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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1answer
87 views

Reverse Current leak Battery+Diode in parallel

on my design, I am using two coin batteries in parallel and each battery has a Schottky diode in series to block the reverse current, in theory, it will avoid the higher potential battery "charge" the ...
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1answer
27 views

Battery life impact with fast charging

Typically fast charging reduces backup time and life. Now a days almost all handsets are coming up with different fast charging capabilities. I'm currently using Galaxy Note9 which has fast charging ...
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1answer
40 views

USB and LiPo power supply with charger

I'm having trouble designing a power supply circuit for a small microcontroller-based project. The board I'm building will be powered by a 3.7V LiPo battery most of the time, but it could also be ...
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1answer
73 views

What type of connector is this for a 24V battery and charger and where can I get them?

I need to identify this connector so I could order it. I also need to find a place where I can buy them.
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1answer
104 views

Switch module test circuit design

I am doing a project to make a test box that would test the switch module in the photo below. Please see circuit diagram below for inside of the switch. Please note this switch is not an ordinary ...
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1answer
705 views

Proper way to recover 18650 cells from laptop batteries

I'm looking for a tutorial on how to recover 18650 cells from laptop battery packs. Like what should I do, and what should I not do, how to test them to see their condition. The way I'm doing it now ...
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2answers
56 views

Is there a reason why lower voltage batteries are preferred for high AH?

I was looking at these batteries and considering whether to use a 12V battery or multiple 2V batteries for backup power. In any case, I came across this battery by Exide Tech - GNB Flooded Classic H1T ...
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2answers
151 views

6 volt drop to 1.2 volts

I am working on a circuit for my deer feeder. I now have a 6 volt power source running the spinner on the feeder and it has a 6 volts solar panel recharging the battery. I made a new circuit control ...
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3answers
95 views

So why do battery chargers need two prongs? Why not just one?

Electricity flows from area of highest electric potential to lowest, I get that. What I don't get is why any battery charger would use two prongs on an outlet (or a few other items of similar purpose)....
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1answer
81 views

Difference between more batteries and boosting voltage

For example if i need 18V for a project, what is the difference if i use 2 9V batteries and 1 9V battery boosting it to 18V? Thanks in advance.
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5answers
67k views

How to get high current from 9 volt batteries

I am planning to make a solenoid.. Which should be so powerful as to lift up about 600N force. I have thought about it, and I have a doubt. How can I get DC currents up to 20-30 A using a 9 V battery? ...
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0answers
39 views

How to safely replace NiCD/NiMH with Li-ion in a small electric screwdriver? [duplicate]

I'd like to repair and re-use a small Bosch electric screwdriver. It currently has a battery of 3 small AA-type rechargables (unmarked cardboard wrapping) that has almost the same occupancy volume of ...
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7answers
756 views

Why does current not increase when batteries are connected in parallel?

I built a simple circuit consisting of two battery holders each including x2 1.5 V batteries, a slide switch, a LED and a 100 ohm resistor. The current I measured with a multimeter when the two ...
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0answers
37 views

Dometic cfx50w fridge - how to choose small DIY battery setup [duplicate]

I am looking for some help to understand what kind of battery could power a Dometic cfx50w 12/24/120V compressor fridge, while on-the-go. Here are the electrical specifications: Input voltage (AC) ...
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2answers
101 views

Replace mains 12v power-supply with 12v battery

A Yamaha digital piano is powered by a mains power-supply. The power-supply states the following input/output values: INPUT 100-240V~50/60Hz 0.5A OUTPUT 12V === 1.5A (Where I have written === there ...
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2answers
61 views

Battery pack solution for a 5V 500mA project

My project contains: Raspberry Pi Zero W Arduino ProMicro 10 5V RGB LEDs I2S amp that drives a 4Ω 3W speaker Currently I am powering it from a 10000mAh USB power bank. But in order to avoid brutal ...
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3answers
108 views

battery management protection component

I have been looking at a lot at Battery management system/protection circuits lately and there are components that I can't identify. Can anyone tell what is the name and function of the component I ...
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1answer
429 views

TP4056 and Lipo batteries

I have several 3.7V 1800mah and 700mah Lipo batteries that also have the 8205A MOSFET and DW01a chips mounted to the top. I've seen the two types of TP4056 boards (one with these two chips for lipo ...
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5answers
15k views

Why do drones use Li-Po instead of Li-Ion? [closed]

According to every source I've found the only advantage of Li-Po is their shape, but they are more expensive, have lower energy density and are more dangerous compared to Li-Ion. Why do drones use Li-...
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1answer
267 views

PMIC Battery charger and power path

I was looking for a PMIC with battery charger and built-in power path when I came across one of TI's new chip. BQ25601 http://www.ti.com/product/BQ25601. while I was trying its performance and doing ...
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1answer
27 views

Sensor to charge battery

I'm doing a project here. I'm designing my own generator using genset and motor to produce 12V of electricity. The main objective of my project is to produce a 12V from the generator. This 12V is ...
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4answers
96 views

How is power consumption from a battery controlled?

Sorry if this is a amateur question, but I don't understand how to control power from a battery. If you just wire it up to the load, it seems it will draw the fastest possible current, possibly ...
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0answers
19 views

Battery draining SLA 55ah [closed]

Hi I use 2 x 55ah lead acid batteries on single ride on golf buggys. 1000w motor. Past 12 months having batreries failing in around 4 months. Tested by drop load and both are around 40 to 50%. What ...
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1answer
44 views

Lead Acid Battery [closed]

I have lead Acid Battery which I found in my old stuff I took it out and check the readings with my multimeter the battery is completely dead so I opened the caps of the battery and put few drops of ...
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1answer
24 views

Li-ion custom protection circuit module (PCM) design and de-rating

I am designing a custom PCM (protection circuit module) for Li-ion cells provided by a supplier ( they offer PCMs but they do not meet our RF immunity spec ). The supplier-provided PCMs have a charge /...
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1answer
116 views

Building a Huge 18650 Battery Powerbank DIY [closed]

I know there are a lot of threads about this topic already, but I still have some questions about it. Anyways, I am thinking about making a 50-80 thousand mAh power bank depending on the batteries and ...
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1answer
1k views

Batteries connection to load and charging port for DIY bluetooth speaker

it is my first question here, so I hope to write this in the right way. What I'm trying to accomplish is buidling a battery powered bluetooth speaker. In order to do it I'm using the following parts: ...
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3answers
806 views

How to measure 6S LIPO battery juice in percentage from Raspberry Pi?

I've got a Raspberry Pi and I want to use it to measure the percentage of charge which a 6S LIPO battery pack has left which I then send to a server over the internet. I assumed there would be easy ...
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0answers
63 views

What is the acceleration tolerance of 18650 (Li-ion) batteries [closed]

I'm planning a device where the battery pack would be in pretty constant (1-axis) back/forth movement (intending to use the battery pack's mass as a balancing mass). How much G forces can I expect ...
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5answers
3k views

Why is the battery jumpered to a resistor in this schematic?

I am looking at a schematic for the wifi D1 mini data logger shield that I'm using right now. In this part of the schematic, a coin cell battery powers the RTC. I see R5 is jumpered across the ...
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0answers
45 views

Help needed with weird battery behavior at first charge

I bought 28 new 18650 LG INR18650MH1 from NKON and built a battery pack for my ebike in 7S4P configuration like it's shown in this GreatScott's video: https://www.youtube.com/watch?v=b2sBhDxmPmA All ...
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3answers
60 views

Possible to measure output of each battery in a battery bank?

I've been working on a small project to add electrical to my utility trailer. I have two 12V 20Ah lead acid batteries wired in parallel for running a mix of lights, a winch, cameras, a ventilation ...
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3answers
961 views

Beginner question regarding batteries' voltage/amperage

I want to use two batteries rated 6v, 4A with a 9v,1A device. I figured that connecting the batteries in parallel would give 12v and connecting a 3ohm resistor in series with the device would give the ...
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2answers
374 views

How does current flow in this path when all points are at the same potential?

If the potentials at points A,B,C .. etc are at the same potential as the battery wrt the ground, how does current flow then? I'm lacking something fundamentally so it would be helpful if someone ...
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1answer
59 views

10 Amp Current Limit

I have a 28VDC, high current supply (constant voltage) that is required to charge an emergency power supply. These EPS internals are rated at 15 amps max input current, however, it’s stipulated that ...
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2answers
66 views

How to heat an e-cigaret coil

I am working on making my own "mod" for an e-cigaret (A mod is the device that controls when and how much the coil is heated up to) I have read a lot about it during the last couple of days, so i ...
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1answer
148 views

Replacing a Lipo phone battery with a li-ion battery

Is it okay to replace my worn li-polymer 3.8v and 2200maH battery with a li-ion battery with 3.7v and same 2200maH capacity?Will the 0.1v be of any harm to the delicate electronics of the phone?
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0answers
32 views

SLA Battery Parallel Connection with PSU and Load

I'm designing an ON-Line UPS and I have some problems with battery charging. In this system I have an inverter and the power supply which can deliver the power required by the inverter, and two 100Ah ...
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0answers
60 views

How can I power my Raspberry Pi 3 with Li-Po battery? [on hold]

Here is my setup: RPi 3 4x Brushless motors 4x ESC 3 Cell 11.1V Li-Po battery 16 channel 12 bit PWM driver Battery is connected to ESCs, and ESC's PWM wires are connected to the PWM driver. The PWM ...
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0answers
28 views

LCD Dimmer with Variable Resistance Circuit

essentially I'm trying to make a very basic circuit where a 3.7 volt battery is wired to a liquid crystal display, (or LCD), and the brightness of said display is controlled by a pentiometer to ...
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0answers
43 views

Connecting batteries in parallel with different capacities

I have an old 24 V 455 Ah battery used to drive a hydraulic pump. I want to connect a 24 V 180 Ah battery in parallel to increase capacity. Both batteries are Lead Acid, both will be removed and ...
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1answer
98 views

Can multiple microinverters, connected in parallel to a single source, become unstable?

Just to get this out of the way, I realize that what I'm exploring is well outside the design specs for the hardware I'm using. Now that that's out of the way: I have a large lithium battery module ...
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1answer
539 views

4s4p Li-Ion battery pack charging

I've made a 16 cell battery with Li-ion 18650's salvaged from laptops in a 4s4p configuration at around 16.4V. I'm using it in a Bluetooth speaker I made with a TDA7492 Bluetooth audio board, and am ...
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2answers
63 views

Why my Battery Protection + Charging + Buck/Boost design doesn't work

Disclaimer: I am a total beginner in electronics, no professional degree whatsoever. I have designed the below 1 cell Li-ion battery protection/charging/buck-boost circuit and I've also designed the ...
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1answer
86 views

Factors to be considered while replacing dead cells with a new 18650 Li-Ion cell in a Laptop

I am currently using a Lenovo Z50-70 laptop. My battery condition is very poor and it lasts for only 20mins. So I decided to replace the dead cells inside the laptop battery on my own. My Laptop ...
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1answer
122 views

Does keeping a mobile phone plugged in increase its battery's lifetime?

As far as I understand, keeping a mobile phone plugged in would draw current from the source (i.e. an USB port) rather than from the battery. Therefore, the battery would not be used as long as the ...
0
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1answer
354 views

Whats a N (+,N,-) terminal on battery connection to UPS?

We have a 3 phase ABB powerline series in our site, and we are installing it. In connecting external batteries to the UPS, 4 terminals are given +,N,- and PE. I understand +,- and PE, but for what "N"...
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1answer
202 views

12 V 3.8 A water pump to 12 V 625CCA battery

Wanting to use car battery to power pump. Pump says it's 12 V 3.8 A, uses a 8 A fuse. Trying to sort out possible solar input needed to run pump but the numbers don't make sense. What size solar panel ...
0
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1answer
115 views

lithium coin cells, safe to completely cover? lightweight method to protect from the environment

I am trying to make equipment to measure temperature in small mammals, probably attached to a neck collar. The collar needs to be very lightweight (e.g. <3g total) so I am planning to use a ...
2
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2answers
70 views

Corroded PCB from Rechargeable NiMH battery

This NiMH battery began to leak battery acid onto the circuit board / PCB below it. Some of that acid ran down one of the wires connected to the battery and pooled up at the foot of the plug where it ...