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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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Sg3524 power inverter ic with IRF3710 Mosfet

i have a power UPS that have an sg3524 ic for frequency generation and 4 x IRF3710 mosfet for inverting. I am planning to incrase the output watt for this inverter by using of IRF460 since its 280W ...
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38 views

How to calculate how often the batteries to be recharged by using Excel Sheet?

Question: Battery life calculations for automatic nest window operator Bobby has a pet parrot, Jacky. Jacky wakes up at 8 am and sleeps at 8 pm. Jacky has got nice nest to stay. Bobby wants to get ...
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1answer
18 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
18 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 ...
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20 views

How do I charge a 2S 250mAh 7.4V LiPo battery?

I have a Venom brand 2S 250mAh 7.4V liPo that I would like to recharge, but have no idea what charger to buy. Here's the link to the battery so you can see what it looks like: https://www.amazon.com/...
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1answer
67 views

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

Brief summary I would like to know whether it is beneficial to add a capacitor in parallel to a CR2032 coin cell to increase its life span to protect it from occasional current spikes (15 mA) if the ...
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39 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
46 views

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

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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66 views

if I input 3.0 - 4.0 v from a lipo battery, can I get 24.0 to 25.0 v as output?

I'm working on a volunteer project for which I'm already funded based on my proposal (that is to say, I have limited funds) I'm also not so good in electronics and I've been self-taught so far. I got ...
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2answers
29 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
27 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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59 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 ...
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2answers
75 views

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

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 ...
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1answer
33 views

Does galaxy tab a reduce performance when battery is damaged [closed]

My galaxy tab a was a super fast device. it comes with 2 GB ram and qualcom chip set. After 2 years (in 2018) it turns off by itself and the performance is so low laggy. HELP.
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Practical ways to degrade capacity of internal battery in mobile phones [closed]

According to the answer on security stack exchange linked below, mobile phones contain an internal battery. This poses a potential security risk as it is unknown whether the internal battery is able ...
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23 views

charge 6v and 8v batteries in series

I'm using two golf cart batteries, a 6v and an 8v, in series to provide a reliable power supply for a ham radio transceiver, which draws up to 25 amps and only works efficiently when the supply ...
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1answer
44 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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27 views

Difference between 6v UB645 and 4AA

I'm just a hobbyist working on a prototype for a toy. I'm using one of the small 6v blowers typically found in mascot costumes (like the silly t-rex). It currently uses 4AA batteries but I was ...
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2answers
123 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 ...
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39 views

How to tell wheter the battery or its protection board is failing?

I bought a brand new wireless keyboard that is working wired, but not in wireless mode. After some testing, and the lack of support from the manufacturer, I decided to open it and remove the battery. ...
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1answer
48 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 ...
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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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3S LiPo Charger and Balancer CIRCUIT request

I am in need of a circuit that can charge and balance a 3S1P 1000mAh LiPo battery @250mA. Does anyone have one of know of where to find one? A little bit of project background: I've been messing ...
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1answer
39 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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43 views

Rectifiers and cable sizing

I have a rectifier with 12x2000 W (24 kW) modules, used with 8 strings of batteries in paralel (4 batteries per string, 180 Ah batteries capacity). I want to size the main input cable, I did the ...
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1answer
51 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. ...
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1answer
24 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 ...
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63 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 ...
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4answers
200 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 ...
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1answer
43 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
83 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 ...
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1answer
42 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
86 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-...
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1answer
44 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
40 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
29 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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Using a SVS chip with N-MOSFET to prevent over-discharge of NiMh Battery Pack

I am working on a personal project utilizing a 12-cell 14.4V NiMh battery to power a Raspberry Pi. The battery voltage is stepped down to ~5.1VDC by a buck converter. In order to prevent over-...
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1answer
44 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
31 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
34 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 ...
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3answers
351 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
20 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
113 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
67 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) ...
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1answer
111 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. ...
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23 views

Repairing damaged battery pad

Trying to fix up this PCB -- One of the batteries leaked and corroded a hole in one of the battery pads. I tried to fix it a while ago with some electrical paint, but it did nothing. I remember ...
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1answer
36 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 ...
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1answer
134 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 ...
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2answers
51 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 ...
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1answer
28 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 ...