270 Li-ion batteries normally come as 3.0v. I thought Li-ion and Lipo batteries were always 3.7v, how is that possible? Does it require a different charger circuit than normal 3.7v li-ion/...
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1answer
29 views

Li-ion Modded Powerbank Question

So I got this single Li-ion power bank. It's a 18650, and I wanted to add another 18650 in parallel. I want to use the same circuit which produces a constant 5v. Is it safe to do it that way? in ...
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1answer
83 views

Battery advice re cooking equipment

Please go gentle as I am a novice at electronics/battery issues. I am hoping someone with a much bigger brain than me can answer this question... Is it realistically possible to power a 1200W ...
1
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2answers
78 views

What battery should I use in a remote control for a score marker? [closed]

I need help in choosing the right battery for my project. I built a ping pong score marker for my school two years ago. It is separated in two parts: The score marker. It has the displays, an ...
1
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1answer
54 views

How to connect a CR2012 coin cell battery with a PCB?

Im trying to build a flat, battery powered PCB assembly that fits into a small gap of approx. 2mm. I have found the CR2012 coin cell with a thickness of 1.2mm, which would be a good fit in terms of ...
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2answers
138 views

Silly question: using only the positive terminal on a battery

Right, so this is probably a pretty noob question, but I'm really interested so anyway... Suppose I disconnected the negative terminal on my cars lead-acid battery. Instead I grounded the frame of ...
3
votes
1answer
59 views

Choosing the right transformer to replace batteries?

I have an idea for a hack I'd like to build, but I need some help figuring out the right transformer. Let me know if there's a better place to post this sort of request. I have some exterior LED path ...
0
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1answer
37 views

Is it bad practice to place a LiPoly battery underneath a PCB in an electronic device?

I'm designing an electronic device and have considered placing the plcb on top of the battery within the device to minimize space used. My gut tells me this is unwise however. What concerns are there ...
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1answer
40 views

Need some assistance with making a battery box

I recently bought a 12v deep cycle battery 75 AH and I made a battery box following these tutorials: https://www.youtube.com/watch?v=cAErwLnsSIY and https://www.youtube.com/watch?v=torSEtjPZ2I (no ...
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1answer
55 views

Which microcontroller is best for low power energy harvesting application s? [closed]

I am going to use a mini wind turbine driven by train induced wind that will generate power. Now I have to store this energy in rechargable batteries with the help of boosters and buck converters. ...
0
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1answer
178 views

Charging 2s lipo with 3 wires

I have a 2s lipo baterry pack I would like to charge with a multi-purpose battery charger I use quite often for bigger balanced pack. That one (see picture) does not have a balance wiring harness and ...
3
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0answers
92 views

Parallel connection of old and new gel batteries

I have a battery system shown in the picture, 6 parallel branches of 4 batteries connected in series. The first 3 consist of old batteries which are 2 years old, the fourth branch consists of 1.5 ...
3
votes
4answers
239 views

Do voltage dividers waste battery?

I am attempting to make a battery powered alarm clock with an Arduino, and I would appreciate some help on the circuitry part. I am very inexperienced with electrical engineering. I am using a ...
1
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1answer
76 views

Is it safe to charge single 18650 cells without temperature sensing?

I was looking at 'power bank' circuit boards on Aliexpress, the kind that you add to a 18650 cell to make a basic 5V in/out supply. I noticed they all seemed to be lacking any kind of temperature ...
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2answers
99 views

What if the current draw is greater than the rated discharge of a battery?

I have a 48 volt, 20 kW motor that I need to supply with power. I am looking at a configuration of 16 LiFePo4 cells each in series, each 200 Ah rated at 1 C. At that rated capacity, it would seem ...
0
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1answer
66 views

High Power Battery System: Variable Input DC Voltage to Fixed AC Output Voltage

We are a team of students trying to build a battery system which would recreate wall socket conditions with up to 2kW output. Some of the main challenges are basically to have the battery's variable ...
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2answers
115 views

Li-ion battery powered circuit design

I designed a PCB, but I'm unsure whether this topology correct or best one. The circuit powered with Li-ion battery and the battery should charge over USB. When USB has not been connected, Step up-...
4
votes
2answers
80 views

What is the best way to mount a LiPo battery in a project box?

If you were going to use a LiPo battery such as this one: . . . and needed to mount it safely and securely inside a project box similar to what is pictured below what best way to achieve that?
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1answer
43 views

DC Battery Stability

I have a 12 V load that works by connecting an adapter from the AC socket and this adapter output 12v to the load. I decided to make a 12 v battery that can charged and the feed this load , all the ...
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1answer
31 views

What is the idle current draw of a charge indicator?

What is the most energy efficient charge indicator for a 12v battery? how many mW does it use for every state of charge?
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1answer
50 views

How short circuit is made when connecting negative cable first when jumping start the vehicle

When Jumping start, I understand that I need to connect the positive terminal first due to the safety reason. And also if I connect negative terminal first and touching the body of the vehicle with ...
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2answers
37 views

Battery powered circuit protection

I’m just curious what kind of protection you would typically expect to see on a battery powered circuit. Circuit in question is a simple 24v dc relay controlled motor. Main power source would be 2x ...
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1answer
39 views

Ultra-long shelf life battery [closed]

For those who like their questions to be 100% practical and serious, please look away now. I've just watched "Raiders of the Lost Ark", which got me speculating about how to bring the booby-trapped ...
2
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3answers
364 views

Reduce battery voltage.

I have grip warmers on a bike. basically just heat tape. I would like to reduce the supply voltage from lithium battery from 18 vdc to 12 vdc. My goal is to reduce warmer element temperature and ...
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2answers
23 views

Using an LIS3DH at LiPo Voltages

The LIS3DH 3-axis accelerometer specifies that it's supply voltage should be between 1.71 V and 3.6 V. For most applications, this just means you are using either 1.8 V or 3.3 V as your main rail. ...
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2answers
138 views

How many watt-hours in two AA cells?

If I wire 2 AA cells with a nominal capacity of 2 Ah and a nominal voltage of 1.5V each in series, then I'll get 3V with 2 Ah, right? Is that, thus 6 Wh? If I wire them in parallel, I get 1.5V with ...
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3answers
83 views

Understanding power dissipation by LDO regulator as it relates to battery life

We are looking at using an AP2204K-3.3TRG1 to convert 6V from 4 AA batteries to 3.3V to power a microcontroller. I found that the efficiency of a linear regulator is (ignoring quiescent current) ...
2
votes
1answer
117 views

Two 9 V batteries in parallel

I don't know where else to ask this question and I think this is the best place so I'll ask here. I'm making a remote controlled boat that uses two DC motor controlled by a L293D motor driver chip. ...
0
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1answer
43 views

MOSFET-switching between two power supplys: how to avoid transverse current?

For a hobby project I would like to switch between two power supplys. The two power supplys are two 6s LiPo batteries. If one battery is empty i want to immediatelly switch to the other battery. (the ...
1
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1answer
171 views

Can I replace rechargable batteries with (super)capacitors?

I need a very small UPS just to give an embedded device time to shut down when power is lost. There are a variety of solutions that use LiPo batteries to provide extended runtime; they typically take ...
0
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2answers
55 views

Increasing Amp Output of a battery

So I have battery cells with a rated capacity of 3.5Ah and a nominal voltage of 3.5v Now, say I have a system that requires 12A for a period of 10 seconds. For this battery it is advised not to ...
0
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1answer
31 views

How can I use an IC family or adapter to switch automatically from solar cell to batteries & reverse?

simulate this circuit – Schematic created using CircuitLab How can I use an IC family or adapter to switch automatically from solar cell to batteries & reverse ? if no load => solar cells ...
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1answer
48 views

Mobile power bank to power electronic system

I am working on a project where I am trying to use a mobile battery power bank as a supply to my system. The battery power bank can provide 5 V @ 2.4 A. The output of this power bank goes ...
0
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1answer
64 views

2 x 2 n-channel mosfets in series: does my circuit has any flaws?

For a hobby project I would like to switch between two power supplys. The load are two motors which can also be switched on and off separatly. The two motors are BLDC controllers in reality. I am only ...
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1answer
47 views

Use cell phone batteries as a battery pack

In my circuit, I used a simple charger circuit that works fine with standard battery packs that come with an overcharge/discharge protection circuit like this (green PCB inside.) But I have some ...
3
votes
2answers
136 views

Powering two 3-LED lamps with battery/Battery pack - Multiple questions

I have seen many questions along these lines but I don't think any is an exact match (if that's incorrect, please just point me to the right match, that would be great and save everyone some time). ...