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
41 views

Why has the XBOX360 controllers battery pack an integrated breaker contact

Everyone owning a XBOX360 with wireless controllers came across a phenomenon where older controllers were switching off randomly while playing or if they were moved too quickly. Me and everyone i know ...
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1answer
70 views

Electrical fly swatter harmful for baby [on hold]

I was using an electrical fly swatter zapping a bug but couldn't catch it. Then my 10 month old son touched the swatter while I was holding it, but not pressing the button, and got zapped. I assume ...
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1answer
51 views

Can Lead Acid and Lipo batteries be connected together to achieve higher resulting current?

I have a lead acid battery setup which has 3x12V 12Ah batteries connected in series resulting in 36V 12Ah output. I also have 3 LIPO batteries (1x11.1V 3300mAh, 1x11.1V 3000mAh and 1x12.6V 4500mAh). ...
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2answers
44 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
76 views

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

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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2answers
58 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 ...
0
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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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3answers
96 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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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 ...
0
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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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7answers
766 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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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 ...
0
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1answer
26 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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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 ...
1
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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 ...
19
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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 ...
0
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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 ...
1
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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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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 ...
0
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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 ...
0
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2answers
67 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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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 ...
1
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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 ...
0
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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 ...
1
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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 ...
3
votes
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 ...
7
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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 ...
0
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0answers
14 views

Charging and monitoring LiPo battery on docking station

How can I charge a LiPo battery (4 cells) without the "classical Lipo Balance Charger". Also, is it possible to monitor the battery level from, let's say a Raspberry Pi?(Using the 4 pins that are ...
0
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2answers
103 views

Is there a way to trade off amperage for voltage? [closed]

I was planning on buying a motorcycle battery or some other large battery to charge my laptop, but most of the batteries I found are 12v or lower, and I need around 20v to charge my laptop. Is there a ...
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0answers
40 views

When to monitor battery capacity

While other good answers have stated why discharging a 12V lead acid battery is hurtful to it, I seem to be unable to find how you should monitor it. Assuming I want to stop drawing current from the ...
0
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1answer
52 views

18650 pack building - is it better to have similar batch or similar capacity?

I'm gonna build battery packs. I have quite a lot of experience with 18650 Li-ion cells, but there's one thing I still don't know. I will buy CCA 100 new cells from seller (for example LGEBHE21865). ...
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0answers
39 views

Can I use a “battery charge controller” as a “voltage detector relay”?

(I'm very new to electronics/electricity.) I'm currently using a complex ACS712 / Arduino / Raspberry Pi to activate a relay when battery is above 13.8V volts. (See 12V - How to activate an electric ...
-1
votes
1answer
95 views

How many batteries do I need to power a 910mm long LED strip? If I want it to last 30 days, 14 days or at-least 7 days? [closed]

I'm using a LED strip that is roughly 910mm. The LED strip is a OEM 12V LED strip, running at 5W per meter. My project is a LED strip that is suppose to be powered by batteries, this is to be used in ...
0
votes
1answer
98 views

Battery type Identification Request [closed]

I am trying to replace the battery of a rechargeable LED torch, but it looks different than most others that I have seen. I was wondering if anyone can help me identify it, so I can try to find a ...
0
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0answers
43 views

What causes batteries to explode [migrated]

I have a 2014 Hyundai Elantra, that i have owned for a little over a year now. It has been very well maintained in the time that i have had it. The other day after i finished pumping my gas, i got ...
1
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2answers
117 views

How to build an electric rat trap / deterrent

I am looking to build an electric rat trap that acts like an electric fence, one that that can deter or block rats from climbing up a tree. Not interested in killing them. I have a large orange tree ...
0
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0answers
41 views

Can a capacitor be used to power a project? [duplicate]

Can a capacitor be used to independently power a project for a reasonable length of time? For example is there a capacitor when completely charged that could roughly double for a CR2032 battery so ...
1
vote
1answer
63 views

Does a CR2032 take damage when connected to a 5V rail?

I've seen applications (Nintendo game cartridges, for example) that uses a coin cell battery for backup power to some RAM-chips (for savegames). When the ordinary 5V is gone, the battery takes over ...
0
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0answers
38 views

Creating mobile LED projects with LED strips, USB, and an 8xAA battery pack

I'm trying to make some LED clothing. I'm planning on buying some LED strips, which require a 12V power supply. I plan on buying some battery packs for the power source. To link the power source to ...
2
votes
2answers
75 views

Emergency Shutdown

I am designing a system that is always on. It is powered via POE and it is doing some task that is not mission critical. The system has an embedded system inside that runs Linux. The storage etc are ...
0
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1answer
71 views

Li-ion Swollen battery dangerous or not?

I have a Wifi AP and its Li-ion battery has swollen so much that its cover cannot be put in place over it now. Its working but its backup time has reduced to 20%. I cannot put on the battery cover ...
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2answers
144 views

Do Duracell AAA batteries have internal short circuit detection?

I was shorting a Duracell AAA battery in a SAFE area with proper precautions. After 2 minutes I disconnected the circuit and measured the voltage, it dropped from 2.8V to 2.6V and the battery was hot. ...
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0answers
47 views

Is there a circuit that conserves energy of multiple power sources?

Say I have several batteries. To start all the batteries are "dormant"; there is no current running through them. Starting with the first battery it runs current through it until it dies, wherein the ...
0
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1answer
57 views

How to optimize the life of a Lead Acid deep cycle battery?

I have a lead-acid battery : HANKOOK DC24MF DEEP CYCLE 80Ah 12V. In hope of extended this battery's life, I was thinking about buying an identical one and put it in parallel. This way by using "80Ah",...
0
votes
1answer
39 views

Undervolting BLDC motor on electric bicycle

I plan to build a DIY electric bicycle using a standard geared BLDC hub motor (36V and 250W rated, 500W peak). To get 36V rated battery, at least 10 Li-ION 18650 cells are to be connected in series (...
0
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0answers
42 views

Could I use my PV inverter at night, feeding it from battery power? What would be needed?

First off, this is pretty much just a thought-experiment! I don't plan on actually going through with this as I'm sure it would void any warranty I have on my installation. Also, I'm totally ...
-1
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2answers
84 views

Non-equal batteries discharge in parallel connection

My friend and I have an argument and I want to ask the community to say who is right and who is wrong in their beliefs, and explain it with formulas and laws (if possible). We have two different Li-...