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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74 views

What's the name for this connector?

Recently bought 3.7mAH li-ion batteries on ebay (it's labelled for use with RC toys, but I'm using it for DIY projects). Will need to buy the female adapter. Here are some pics: EDIT: Well then, ...
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0answers
25 views

Can a joule thief circuit be made to both boost or buck an input voltage?

In the normal run of things I would use a 555 or something similar to generate a PWM signal as the base for my power supply. The caveat is that for my application I need continuous operation from an ...
-4
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0answers
21 views

auto shut down of a 9v carbon-zinc battery [duplicate]

i feel voltage drop of a 9v battery for a continuous use nearly 30 minute for 35ma load.but,after 5 minute resting ,battery regains its voltage and performs well . so,i would like to choose auto shut ...
-5
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0answers
26 views

battery charger design [on hold]

Selected battery is 10 hr rating to 1.85v /cell of 64AH cell type is YAP17. Number cells selected is 110. FCBC required is 248V (nominal)(Float 2.25VPC) (Boost 2.25VPC) calculation required for ...
-4
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0answers
27 views

9v carbon -zinc battery voltage drop and regain its original state [duplicate]

i am using 9v carbon -zinc battery with 35ma load,including regulator and other circuitry. its working well for first 20 minutes,after battery voltage drop less than 6v and entire system will shut ...
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1answer
44 views

Cellphone batteries used for projects

I am building a project involving a raspberry pi. It is known that the RPi runs around an average of 700mA of current and our project would probably need a little over than 1A of current due to ...
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2answers
122 views

9v battery voltage drop and regain its voltage

as a part of my project , i have to develop +5v from an 9v carbon-zinc battery with 7805 regulator.it is given to microcontroller and some other circuitries .it consumes nearly 40ma. but,the problem ...
0
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1answer
64 views

Ratio Between Voltage and Charge

Is there a ratio between the voltage and charge of a battery? I mean, the voltage falls slowly while the charge is consumed? Or occurs a sudden drop of voltage when the charge is at the end?
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1answer
44 views

Some problems with my dump load controller

The requirement is an automatic dump load controller; for balancing lead acid or lifo batteries. While the input voltage is above 1.75V the circuit should dump 10A into the load continuously. ...
0
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1answer
19 views

Calculating Appliance Power Usage from Deep Cycle Battery

I want to figure out a formula for calculating appliance usage from a deep cycle battery and 120v power inverter. I own and operate a hot dog cart. I wish to add an electric grill/griddle to the cart ...
2
votes
1answer
35 views

Float charging AGMs while under load

I am an amateur radio operator, and often provide communications for events and train/prepare for communications in the event of a disaster (earthquake, flood, etc.). As part of this, I'm building a ...
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0answers
35 views

Automatic Battery Charger Circuit. Not getting proper output

i have tried to make a circuit from electronics hub. but the LEDs in the circuit is not glowing. But the circuit is ok charging is doing well. Any problem with this circuit ? please help ?
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1answer
55 views

Increase Laptop Battery life [closed]

How good is it to use laptop without battery, by giving power directly like in a desktop? I want to decrease the number of charging/discharging cycles of my battery and thus improve its life?
2
votes
1answer
70 views

How do battery powered thermostats with LCD screens run for so long?

My thermostat runs on batteries but it has an LCD, similar to ...
3
votes
3answers
712 views

I want to replace a car dash cam battery with a capacitor

My car dash cam (G1W) has a weak battery. When it dies the camera will not function at all. I have already replaced it once. The original battery was 200ma, but I found a 320ma one that would fit. It ...
1
vote
3answers
56 views

Switching between two sources of power to a battery?

This is the simplified system: a battery (3.6 V, 2450 mAH, NiMH) a solar panel (max 5.2 V, 157 mA) a wall charger (5 V, 2100 mA). The battery is constantly being drained, but very slowly (85 mWh ...
1
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1answer
37 views

Charging NiMH batteries with 1W solar panel, charge controller needed?

I want to know if a charge controller would still be needed despite the solar panel never outputting more than C/10 of current to the battery. This is a follow-up about my question here. The solar ...
3
votes
2answers
493 views

How long will a battery last based on these numbers

Hi I asked this question on SU but seemed to have gotten into a bit of trouble, I was referenced here. I am getting into doing hardware build based on things like microcontrollers and ...
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2answers
57 views

Voltage drop when measuring battery capacity

I'm trying to build a battery capacity tester for Li-ion batteries. I made this schematic using Arduino: While bush button is not triggered arduino only shows battery voltage on Serial & when ...
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4answers
107 views

Replacing 18650 cells in laptop battery with greater capacity ones

My laptop battery died and I can't find a replacement (old laptop) so I'm going to need to replace myself the 18650 cells it has. It is an 8-cell battery (a series of 4 banks of 2), making the whole ...
0
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0answers
55 views

How best to power down an Arduino for ~5 minutes at a time? [migrated]

Reading over the datasheet it appears the longest it can shutdown for is 8s so should I just keep a counter in the loop method that checks if it's run 38 times and then execute the code I want? Would ...
0
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0answers
28 views

Best Battery for saving small charge Overtime

Working on a project that requires the use of piezoelectric effect. It is true that the charge per compression can be very small. Trying to figure out what the ...
1
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1answer
40 views

Discharge constant 2A-3A current from a battery

I am supposed to drain a constant current of 2A or 3A from a battery (most probably a NiMH battery). What could be a possible way to do that ? Purpose of doing it is to calculate the battery's Energy ...
0
votes
1answer
43 views

Using a development board to charge a lipo battery [closed]

Ok, I'm not specialist in electronic but just enthousiast. I'm searching a solution to charge lipo battery in-board (to build tablet with a micro computer like Raspberry Pi) So, I have seen this ...
0
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3answers
94 views

why does the model s use multiple batteries?

The Tesla Model S and NASA's Robonaut both use a battery pack that consists of an array of hundreds of battery cells. Why don't the engineers just create one giant cell?
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1answer
24 views

LM3914 4S lithium polymer meter

I need help creating an LM3914 voltage meter (in bar mode). I looked at the datasheet and understand how to create a standard voltmeter (0-5V for example). However, what I need is an expanded range ...
0
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1answer
62 views

What is the net charge held in a battery?

I assume that the net charge held in a battery is always 0. I.e. the total charge held in the positive terminal of the battery is always equal to the total charge held in the negative terminal. Is ...
0
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0answers
46 views

Solar panel - voltage regulator

I am contemplating the possibility to run a trolling motor (to push my canoe) with a 250W solar panel. Electrical Specifications: Peak power: 250 W (minus 0, plus 5W Tolerance!) Optimum operating ...
1
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1answer
131 views

replace battery with capacitor

I am looking for a small form factor capacitor that is capable of 12V at 500 mA for approx 2 seconds. This is to open a small 12vdc air solenoid that is under about 100PSI of pressure for just 2 ...
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0answers
56 views

Battery Charger

I am working in a industry where we have a battery bank connected with a battery charger in usually in charging mode but whenever black out occurs at that time by using battery we can provide a power ...
0
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1answer
41 views

Current output of a solar panel when connected to battery and load

I am trying to build a microgrid (final year project) where a 100-250 W 48V solar array will charge a 24V battery bank and a couple of 24V loads (40W lights, 60W fan). Batteries used (7 of this in ...
0
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1answer
42 views

How to maintain equal discharging on batteries

I am currently building a robot that has one 12V battery for each drive motor. The system was originally setup so that the two motor/motorcontroller/battery systems were completely separate. After ...
0
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1answer
44 views

GSM Battery/Amperage Usage

I have a general question. I have a GSM module (adh8066 link to data sheet below) that I purchased from sparkfun. In the data sheet, it states that in tx mode, the module can draw up to 2 amps @ ...
0
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4answers
153 views

With today's technology, is it possible to charge a battery over 100% without exploding? [closed]

We all know who Iron Man is. Hollywood makes a nice job to make him look like a genious in electronic. However, there is a scene where his suit charges it's batteries to 475%. There is another ...
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2answers
41 views

NIMH Battery excedes charge limit when plugged into Tenergy Charger? [closed]

I recently purchased a NIMH Battery (5000MAH, 7.2V) and when I plugged it into my Tenergy Battery Charger I set the charge rate to 5amps. After watching it for several minutes the "voltage" jumped to ...
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3answers
189 views

How long will this appliance run from a battery?

How long can I run a water pump which requires 12V and 50W from a 12V, 40Ah, 400A car battery? Can you explain how this was calculated?
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2answers
66 views

switch OpAmp down to minimize power consumption

I'm currently designing a board which senses some stuff. The board is powered using a 6V lithium battery. According to my sensor+OpAmp logic I need to split the voltage into +/-3V. The circuitry to ...
0
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1answer
61 views

12v lead acid battery charged directly by 17v solar panel

I don't have a charge controller, I wanna know if I can directly connect the solar panel (17v max when directly hit by sun light 1.5W) to the 12v battery? Someone in arduino group on facebook said ...
0
votes
1answer
72 views

Powering board and charging coin cell at the same time

Here is what I have: 2035 coin cell battery ATmega328 I want to have an ability to plug micro/mini usb cord and power circuit from usb and charge battery. Circuit has extremely low power ...
0
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1answer
91 views

Can I use a 11.1V LiPo directly on 12V electronics?

I'm considering using a TS351 video transmitter (6.5-12V) and a 700TVL camera (8-13V) on an RC aircraft where a 3S LiPo battery (11.1V) is used as the main power source. The rest of the electronics on ...
-1
votes
1answer
49 views

Fast rising voltage on lead acid battery while charging

i have a couple of 12V sealed lead-acid batteries.Whitch i have to charge.But when i hook one of them on the charger at 12V/1A (the battery is 10Ah) the voltage from 12.6 drasticly increases up to 14V ...
-1
votes
0answers
5 views

what can happen to car and battery when a battery charger was left on with only black terminal connected? [migrated]

IV asked many people why the red cable must be connected before the black, and why,(IV been told) it can do damage to your car and Battery if this isn't done properly. my reason for taking the rout ...
2
votes
1answer
87 views

Choosing a linear regulator vs. switching regulator for low-power application?

I have a 3.6 V battery that I want to regulate down to 3.3 V and 1.8 V rails. I have already asked about the configuration of the two rails here. My question here however is whether I should use a ...
0
votes
2answers
74 views

How to regulate a 3.6 V battery to two power rails (3.3 V and 1.8 V)?

I have a 3.6 V battery from which I need two voltage rails, one that is 3.3 V and one that is 1.8 V. How should I design this circuit such that it is the most power efficient? Here is what I was ...
2
votes
1answer
129 views

Using a capacitor to keep circuit powered for 1s after battery disconnected?

I am planning on using a 3.3V GPS module which draws 22mA. The module has a requirement that a shutdown sequence be initiated 1s before power is removed from the IC. If power is removed without ...
0
votes
3answers
91 views

Why does a simple circuit drain a battery slowly?

OK, so if you directly connect the two terminals of a battery, there is very little resistance in the circuit and you will drain the battery very quickly. However if you have a very simple circuit, ...
3
votes
1answer
38 views

How to select a DC cable connection type based on current?

I have a battery and DC-DC converter solution that I've ordered. The solution will output 20A continuously at 5V, and will sometimes pulse up to 30A for durations up to 10 seconds. I believe voltage ...
4
votes
2answers
614 views

What battery to use?

Hi im a newbie when it comes to electronics, I want to design a robot similar to this: http://www.me.berkeley.edu/ME102B/Past_Proj/f09/1%20BearClaw%20Tennis%20Ball%20Collector/design.php The thing ...
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0answers
20 views

how to determine length of nichrome wire in respect to temperature [duplicate]

If anyone of you help me in finding specification(awg of nichrome wire required) for a 2 m nichrome wire to heat up to 65 degree Celsius .Voltage applied is 12 v.I want to use it by coiling it to ...
-1
votes
2answers
48 views

How can I connect a phone battery to TV remote control? [closed]

I have an old tv with an IR remote control. It has become quite bothering for me to change the remote control's batteries every other week. I thought to myself why not connect a Chinese phone battery ...