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
20 views

optimal mAH 18650 cell required for laptop

Good day I will be replacing my laptop batteries with 18650's, however my question is as follows. Stats : Battery pack = 6 cell (18650 type Li-ion battery) Time : +/- 3-5 Hours if memory serves. ...
-4
votes
0answers
15 views

2 number of 5W LED DC Bulbs and want to chrge my mobile on Solar with a Battery back of 10 Hours . [on hold]

I want to carry a simple solar panel system when i go in forest. It should run Two 5W LED DC bulbs and a Mobile Charger , with a battery back up of 6 Hours to 10 hours, Can you suggest Panel size ...
0
votes
2answers
60 views

Battery Charging circuit problem

I want to charge a 3.7v battery of 3000mAh. I am using the battery charging circuit based LM317(from internet source) I have connected the components by supplying input voltage of 9v and while ...
2
votes
0answers
39 views

Lead-Acid Battery Desulfation Circuit Design:

I'm seeking ideas for making a pulsing lead-acid desulfation circuit design. Several circuit designs are available via Google image search, however, I'm hoping to get some help here to design a ...
0
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1answer
51 views

Is it possible to convert the battery power supply in old devices?

I have an old Yamaha keyboard/synthesizer lying around that I'd like to start using with battery power. However, it takes 6xC (1.5v) batteries to power the thing up. My question is, is it possible to ...
-4
votes
1answer
95 views

Why happen this? [on hold]

I have a brushless DC fan that work from 18 to 28 volts. I'm trying to running it with 4 18650 batteries in parallel. The batteries are connected to a cheap charger module that use a tp4056 IC. The ...
0
votes
2answers
71 views

Onboard charging system for hybrid electric tractor

I’m in the process of converting a Cub Cadet SLT1554 from gas to a hybrid-electric tractor using a Motenergy ME0909 PMDC Motor. See description/specifications below: Motenergy ME9090 PMDC Motor ...
0
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0answers
64 views

How can I make joule thief battery last longer

I assambled a simple joule thief circuit powered by 1 AA battery to light up just 1 LED. I read that with that kind of circuit you may drain down the battery to light up an LED for about a week. But ...
-4
votes
2answers
38 views

Effect of using 12v, 75A battery to power a pannel with initial 12v 10A battery.

I want to use a 12V 75A battery to power a fan with initial battery of 12v 7A. what's the effect on the fan?
-5
votes
0answers
34 views

i want to heat up NiChromide 80 40awg with a dc power supply need help plz [on hold]

Ok so UK what I want to heat up. Ive been doing some research and ive read that the amps is how hot the wire get, and the volts is how much of it will heat it. Well I want to heat up about 3 inch's of ...
4
votes
1answer
37 views

Do cold battery capacity de-ratings apply at low currents?

I've read that NiMH and Lithium chemistries will only supply around half of their rated capacity when used at low temperatures (say around 0 degrees C). Many sources also mention an increase in ...
0
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2answers
41 views

Boost +12v from ATX PSU to ~13.5-14.5v

I understand that what I am doing requires the utmost care and that numerous precautions should be taken in completing a project like this. Out of necessity, I am going to fashion a car battery ...
0
votes
1answer
44 views

Need to identify this cable

I recently bought this product from Amazon, but need to get a splitter for the 20V output. I need to know what to look for though, and cannot identify what kind of cable this is / what to search for. ...
-3
votes
2answers
45 views

What happens when the battery is being charged? [on hold]

Do the electrons move back to the negative terminal?
0
votes
0answers
55 views

State of Charge instead of Ah?

My Goal is to monitor the battery's level. My first idea was to build a circuit that would detect its Ah. But I have not come to a solution that is that simple. So I have researched and found out ...
0
votes
1answer
34 views

Portable power supply for over 300 ws2812 LEDs (similar to youtube video)

I have an idea fro a project which requires a few hundred ws2812 LEDs to be powered using relatively small battery which can be carried. I was wondering how you could power over 300 ws2812 LEDs ...
1
vote
2answers
40 views

Li-ion swappable 18650 in parallel - preventing mixing charged&discharged cells

I'm designing a device that has 6 18650 elements (all parallel) in holders, made so that the end user will be able to pop out the batteries when they're discharged and plug in a set of new batteries. ...
-1
votes
0answers
51 views

Powering an always-on Arduino

I need help designing a circuit to power my Arduino. The Arduino has to always be on(or on as much as possible), and my plan is to use a solar panel and two 3.7v rechargeable batteries to power it. ...
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0answers
28 views

Is my Pico Hydro generator to battery setup correct? [on hold]

Do I still need a voltage controller? *My water pressure is controllable. I am using this kind of generator. Thanks in advance!
1
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2answers
35 views

LiPo/Li-Ion Cells in series max end-to-end voltage

I have wondered how many cells can be connected in series before issues may arise. I also wonder what specifications on the tech data sheet would allow you to decide which batteries are best for high ...
2
votes
1answer
371 views

Trying to understand Battery Chargers

I just started studying about batteries and battery chargers. I have this simple query so please help me out. I am trying to charge my 3000mah li-ion battery. The battery voltage is around 3.6v and ...
0
votes
2answers
81 views

heating a 5 ohm resistance with a 9V Battery

Hi I am working on a project which involves heating a resistor with a 9v battery. I am heating resistance because I want to increase the temperature of a temperature sensor so that I can do something ...
0
votes
1answer
33 views

Battery voltage increasing while measuring (NiMH)

I was going through conditioning for a NiMH battery pack (12 x 1.2V, 1500mAh cell) and decided to check the cell voltages. I noticed that the measured voltage, with a multimeter, increased over time. ...
3
votes
1answer
84 views

What is a good way of estimating how long a battery will last for powering up a microcontroller

I know this is going to be a broad question, but I'm looking for a broad answer that can get me a ballpark figure. When building a board with microcontroller, what's a good way to estimate how long a ...
0
votes
3answers
82 views

Car battery capacity in colder countries

The capacity of the battery is affected when the temperature drops, particularly Lead-acid batteries. So how in cold countries this situation is solved. In this PDF about automotive batteries at low ...
0
votes
1answer
33 views

Battery voltage isolated monitoring on Microcontroller

Is it safe to directly measure high capacity battery (100 Ah to 300 Ah) voltage with Microcontroller's Analog to Digital Converter (ADC)? Would it be enough to use just a simple voltage divider to do ...
-4
votes
1answer
65 views

What if i charge a battery with low ampere.? [closed]

Assuming we have a mobile battery and a charger which has less ampere than the original one. Is it damage the battery? i am asking for just curiosity e.g charging a battery with a universal charger ...
1
vote
3answers
85 views

How do microcontrollers (MSP430G2452/G2553 specifically) behave when the battery runs low?

In the event I decide not to monitor the battery (see below), I'd like to know how microcontrollers behave when battery life is low - specifically the MSP430G2553/2452. Do they reach a point and stop, ...
0
votes
1answer
39 views

current flow from positive to positive between batteries?

If you have two batteries with different voltages, let's 12 and 9 volts and you connect the negative terminals while you put a LED or whatever between the positive terminals, there will be current ...
2
votes
4answers
95 views

Do I need a galvanically isolated step-down DC-DC converter to power my digital electronic from a battery pack that powers also the electrical motor?

I have a battery pack with lithium ion cells. The battery pack has a maximal voltage of 84V (it goes from 84V to ~50V -> depending about the current state of charge). I use this battery pack to ...
0
votes
1answer
41 views

How to calculate how much current can lithium battery provide?

I need to know how much current can produce battery below? And how to increse current and voltage with 2 batteries like this below? Here are some details: ...
2
votes
1answer
130 views

Questions about Li-ion battery charger and battery monitor chips

I want to build a system powered by 14.8v Li-po battery pack or mains power (selectable power path). When the mains adapter is connected, the battery will be charged and the system will be powered ...
-3
votes
0answers
121 views

charging two 18650's with solar panels and usb charger [closed]

I want to charge my phone using some batteries charged by solar panels. I was told that I could connect a 5v usb charger too, but i don't know how I should connect it. how should i connect it? (the ...
-3
votes
1answer
95 views

What is the use of the 0.1Ohm Sense Resistor in Battery Charger

In the below circuit, can someone please point out the use of the 100m Ohm resistor? Can i replace it with a 0Ohm Resistor?
0
votes
1answer
46 views

How do electrons flow in a closed circuit?

So basically I was doing a presentation on batteries and how they work to power a connected device such as a bulb or a torch. While researching this question popped up in my mind. The electrons flow ...
0
votes
1answer
26 views

Using other Lithium based batteries

My question pertains to different types of the Li-ion batteries currently available. ...
0
votes
1answer
32 views

Rc car, power supply instead of alkaline battery?

I have an RC car which works with 8 AA alkaline batteries, which make a total of 12 volts. I want to replace the battery with a 12v 2A power supply (batteries cost away too much...) Do you think the ...
0
votes
2answers
70 views

Monitoring Lithium Polymer Battery Voltage from Microcontroller

I am working on a project in which a microcontroller (specifically an RFduino) is powered by a LiPo battery and the microcontroller needs to monitor the voltage of the LiPo. Five of the RFduino pins ...
3
votes
0answers
63 views

Convert SLA laptop battery to NIMH

I have an old laptop that uses a SLA Battery and I'm wondering what sort of circuit would be need to convert the charging circuit for NiMH Cells. Many manufacturers were able to do some time ago but ...
2
votes
1answer
60 views

Can I charge a lead acid battery with a lithium ion battery?

I am asking specifically about automotive 12V lead acid batteries but I suppose the principles may be universal. If I were to connect a fully charged 15V Li-ion battery to a discharged 12V lead acid ...
2
votes
1answer
43 views

Battery Pack Management: need to balance during discharge?

I'm looking into the fault detection and monitoring subsystem of out unmanned vehicles (airborne and ground-based) batteries. We employ LiPo-battery packs of various configurations which are charged ...
2
votes
1answer
32 views

Solar Power Watts/Volts/Amps

I have a 12v battery that is rated at 220ah. I have solar panels rated at 500 watts total. I'm using a MPPT charge controller rated for 12/24 volts I only have a rudimentary understanding of ...
1
vote
0answers
65 views

Why do batteries have a short lifetime despite having no moving parts?

Chemical batteries do not seem to have any moving parts, but seem to have a rather short lifetime anyway. Why is this? The only reason I can think of is electrolyte leaking, but I have never noticed a ...
0
votes
2answers
83 views

How to place “Power On” indicator lights?

I'm working on a replacement board for an old system. I have two terminal blocks. Terminal Block 1 (left) is the input from the power supply to the board. This is the primary power supply to the ...
-1
votes
1answer
69 views

Solar panel subsystem project

I am trying to build a subsystem for a project that I am undertaking in university. An overview of the subsystem can be seen in the attached image. The only difference from my subsystem and the one ...
1
vote
1answer
62 views

Charging phone battery from DC supply

I am planning a project very similar to the one seen in the following gallery. (http://imgur.com/a/G7iww) I like the idea of having my phone plugged into the same unit for charging. My only concern is ...
-1
votes
2answers
49 views

What does battery charger's current rating mean? [duplicate]

I am basically a software engineer but have some interest in electronics so this is probably a very basic question. I understand theoretically a battery or power source can provide as much current as ...
1
vote
1answer
63 views

Can i double max current drawn, putting batteries in parallel?

Im dimensioning a quadcopter,and from my math, everything will draw a maximum load of 58-63 A. I need to choose Lipo batteries that can handle that current draw. From what I know: Max current: ...
1
vote
2answers
285 views

TL431 Low battery cut-off

Good morning Could somebody please explain the operation of the attached diagram to me? The circuit was proposed here and here as a low voltage cut-off circuit, which switches off the MOSFET when ...
0
votes
1answer
53 views

Charging batteries while powering device

This may be somewhat of a common question although there are some specific challenges in this one. I have a bluetooth speaker which no longer charges its internal Li-ion cell. Using a new cell I can ...